Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic hugetlb support. |
Nadia Yvette Chambers | 6d49e35 | 2012-12-06 10:39:54 +0100 | [diff] [blame] | 3 | * (C) Nadia Yvette Chambers, April 2004 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | #include <linux/list.h> |
| 6 | #include <linux/init.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/mm.h> |
Alexey Dobriyan | e1759c2 | 2008-10-15 23:50:22 +0400 | [diff] [blame] | 9 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/sysctl.h> |
| 11 | #include <linux/highmem.h> |
Andrea Arcangeli | cddb8a5 | 2008-07-28 15:46:29 -0700 | [diff] [blame] | 12 | #include <linux/mmu_notifier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/nodemask.h> |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 14 | #include <linux/pagemap.h> |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 15 | #include <linux/mempolicy.h> |
Gideon Israel Dsouza | 3b32123 | 2014-04-07 15:37:26 -0700 | [diff] [blame] | 16 | #include <linux/compiler.h> |
Christoph Lameter | aea47ff | 2006-01-08 01:00:57 -0800 | [diff] [blame] | 17 | #include <linux/cpuset.h> |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 18 | #include <linux/mutex.h> |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 19 | #include <linux/bootmem.h> |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 20 | #include <linux/sysfs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 22 | #include <linux/rmap.h> |
Naoya Horiguchi | fd6a03e | 2010-05-28 09:29:21 +0900 | [diff] [blame] | 23 | #include <linux/swap.h> |
| 24 | #include <linux/swapops.h> |
Naoya Horiguchi | c8721bb | 2013-09-11 14:22:09 -0700 | [diff] [blame] | 25 | #include <linux/page-isolation.h> |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 26 | #include <linux/jhash.h> |
Linus Torvalds | d660668 | 2008-08-06 12:04:54 -0700 | [diff] [blame] | 27 | |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 28 | #include <asm/page.h> |
| 29 | #include <asm/pgtable.h> |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 30 | #include <asm/tlb.h> |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 31 | |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 32 | #include <linux/io.h> |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 33 | #include <linux/hugetlb.h> |
Aneesh Kumar K.V | 9dd540e | 2012-07-31 16:42:15 -0700 | [diff] [blame] | 34 | #include <linux/hugetlb_cgroup.h> |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 35 | #include <linux/node.h> |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 36 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Andrey Ryabinin | 753162c | 2015-02-10 14:11:36 -0800 | [diff] [blame] | 38 | int hugepages_treat_as_movable; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 39 | |
Aneesh Kumar K.V | c3f38a3 | 2012-07-31 16:42:10 -0700 | [diff] [blame] | 40 | int hugetlb_max_hstate __read_mostly; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 41 | unsigned int default_hstate_idx; |
| 42 | struct hstate hstates[HUGE_MAX_HSTATE]; |
| 43 | |
Jon Tollefson | 53ba51d | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 44 | __initdata LIST_HEAD(huge_boot_pages); |
| 45 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 46 | /* for command line parsing */ |
| 47 | static struct hstate * __initdata parsed_hstate; |
| 48 | static unsigned long __initdata default_hstate_max_huge_pages; |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 49 | static unsigned long __initdata default_hstate_size; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 50 | |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 51 | /* |
Naoya Horiguchi | 31caf66 | 2013-09-11 14:21:59 -0700 | [diff] [blame] | 52 | * Protects updates to hugepage_freelists, hugepage_activelist, nr_huge_pages, |
| 53 | * free_huge_pages, and surplus_huge_pages. |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 54 | */ |
Aneesh Kumar K.V | c3f38a3 | 2012-07-31 16:42:10 -0700 | [diff] [blame] | 55 | DEFINE_SPINLOCK(hugetlb_lock); |
Eric Paris | 0bd0f9f | 2005-11-21 21:32:28 -0800 | [diff] [blame] | 56 | |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 57 | /* |
| 58 | * Serializes faults on the same logical page. This is used to |
| 59 | * prevent spurious OOMs when the hugepage pool is fully utilized. |
| 60 | */ |
| 61 | static int num_fault_mutexes; |
| 62 | static struct mutex *htlb_fault_mutex_table ____cacheline_aligned_in_smp; |
| 63 | |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 64 | static inline void unlock_or_release_subpool(struct hugepage_subpool *spool) |
| 65 | { |
| 66 | bool free = (spool->count == 0) && (spool->used_hpages == 0); |
| 67 | |
| 68 | spin_unlock(&spool->lock); |
| 69 | |
| 70 | /* If no pages are used, and no other handles to the subpool |
| 71 | * remain, free the subpool the subpool remain */ |
| 72 | if (free) |
| 73 | kfree(spool); |
| 74 | } |
| 75 | |
| 76 | struct hugepage_subpool *hugepage_new_subpool(long nr_blocks) |
| 77 | { |
| 78 | struct hugepage_subpool *spool; |
| 79 | |
| 80 | spool = kmalloc(sizeof(*spool), GFP_KERNEL); |
| 81 | if (!spool) |
| 82 | return NULL; |
| 83 | |
| 84 | spin_lock_init(&spool->lock); |
| 85 | spool->count = 1; |
| 86 | spool->max_hpages = nr_blocks; |
| 87 | spool->used_hpages = 0; |
| 88 | |
| 89 | return spool; |
| 90 | } |
| 91 | |
| 92 | void hugepage_put_subpool(struct hugepage_subpool *spool) |
| 93 | { |
| 94 | spin_lock(&spool->lock); |
| 95 | BUG_ON(!spool->count); |
| 96 | spool->count--; |
| 97 | unlock_or_release_subpool(spool); |
| 98 | } |
| 99 | |
| 100 | static int hugepage_subpool_get_pages(struct hugepage_subpool *spool, |
| 101 | long delta) |
| 102 | { |
| 103 | int ret = 0; |
| 104 | |
| 105 | if (!spool) |
| 106 | return 0; |
| 107 | |
| 108 | spin_lock(&spool->lock); |
| 109 | if ((spool->used_hpages + delta) <= spool->max_hpages) { |
| 110 | spool->used_hpages += delta; |
| 111 | } else { |
| 112 | ret = -ENOMEM; |
| 113 | } |
| 114 | spin_unlock(&spool->lock); |
| 115 | |
| 116 | return ret; |
| 117 | } |
| 118 | |
| 119 | static void hugepage_subpool_put_pages(struct hugepage_subpool *spool, |
| 120 | long delta) |
| 121 | { |
| 122 | if (!spool) |
| 123 | return; |
| 124 | |
| 125 | spin_lock(&spool->lock); |
| 126 | spool->used_hpages -= delta; |
| 127 | /* If hugetlbfs_put_super couldn't free spool due to |
| 128 | * an outstanding quota reference, free it now. */ |
| 129 | unlock_or_release_subpool(spool); |
| 130 | } |
| 131 | |
| 132 | static inline struct hugepage_subpool *subpool_inode(struct inode *inode) |
| 133 | { |
| 134 | return HUGETLBFS_SB(inode->i_sb)->spool; |
| 135 | } |
| 136 | |
| 137 | static inline struct hugepage_subpool *subpool_vma(struct vm_area_struct *vma) |
| 138 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 139 | return subpool_inode(file_inode(vma->vm_file)); |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 142 | /* |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 143 | * Region tracking -- allows tracking of reservations and instantiated pages |
| 144 | * across the pages in a mapping. |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 145 | * |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 146 | * The region data structures are embedded into a resv_map and |
| 147 | * protected by a resv_map's lock |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 148 | */ |
| 149 | struct file_region { |
| 150 | struct list_head link; |
| 151 | long from; |
| 152 | long to; |
| 153 | }; |
| 154 | |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 155 | static long region_add(struct resv_map *resv, long f, long t) |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 156 | { |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 157 | struct list_head *head = &resv->regions; |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 158 | struct file_region *rg, *nrg, *trg; |
| 159 | |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 160 | spin_lock(&resv->lock); |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 161 | /* Locate the region we are either in or before. */ |
| 162 | list_for_each_entry(rg, head, link) |
| 163 | if (f <= rg->to) |
| 164 | break; |
| 165 | |
| 166 | /* Round our left edge to the current segment if it encloses us. */ |
| 167 | if (f > rg->from) |
| 168 | f = rg->from; |
| 169 | |
| 170 | /* Check for and consume any regions we now overlap with. */ |
| 171 | nrg = rg; |
| 172 | list_for_each_entry_safe(rg, trg, rg->link.prev, link) { |
| 173 | if (&rg->link == head) |
| 174 | break; |
| 175 | if (rg->from > t) |
| 176 | break; |
| 177 | |
| 178 | /* If this area reaches higher then extend our area to |
| 179 | * include it completely. If this is not the first area |
| 180 | * which we intend to reuse, free it. */ |
| 181 | if (rg->to > t) |
| 182 | t = rg->to; |
| 183 | if (rg != nrg) { |
| 184 | list_del(&rg->link); |
| 185 | kfree(rg); |
| 186 | } |
| 187 | } |
| 188 | nrg->from = f; |
| 189 | nrg->to = t; |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 190 | spin_unlock(&resv->lock); |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 191 | return 0; |
| 192 | } |
| 193 | |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 194 | static long region_chg(struct resv_map *resv, long f, long t) |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 195 | { |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 196 | struct list_head *head = &resv->regions; |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 197 | struct file_region *rg, *nrg = NULL; |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 198 | long chg = 0; |
| 199 | |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 200 | retry: |
| 201 | spin_lock(&resv->lock); |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 202 | /* Locate the region we are before or in. */ |
| 203 | list_for_each_entry(rg, head, link) |
| 204 | if (f <= rg->to) |
| 205 | break; |
| 206 | |
| 207 | /* If we are below the current region then a new region is required. |
| 208 | * Subtle, allocate a new region at the position but make it zero |
| 209 | * size such that we can guarantee to record the reservation. */ |
| 210 | if (&rg->link == head || t < rg->from) { |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 211 | if (!nrg) { |
| 212 | spin_unlock(&resv->lock); |
| 213 | nrg = kmalloc(sizeof(*nrg), GFP_KERNEL); |
| 214 | if (!nrg) |
| 215 | return -ENOMEM; |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 216 | |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 217 | nrg->from = f; |
| 218 | nrg->to = f; |
| 219 | INIT_LIST_HEAD(&nrg->link); |
| 220 | goto retry; |
| 221 | } |
| 222 | |
| 223 | list_add(&nrg->link, rg->link.prev); |
| 224 | chg = t - f; |
| 225 | goto out_nrg; |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | /* Round our left edge to the current segment if it encloses us. */ |
| 229 | if (f > rg->from) |
| 230 | f = rg->from; |
| 231 | chg = t - f; |
| 232 | |
| 233 | /* Check for and consume any regions we now overlap with. */ |
| 234 | list_for_each_entry(rg, rg->link.prev, link) { |
| 235 | if (&rg->link == head) |
| 236 | break; |
| 237 | if (rg->from > t) |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 238 | goto out; |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 239 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 240 | /* We overlap with this area, if it extends further than |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 241 | * us then we must extend ourselves. Account for its |
| 242 | * existing reservation. */ |
| 243 | if (rg->to > t) { |
| 244 | chg += rg->to - t; |
| 245 | t = rg->to; |
| 246 | } |
| 247 | chg -= rg->to - rg->from; |
| 248 | } |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 249 | |
| 250 | out: |
| 251 | spin_unlock(&resv->lock); |
| 252 | /* We already know we raced and no longer need the new region */ |
| 253 | kfree(nrg); |
| 254 | return chg; |
| 255 | out_nrg: |
| 256 | spin_unlock(&resv->lock); |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 257 | return chg; |
| 258 | } |
| 259 | |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 260 | static long region_truncate(struct resv_map *resv, long end) |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 261 | { |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 262 | struct list_head *head = &resv->regions; |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 263 | struct file_region *rg, *trg; |
| 264 | long chg = 0; |
| 265 | |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 266 | spin_lock(&resv->lock); |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 267 | /* Locate the region we are either in or before. */ |
| 268 | list_for_each_entry(rg, head, link) |
| 269 | if (end <= rg->to) |
| 270 | break; |
| 271 | if (&rg->link == head) |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 272 | goto out; |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 273 | |
| 274 | /* If we are in the middle of a region then adjust it. */ |
| 275 | if (end > rg->from) { |
| 276 | chg = rg->to - end; |
| 277 | rg->to = end; |
| 278 | rg = list_entry(rg->link.next, typeof(*rg), link); |
| 279 | } |
| 280 | |
| 281 | /* Drop any remaining regions. */ |
| 282 | list_for_each_entry_safe(rg, trg, rg->link.prev, link) { |
| 283 | if (&rg->link == head) |
| 284 | break; |
| 285 | chg += rg->to - rg->from; |
| 286 | list_del(&rg->link); |
| 287 | kfree(rg); |
| 288 | } |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 289 | |
| 290 | out: |
| 291 | spin_unlock(&resv->lock); |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 292 | return chg; |
| 293 | } |
| 294 | |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 295 | static long region_count(struct resv_map *resv, long f, long t) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 296 | { |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 297 | struct list_head *head = &resv->regions; |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 298 | struct file_region *rg; |
| 299 | long chg = 0; |
| 300 | |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 301 | spin_lock(&resv->lock); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 302 | /* Locate each segment we overlap with, and count that overlap. */ |
| 303 | list_for_each_entry(rg, head, link) { |
Wang Sheng-Hui | f2135a4 | 2012-05-29 15:06:17 -0700 | [diff] [blame] | 304 | long seg_from; |
| 305 | long seg_to; |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 306 | |
| 307 | if (rg->to <= f) |
| 308 | continue; |
| 309 | if (rg->from >= t) |
| 310 | break; |
| 311 | |
| 312 | seg_from = max(rg->from, f); |
| 313 | seg_to = min(rg->to, t); |
| 314 | |
| 315 | chg += seg_to - seg_from; |
| 316 | } |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 317 | spin_unlock(&resv->lock); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 318 | |
| 319 | return chg; |
| 320 | } |
| 321 | |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 322 | /* |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 323 | * Convert the address within this vma to the page offset within |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 324 | * the mapping, in pagecache page units; huge pages here. |
| 325 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 326 | static pgoff_t vma_hugecache_offset(struct hstate *h, |
| 327 | struct vm_area_struct *vma, unsigned long address) |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 328 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 329 | return ((address - vma->vm_start) >> huge_page_shift(h)) + |
| 330 | (vma->vm_pgoff >> huge_page_order(h)); |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 331 | } |
| 332 | |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 333 | pgoff_t linear_hugepage_index(struct vm_area_struct *vma, |
| 334 | unsigned long address) |
| 335 | { |
| 336 | return vma_hugecache_offset(hstate_vma(vma), vma, address); |
| 337 | } |
| 338 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 339 | /* |
Mel Gorman | 08fba69 | 2009-01-06 14:38:53 -0800 | [diff] [blame] | 340 | * Return the size of the pages allocated when backing a VMA. In the majority |
| 341 | * cases this will be same size as used by the page table entries. |
| 342 | */ |
| 343 | unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) |
| 344 | { |
| 345 | struct hstate *hstate; |
| 346 | |
| 347 | if (!is_vm_hugetlb_page(vma)) |
| 348 | return PAGE_SIZE; |
| 349 | |
| 350 | hstate = hstate_vma(vma); |
| 351 | |
Wanpeng Li | 2415cf1 | 2013-07-03 15:02:43 -0700 | [diff] [blame] | 352 | return 1UL << huge_page_shift(hstate); |
Mel Gorman | 08fba69 | 2009-01-06 14:38:53 -0800 | [diff] [blame] | 353 | } |
Joerg Roedel | f340ca0 | 2009-06-19 15:16:22 +0200 | [diff] [blame] | 354 | EXPORT_SYMBOL_GPL(vma_kernel_pagesize); |
Mel Gorman | 08fba69 | 2009-01-06 14:38:53 -0800 | [diff] [blame] | 355 | |
| 356 | /* |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 357 | * Return the page size being used by the MMU to back a VMA. In the majority |
| 358 | * of cases, the page size used by the kernel matches the MMU size. On |
| 359 | * architectures where it differs, an architecture-specific version of this |
| 360 | * function is required. |
| 361 | */ |
| 362 | #ifndef vma_mmu_pagesize |
| 363 | unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) |
| 364 | { |
| 365 | return vma_kernel_pagesize(vma); |
| 366 | } |
| 367 | #endif |
| 368 | |
| 369 | /* |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 370 | * Flags for MAP_PRIVATE reservations. These are stored in the bottom |
| 371 | * bits of the reservation map pointer, which are always clear due to |
| 372 | * alignment. |
| 373 | */ |
| 374 | #define HPAGE_RESV_OWNER (1UL << 0) |
| 375 | #define HPAGE_RESV_UNMAPPED (1UL << 1) |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 376 | #define HPAGE_RESV_MASK (HPAGE_RESV_OWNER | HPAGE_RESV_UNMAPPED) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 377 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 378 | /* |
| 379 | * These helpers are used to track how many pages are reserved for |
| 380 | * faults in a MAP_PRIVATE mapping. Only the process that called mmap() |
| 381 | * is guaranteed to have their future faults succeed. |
| 382 | * |
| 383 | * With the exception of reset_vma_resv_huge_pages() which is called at fork(), |
| 384 | * the reserve counters are updated with the hugetlb_lock held. It is safe |
| 385 | * to reset the VMA at fork() time as it is not in use yet and there is no |
| 386 | * chance of the global counters getting corrupted as a result of the values. |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 387 | * |
| 388 | * The private mapping reservation is represented in a subtly different |
| 389 | * manner to a shared mapping. A shared mapping has a region map associated |
| 390 | * with the underlying file, this region map represents the backing file |
| 391 | * pages which have ever had a reservation assigned which this persists even |
| 392 | * after the page is instantiated. A private mapping has a region map |
| 393 | * associated with the original mmap which is attached to all VMAs which |
| 394 | * reference it, this region map represents those offsets which have consumed |
| 395 | * reservation ie. where pages have been instantiated. |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 396 | */ |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 397 | static unsigned long get_vma_private_data(struct vm_area_struct *vma) |
| 398 | { |
| 399 | return (unsigned long)vma->vm_private_data; |
| 400 | } |
| 401 | |
| 402 | static void set_vma_private_data(struct vm_area_struct *vma, |
| 403 | unsigned long value) |
| 404 | { |
| 405 | vma->vm_private_data = (void *)value; |
| 406 | } |
| 407 | |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 408 | struct resv_map *resv_map_alloc(void) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 409 | { |
| 410 | struct resv_map *resv_map = kmalloc(sizeof(*resv_map), GFP_KERNEL); |
| 411 | if (!resv_map) |
| 412 | return NULL; |
| 413 | |
| 414 | kref_init(&resv_map->refs); |
Davidlohr Bueso | 7b24d86 | 2014-04-03 14:47:27 -0700 | [diff] [blame] | 415 | spin_lock_init(&resv_map->lock); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 416 | INIT_LIST_HEAD(&resv_map->regions); |
| 417 | |
| 418 | return resv_map; |
| 419 | } |
| 420 | |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 421 | void resv_map_release(struct kref *ref) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 422 | { |
| 423 | struct resv_map *resv_map = container_of(ref, struct resv_map, refs); |
| 424 | |
| 425 | /* Clear out any active regions before we release the map. */ |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 426 | region_truncate(resv_map, 0); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 427 | kfree(resv_map); |
| 428 | } |
| 429 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 430 | static inline struct resv_map *inode_resv_map(struct inode *inode) |
| 431 | { |
| 432 | return inode->i_mapping->private_data; |
| 433 | } |
| 434 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 435 | static struct resv_map *vma_resv_map(struct vm_area_struct *vma) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 436 | { |
Sasha Levin | 81d1b09 | 2014-10-09 15:28:10 -0700 | [diff] [blame] | 437 | VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 438 | if (vma->vm_flags & VM_MAYSHARE) { |
| 439 | struct address_space *mapping = vma->vm_file->f_mapping; |
| 440 | struct inode *inode = mapping->host; |
| 441 | |
| 442 | return inode_resv_map(inode); |
| 443 | |
| 444 | } else { |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 445 | return (struct resv_map *)(get_vma_private_data(vma) & |
| 446 | ~HPAGE_RESV_MASK); |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 447 | } |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 448 | } |
| 449 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 450 | static void set_vma_resv_map(struct vm_area_struct *vma, struct resv_map *map) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 451 | { |
Sasha Levin | 81d1b09 | 2014-10-09 15:28:10 -0700 | [diff] [blame] | 452 | VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); |
| 453 | VM_BUG_ON_VMA(vma->vm_flags & VM_MAYSHARE, vma); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 454 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 455 | set_vma_private_data(vma, (get_vma_private_data(vma) & |
| 456 | HPAGE_RESV_MASK) | (unsigned long)map); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | static void set_vma_resv_flags(struct vm_area_struct *vma, unsigned long flags) |
| 460 | { |
Sasha Levin | 81d1b09 | 2014-10-09 15:28:10 -0700 | [diff] [blame] | 461 | VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); |
| 462 | VM_BUG_ON_VMA(vma->vm_flags & VM_MAYSHARE, vma); |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 463 | |
| 464 | set_vma_private_data(vma, get_vma_private_data(vma) | flags); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | static int is_vma_resv_set(struct vm_area_struct *vma, unsigned long flag) |
| 468 | { |
Sasha Levin | 81d1b09 | 2014-10-09 15:28:10 -0700 | [diff] [blame] | 469 | VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 470 | |
| 471 | return (get_vma_private_data(vma) & flag) != 0; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 472 | } |
| 473 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 474 | /* Reset counters to 0 and clear all HPAGE_RESV_* flags */ |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 475 | void reset_vma_resv_huge_pages(struct vm_area_struct *vma) |
| 476 | { |
Sasha Levin | 81d1b09 | 2014-10-09 15:28:10 -0700 | [diff] [blame] | 477 | VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 478 | if (!(vma->vm_flags & VM_MAYSHARE)) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 479 | vma->vm_private_data = (void *)0; |
| 480 | } |
| 481 | |
| 482 | /* Returns true if the VMA has associated reserve pages */ |
Joonsoo Kim | af0ed73 | 2013-09-11 14:21:18 -0700 | [diff] [blame] | 483 | static int vma_has_reserves(struct vm_area_struct *vma, long chg) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 484 | { |
Joonsoo Kim | af0ed73 | 2013-09-11 14:21:18 -0700 | [diff] [blame] | 485 | if (vma->vm_flags & VM_NORESERVE) { |
| 486 | /* |
| 487 | * This address is already reserved by other process(chg == 0), |
| 488 | * so, we should decrement reserved count. Without decrementing, |
| 489 | * reserve count remains after releasing inode, because this |
| 490 | * allocated page will go into page cache and is regarded as |
| 491 | * coming from reserved pool in releasing step. Currently, we |
| 492 | * don't have any other solution to deal with this situation |
| 493 | * properly, so add work-around here. |
| 494 | */ |
| 495 | if (vma->vm_flags & VM_MAYSHARE && chg == 0) |
| 496 | return 1; |
| 497 | else |
| 498 | return 0; |
| 499 | } |
Joonsoo Kim | a63884e | 2013-09-11 14:21:07 -0700 | [diff] [blame] | 500 | |
| 501 | /* Shared mappings always use reserves */ |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 502 | if (vma->vm_flags & VM_MAYSHARE) |
Mel Gorman | 7f09ca5 | 2008-07-23 21:27:58 -0700 | [diff] [blame] | 503 | return 1; |
Joonsoo Kim | a63884e | 2013-09-11 14:21:07 -0700 | [diff] [blame] | 504 | |
| 505 | /* |
| 506 | * Only the process that called mmap() has reserves for |
| 507 | * private mappings. |
| 508 | */ |
Mel Gorman | 7f09ca5 | 2008-07-23 21:27:58 -0700 | [diff] [blame] | 509 | if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) |
| 510 | return 1; |
Joonsoo Kim | a63884e | 2013-09-11 14:21:07 -0700 | [diff] [blame] | 511 | |
Mel Gorman | 7f09ca5 | 2008-07-23 21:27:58 -0700 | [diff] [blame] | 512 | return 0; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 513 | } |
| 514 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 515 | static void enqueue_huge_page(struct hstate *h, struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | { |
| 517 | int nid = page_to_nid(page); |
Aneesh Kumar K.V | 0edaecf | 2012-07-31 16:42:07 -0700 | [diff] [blame] | 518 | list_move(&page->lru, &h->hugepage_freelists[nid]); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 519 | h->free_huge_pages++; |
| 520 | h->free_huge_pages_node[nid]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | } |
| 522 | |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 523 | static struct page *dequeue_huge_page_node(struct hstate *h, int nid) |
| 524 | { |
| 525 | struct page *page; |
| 526 | |
Naoya Horiguchi | c8721bb | 2013-09-11 14:22:09 -0700 | [diff] [blame] | 527 | list_for_each_entry(page, &h->hugepage_freelists[nid], lru) |
| 528 | if (!is_migrate_isolate_page(page)) |
| 529 | break; |
| 530 | /* |
| 531 | * if 'non-isolated free hugepage' not found on the list, |
| 532 | * the allocation fails. |
| 533 | */ |
| 534 | if (&h->hugepage_freelists[nid] == &page->lru) |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 535 | return NULL; |
Aneesh Kumar K.V | 0edaecf | 2012-07-31 16:42:07 -0700 | [diff] [blame] | 536 | list_move(&page->lru, &h->hugepage_activelist); |
Naoya Horiguchi | a9869b8 | 2010-09-08 10:19:37 +0900 | [diff] [blame] | 537 | set_page_refcounted(page); |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 538 | h->free_huge_pages--; |
| 539 | h->free_huge_pages_node[nid]--; |
| 540 | return page; |
| 541 | } |
| 542 | |
Naoya Horiguchi | 86cdb46 | 2013-09-11 14:22:13 -0700 | [diff] [blame] | 543 | /* Movability of hugepages depends on migration support. */ |
| 544 | static inline gfp_t htlb_alloc_mask(struct hstate *h) |
| 545 | { |
Naoya Horiguchi | 100873d | 2014-06-04 16:10:56 -0700 | [diff] [blame] | 546 | if (hugepages_treat_as_movable || hugepage_migration_supported(h)) |
Naoya Horiguchi | 86cdb46 | 2013-09-11 14:22:13 -0700 | [diff] [blame] | 547 | return GFP_HIGHUSER_MOVABLE; |
| 548 | else |
| 549 | return GFP_HIGHUSER; |
| 550 | } |
| 551 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 552 | static struct page *dequeue_huge_page_vma(struct hstate *h, |
| 553 | struct vm_area_struct *vma, |
Joonsoo Kim | af0ed73 | 2013-09-11 14:21:18 -0700 | [diff] [blame] | 554 | unsigned long address, int avoid_reserve, |
| 555 | long chg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | { |
Konstantin Khlebnikov | b1c12cb | 2012-04-25 16:01:46 -0700 | [diff] [blame] | 557 | struct page *page = NULL; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 558 | struct mempolicy *mpol; |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 559 | nodemask_t *nodemask; |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 560 | struct zonelist *zonelist; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 561 | struct zone *zone; |
| 562 | struct zoneref *z; |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 563 | unsigned int cpuset_mems_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 565 | /* |
| 566 | * A child process with MAP_PRIVATE mappings created by their parent |
| 567 | * have no page reserves. This check ensures that reservations are |
| 568 | * not "stolen". The child may still get SIGKILLed |
| 569 | */ |
Joonsoo Kim | af0ed73 | 2013-09-11 14:21:18 -0700 | [diff] [blame] | 570 | if (!vma_has_reserves(vma, chg) && |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 571 | h->free_huge_pages - h->resv_huge_pages == 0) |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 572 | goto err; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 573 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 574 | /* If reserves cannot be used, ensure enough pages are in the pool */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 575 | if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0) |
Justin P. Mattock | 6eab04a | 2011-04-08 19:49:08 -0700 | [diff] [blame] | 576 | goto err; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 577 | |
Joonsoo Kim | 9966c4b | 2013-09-11 14:20:50 -0700 | [diff] [blame] | 578 | retry_cpuset: |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 579 | cpuset_mems_cookie = read_mems_allowed_begin(); |
Joonsoo Kim | 9966c4b | 2013-09-11 14:20:50 -0700 | [diff] [blame] | 580 | zonelist = huge_zonelist(vma, address, |
Naoya Horiguchi | 86cdb46 | 2013-09-11 14:22:13 -0700 | [diff] [blame] | 581 | htlb_alloc_mask(h), &mpol, &nodemask); |
Joonsoo Kim | 9966c4b | 2013-09-11 14:20:50 -0700 | [diff] [blame] | 582 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 583 | for_each_zone_zonelist_nodemask(zone, z, zonelist, |
| 584 | MAX_NR_ZONES - 1, nodemask) { |
Vladimir Davydov | 344736f | 2014-10-20 15:50:30 +0400 | [diff] [blame] | 585 | if (cpuset_zone_allowed(zone, htlb_alloc_mask(h))) { |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 586 | page = dequeue_huge_page_node(h, zone_to_nid(zone)); |
| 587 | if (page) { |
Joonsoo Kim | af0ed73 | 2013-09-11 14:21:18 -0700 | [diff] [blame] | 588 | if (avoid_reserve) |
| 589 | break; |
| 590 | if (!vma_has_reserves(vma, chg)) |
| 591 | break; |
| 592 | |
Joonsoo Kim | 07443a8 | 2013-09-11 14:21:58 -0700 | [diff] [blame] | 593 | SetPagePrivate(page); |
Joonsoo Kim | af0ed73 | 2013-09-11 14:21:18 -0700 | [diff] [blame] | 594 | h->resv_huge_pages--; |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 595 | break; |
| 596 | } |
Andrew Morton | 3abf7af | 2007-07-19 01:49:08 -0700 | [diff] [blame] | 597 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | } |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 599 | |
| 600 | mpol_cond_put(mpol); |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 601 | if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 602 | goto retry_cpuset; |
| 603 | return page; |
| 604 | |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 605 | err: |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 606 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | |
Luiz Capitulino | 1cac6f2 | 2014-06-04 16:07:11 -0700 | [diff] [blame] | 609 | /* |
| 610 | * common helper functions for hstate_next_node_to_{alloc|free}. |
| 611 | * We may have allocated or freed a huge page based on a different |
| 612 | * nodes_allowed previously, so h->next_node_to_{alloc|free} might |
| 613 | * be outside of *nodes_allowed. Ensure that we use an allowed |
| 614 | * node for alloc or free. |
| 615 | */ |
| 616 | static int next_node_allowed(int nid, nodemask_t *nodes_allowed) |
| 617 | { |
| 618 | nid = next_node(nid, *nodes_allowed); |
| 619 | if (nid == MAX_NUMNODES) |
| 620 | nid = first_node(*nodes_allowed); |
| 621 | VM_BUG_ON(nid >= MAX_NUMNODES); |
| 622 | |
| 623 | return nid; |
| 624 | } |
| 625 | |
| 626 | static int get_valid_node_allowed(int nid, nodemask_t *nodes_allowed) |
| 627 | { |
| 628 | if (!node_isset(nid, *nodes_allowed)) |
| 629 | nid = next_node_allowed(nid, nodes_allowed); |
| 630 | return nid; |
| 631 | } |
| 632 | |
| 633 | /* |
| 634 | * returns the previously saved node ["this node"] from which to |
| 635 | * allocate a persistent huge page for the pool and advance the |
| 636 | * next node from which to allocate, handling wrap at end of node |
| 637 | * mask. |
| 638 | */ |
| 639 | static int hstate_next_node_to_alloc(struct hstate *h, |
| 640 | nodemask_t *nodes_allowed) |
| 641 | { |
| 642 | int nid; |
| 643 | |
| 644 | VM_BUG_ON(!nodes_allowed); |
| 645 | |
| 646 | nid = get_valid_node_allowed(h->next_nid_to_alloc, nodes_allowed); |
| 647 | h->next_nid_to_alloc = next_node_allowed(nid, nodes_allowed); |
| 648 | |
| 649 | return nid; |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * helper for free_pool_huge_page() - return the previously saved |
| 654 | * node ["this node"] from which to free a huge page. Advance the |
| 655 | * next node id whether or not we find a free huge page to free so |
| 656 | * that the next attempt to free addresses the next node. |
| 657 | */ |
| 658 | static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed) |
| 659 | { |
| 660 | int nid; |
| 661 | |
| 662 | VM_BUG_ON(!nodes_allowed); |
| 663 | |
| 664 | nid = get_valid_node_allowed(h->next_nid_to_free, nodes_allowed); |
| 665 | h->next_nid_to_free = next_node_allowed(nid, nodes_allowed); |
| 666 | |
| 667 | return nid; |
| 668 | } |
| 669 | |
| 670 | #define for_each_node_mask_to_alloc(hs, nr_nodes, node, mask) \ |
| 671 | for (nr_nodes = nodes_weight(*mask); \ |
| 672 | nr_nodes > 0 && \ |
| 673 | ((node = hstate_next_node_to_alloc(hs, mask)) || 1); \ |
| 674 | nr_nodes--) |
| 675 | |
| 676 | #define for_each_node_mask_to_free(hs, nr_nodes, node, mask) \ |
| 677 | for (nr_nodes = nodes_weight(*mask); \ |
| 678 | nr_nodes > 0 && \ |
| 679 | ((node = hstate_next_node_to_free(hs, mask)) || 1); \ |
| 680 | nr_nodes--) |
| 681 | |
Luiz Capitulino | 944d9fe | 2014-06-04 16:07:13 -0700 | [diff] [blame] | 682 | #if defined(CONFIG_CMA) && defined(CONFIG_X86_64) |
| 683 | static void destroy_compound_gigantic_page(struct page *page, |
| 684 | unsigned long order) |
| 685 | { |
| 686 | int i; |
| 687 | int nr_pages = 1 << order; |
| 688 | struct page *p = page + 1; |
| 689 | |
| 690 | for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) { |
| 691 | __ClearPageTail(p); |
| 692 | set_page_refcounted(p); |
| 693 | p->first_page = NULL; |
| 694 | } |
| 695 | |
| 696 | set_compound_order(page, 0); |
| 697 | __ClearPageHead(page); |
| 698 | } |
| 699 | |
| 700 | static void free_gigantic_page(struct page *page, unsigned order) |
| 701 | { |
| 702 | free_contig_range(page_to_pfn(page), 1 << order); |
| 703 | } |
| 704 | |
| 705 | static int __alloc_gigantic_page(unsigned long start_pfn, |
| 706 | unsigned long nr_pages) |
| 707 | { |
| 708 | unsigned long end_pfn = start_pfn + nr_pages; |
| 709 | return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
| 710 | } |
| 711 | |
| 712 | static bool pfn_range_valid_gigantic(unsigned long start_pfn, |
| 713 | unsigned long nr_pages) |
| 714 | { |
| 715 | unsigned long i, end_pfn = start_pfn + nr_pages; |
| 716 | struct page *page; |
| 717 | |
| 718 | for (i = start_pfn; i < end_pfn; i++) { |
| 719 | if (!pfn_valid(i)) |
| 720 | return false; |
| 721 | |
| 722 | page = pfn_to_page(i); |
| 723 | |
| 724 | if (PageReserved(page)) |
| 725 | return false; |
| 726 | |
| 727 | if (page_count(page) > 0) |
| 728 | return false; |
| 729 | |
| 730 | if (PageHuge(page)) |
| 731 | return false; |
| 732 | } |
| 733 | |
| 734 | return true; |
| 735 | } |
| 736 | |
| 737 | static bool zone_spans_last_pfn(const struct zone *zone, |
| 738 | unsigned long start_pfn, unsigned long nr_pages) |
| 739 | { |
| 740 | unsigned long last_pfn = start_pfn + nr_pages - 1; |
| 741 | return zone_spans_pfn(zone, last_pfn); |
| 742 | } |
| 743 | |
| 744 | static struct page *alloc_gigantic_page(int nid, unsigned order) |
| 745 | { |
| 746 | unsigned long nr_pages = 1 << order; |
| 747 | unsigned long ret, pfn, flags; |
| 748 | struct zone *z; |
| 749 | |
| 750 | z = NODE_DATA(nid)->node_zones; |
| 751 | for (; z - NODE_DATA(nid)->node_zones < MAX_NR_ZONES; z++) { |
| 752 | spin_lock_irqsave(&z->lock, flags); |
| 753 | |
| 754 | pfn = ALIGN(z->zone_start_pfn, nr_pages); |
| 755 | while (zone_spans_last_pfn(z, pfn, nr_pages)) { |
| 756 | if (pfn_range_valid_gigantic(pfn, nr_pages)) { |
| 757 | /* |
| 758 | * We release the zone lock here because |
| 759 | * alloc_contig_range() will also lock the zone |
| 760 | * at some point. If there's an allocation |
| 761 | * spinning on this lock, it may win the race |
| 762 | * and cause alloc_contig_range() to fail... |
| 763 | */ |
| 764 | spin_unlock_irqrestore(&z->lock, flags); |
| 765 | ret = __alloc_gigantic_page(pfn, nr_pages); |
| 766 | if (!ret) |
| 767 | return pfn_to_page(pfn); |
| 768 | spin_lock_irqsave(&z->lock, flags); |
| 769 | } |
| 770 | pfn += nr_pages; |
| 771 | } |
| 772 | |
| 773 | spin_unlock_irqrestore(&z->lock, flags); |
| 774 | } |
| 775 | |
| 776 | return NULL; |
| 777 | } |
| 778 | |
| 779 | static void prep_new_huge_page(struct hstate *h, struct page *page, int nid); |
| 780 | static void prep_compound_gigantic_page(struct page *page, unsigned long order); |
| 781 | |
| 782 | static struct page *alloc_fresh_gigantic_page_node(struct hstate *h, int nid) |
| 783 | { |
| 784 | struct page *page; |
| 785 | |
| 786 | page = alloc_gigantic_page(nid, huge_page_order(h)); |
| 787 | if (page) { |
| 788 | prep_compound_gigantic_page(page, huge_page_order(h)); |
| 789 | prep_new_huge_page(h, page, nid); |
| 790 | } |
| 791 | |
| 792 | return page; |
| 793 | } |
| 794 | |
| 795 | static int alloc_fresh_gigantic_page(struct hstate *h, |
| 796 | nodemask_t *nodes_allowed) |
| 797 | { |
| 798 | struct page *page = NULL; |
| 799 | int nr_nodes, node; |
| 800 | |
| 801 | for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) { |
| 802 | page = alloc_fresh_gigantic_page_node(h, node); |
| 803 | if (page) |
| 804 | return 1; |
| 805 | } |
| 806 | |
| 807 | return 0; |
| 808 | } |
| 809 | |
| 810 | static inline bool gigantic_page_supported(void) { return true; } |
| 811 | #else |
| 812 | static inline bool gigantic_page_supported(void) { return false; } |
| 813 | static inline void free_gigantic_page(struct page *page, unsigned order) { } |
| 814 | static inline void destroy_compound_gigantic_page(struct page *page, |
| 815 | unsigned long order) { } |
| 816 | static inline int alloc_fresh_gigantic_page(struct hstate *h, |
| 817 | nodemask_t *nodes_allowed) { return 0; } |
| 818 | #endif |
| 819 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 820 | static void update_and_free_page(struct hstate *h, struct page *page) |
Adam Litke | 6af2acb | 2007-10-16 01:26:16 -0700 | [diff] [blame] | 821 | { |
| 822 | int i; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 823 | |
Luiz Capitulino | 944d9fe | 2014-06-04 16:07:13 -0700 | [diff] [blame] | 824 | if (hstate_is_gigantic(h) && !gigantic_page_supported()) |
| 825 | return; |
Andy Whitcroft | 18229df | 2008-11-06 12:53:27 -0800 | [diff] [blame] | 826 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 827 | h->nr_huge_pages--; |
| 828 | h->nr_huge_pages_node[page_to_nid(page)]--; |
| 829 | for (i = 0; i < pages_per_huge_page(h); i++) { |
Chris Forbes | 32f8452 | 2011-07-25 17:12:14 -0700 | [diff] [blame] | 830 | page[i].flags &= ~(1 << PG_locked | 1 << PG_error | |
| 831 | 1 << PG_referenced | 1 << PG_dirty | |
Luiz Capitulino | a7407a2 | 2014-06-04 16:07:09 -0700 | [diff] [blame] | 832 | 1 << PG_active | 1 << PG_private | |
| 833 | 1 << PG_writeback); |
Adam Litke | 6af2acb | 2007-10-16 01:26:16 -0700 | [diff] [blame] | 834 | } |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 835 | VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page); |
Adam Litke | 6af2acb | 2007-10-16 01:26:16 -0700 | [diff] [blame] | 836 | set_compound_page_dtor(page, NULL); |
| 837 | set_page_refcounted(page); |
Luiz Capitulino | 944d9fe | 2014-06-04 16:07:13 -0700 | [diff] [blame] | 838 | if (hstate_is_gigantic(h)) { |
| 839 | destroy_compound_gigantic_page(page, huge_page_order(h)); |
| 840 | free_gigantic_page(page, huge_page_order(h)); |
| 841 | } else { |
| 842 | arch_release_hugepage(page); |
| 843 | __free_pages(page, huge_page_order(h)); |
| 844 | } |
Adam Litke | 6af2acb | 2007-10-16 01:26:16 -0700 | [diff] [blame] | 845 | } |
| 846 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 847 | struct hstate *size_to_hstate(unsigned long size) |
| 848 | { |
| 849 | struct hstate *h; |
| 850 | |
| 851 | for_each_hstate(h) { |
| 852 | if (huge_page_size(h) == size) |
| 853 | return h; |
| 854 | } |
| 855 | return NULL; |
| 856 | } |
| 857 | |
Atsushi Kumagai | 8f1d26d | 2014-07-30 16:08:39 -0700 | [diff] [blame] | 858 | void free_huge_page(struct page *page) |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 859 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 860 | /* |
| 861 | * Can't pass hstate in here because it is called from the |
| 862 | * compound page destructor. |
| 863 | */ |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 864 | struct hstate *h = page_hstate(page); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 865 | int nid = page_to_nid(page); |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 866 | struct hugepage_subpool *spool = |
| 867 | (struct hugepage_subpool *)page_private(page); |
Joonsoo Kim | 07443a8 | 2013-09-11 14:21:58 -0700 | [diff] [blame] | 868 | bool restore_reserve; |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 869 | |
Andy Whitcroft | e5df70a | 2008-02-23 15:23:32 -0800 | [diff] [blame] | 870 | set_page_private(page, 0); |
Mel Gorman | 23be746 | 2010-04-23 13:17:56 -0400 | [diff] [blame] | 871 | page->mapping = NULL; |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 872 | BUG_ON(page_count(page)); |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 873 | BUG_ON(page_mapcount(page)); |
Joonsoo Kim | 07443a8 | 2013-09-11 14:21:58 -0700 | [diff] [blame] | 874 | restore_reserve = PagePrivate(page); |
Joonsoo Kim | 16c794b | 2013-10-16 13:46:48 -0700 | [diff] [blame] | 875 | ClearPagePrivate(page); |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 876 | |
| 877 | spin_lock(&hugetlb_lock); |
Aneesh Kumar K.V | 6d76dcf | 2012-07-31 16:42:18 -0700 | [diff] [blame] | 878 | hugetlb_cgroup_uncharge_page(hstate_index(h), |
| 879 | pages_per_huge_page(h), page); |
Joonsoo Kim | 07443a8 | 2013-09-11 14:21:58 -0700 | [diff] [blame] | 880 | if (restore_reserve) |
| 881 | h->resv_huge_pages++; |
| 882 | |
Luiz Capitulino | 944d9fe | 2014-06-04 16:07:13 -0700 | [diff] [blame] | 883 | if (h->surplus_huge_pages_node[nid]) { |
Aneesh Kumar K.V | 0edaecf | 2012-07-31 16:42:07 -0700 | [diff] [blame] | 884 | /* remove the page from active list */ |
| 885 | list_del(&page->lru); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 886 | update_and_free_page(h, page); |
| 887 | h->surplus_huge_pages--; |
| 888 | h->surplus_huge_pages_node[nid]--; |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 889 | } else { |
Will Deacon | 5d3a551 | 2012-10-08 16:29:32 -0700 | [diff] [blame] | 890 | arch_clear_hugepage_flags(page); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 891 | enqueue_huge_page(h, page); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 892 | } |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 893 | spin_unlock(&hugetlb_lock); |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 894 | hugepage_subpool_put_pages(spool, 1); |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 895 | } |
| 896 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 897 | static void prep_new_huge_page(struct hstate *h, struct page *page, int nid) |
Andi Kleen | b7ba30c | 2008-07-23 21:27:40 -0700 | [diff] [blame] | 898 | { |
Aneesh Kumar K.V | 0edaecf | 2012-07-31 16:42:07 -0700 | [diff] [blame] | 899 | INIT_LIST_HEAD(&page->lru); |
Andi Kleen | b7ba30c | 2008-07-23 21:27:40 -0700 | [diff] [blame] | 900 | set_compound_page_dtor(page, free_huge_page); |
| 901 | spin_lock(&hugetlb_lock); |
Aneesh Kumar K.V | 9dd540e | 2012-07-31 16:42:15 -0700 | [diff] [blame] | 902 | set_hugetlb_cgroup(page, NULL); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 903 | h->nr_huge_pages++; |
| 904 | h->nr_huge_pages_node[nid]++; |
Andi Kleen | b7ba30c | 2008-07-23 21:27:40 -0700 | [diff] [blame] | 905 | spin_unlock(&hugetlb_lock); |
| 906 | put_page(page); /* free it into the hugepage allocator */ |
| 907 | } |
| 908 | |
Luiz Capitulino | 2906dd5 | 2014-06-04 16:07:06 -0700 | [diff] [blame] | 909 | static void prep_compound_gigantic_page(struct page *page, unsigned long order) |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 910 | { |
| 911 | int i; |
| 912 | int nr_pages = 1 << order; |
| 913 | struct page *p = page + 1; |
| 914 | |
| 915 | /* we rely on prep_new_huge_page to set the destructor */ |
| 916 | set_compound_order(page, order); |
| 917 | __SetPageHead(page); |
Andrea Arcangeli | ef5a22b | 2013-10-16 13:46:56 -0700 | [diff] [blame] | 918 | __ClearPageReserved(page); |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 919 | for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) { |
Andrea Arcangeli | ef5a22b | 2013-10-16 13:46:56 -0700 | [diff] [blame] | 920 | /* |
| 921 | * For gigantic hugepages allocated through bootmem at |
| 922 | * boot, it's safer to be consistent with the not-gigantic |
| 923 | * hugepages and clear the PG_reserved bit from all tail pages |
| 924 | * too. Otherwse drivers using get_user_pages() to access tail |
| 925 | * pages may get the reference counting wrong if they see |
| 926 | * PG_reserved set on a tail page (despite the head page not |
| 927 | * having PG_reserved set). Enforcing this consistency between |
| 928 | * head and tail pages allows drivers to optimize away a check |
| 929 | * on the head page when they need know if put_page() is needed |
| 930 | * after get_user_pages(). |
| 931 | */ |
| 932 | __ClearPageReserved(p); |
Youquan Song | 58a84aa | 2011-12-08 14:34:18 -0800 | [diff] [blame] | 933 | set_page_count(p, 0); |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 934 | p->first_page = page; |
David Rientjes | 44fc805 | 2015-03-12 16:25:54 -0700 | [diff] [blame] | 935 | /* Make sure p->first_page is always valid for PageTail() */ |
| 936 | smp_wmb(); |
| 937 | __SetPageTail(p); |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 938 | } |
| 939 | } |
| 940 | |
Andrew Morton | 7795912 | 2012-10-08 16:34:11 -0700 | [diff] [blame] | 941 | /* |
| 942 | * PageHuge() only returns true for hugetlbfs pages, but not for normal or |
| 943 | * transparent huge pages. See the PageTransHuge() documentation for more |
| 944 | * details. |
| 945 | */ |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 946 | int PageHuge(struct page *page) |
| 947 | { |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 948 | if (!PageCompound(page)) |
| 949 | return 0; |
| 950 | |
| 951 | page = compound_head(page); |
Andrew Morton | 758f66a | 2014-01-21 15:48:57 -0800 | [diff] [blame] | 952 | return get_compound_page_dtor(page) == free_huge_page; |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 953 | } |
Naoya Horiguchi | 43131e1 | 2010-05-28 09:29:22 +0900 | [diff] [blame] | 954 | EXPORT_SYMBOL_GPL(PageHuge); |
| 955 | |
Andrea Arcangeli | 27c73ae | 2013-11-21 14:32:02 -0800 | [diff] [blame] | 956 | /* |
| 957 | * PageHeadHuge() only returns true for hugetlbfs head page, but not for |
| 958 | * normal or transparent huge pages. |
| 959 | */ |
| 960 | int PageHeadHuge(struct page *page_head) |
| 961 | { |
Andrea Arcangeli | 27c73ae | 2013-11-21 14:32:02 -0800 | [diff] [blame] | 962 | if (!PageHead(page_head)) |
| 963 | return 0; |
| 964 | |
Andrew Morton | 758f66a | 2014-01-21 15:48:57 -0800 | [diff] [blame] | 965 | return get_compound_page_dtor(page_head) == free_huge_page; |
Andrea Arcangeli | 27c73ae | 2013-11-21 14:32:02 -0800 | [diff] [blame] | 966 | } |
Andrea Arcangeli | 27c73ae | 2013-11-21 14:32:02 -0800 | [diff] [blame] | 967 | |
Zhang Yi | 13d60f4 | 2013-06-25 21:19:31 +0800 | [diff] [blame] | 968 | pgoff_t __basepage_index(struct page *page) |
| 969 | { |
| 970 | struct page *page_head = compound_head(page); |
| 971 | pgoff_t index = page_index(page_head); |
| 972 | unsigned long compound_idx; |
| 973 | |
| 974 | if (!PageHuge(page_head)) |
| 975 | return page_index(page); |
| 976 | |
| 977 | if (compound_order(page_head) >= MAX_ORDER) |
| 978 | compound_idx = page_to_pfn(page) - page_to_pfn(page_head); |
| 979 | else |
| 980 | compound_idx = page - page_head; |
| 981 | |
| 982 | return (index << compound_order(page_head)) + compound_idx; |
| 983 | } |
| 984 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 985 | static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | struct page *page; |
Joe Jin | f96efd5 | 2007-07-15 23:38:12 -0700 | [diff] [blame] | 988 | |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 989 | page = alloc_pages_exact_node(nid, |
Naoya Horiguchi | 86cdb46 | 2013-09-11 14:22:13 -0700 | [diff] [blame] | 990 | htlb_alloc_mask(h)|__GFP_COMP|__GFP_THISNODE| |
Nishanth Aravamudan | 551883a | 2008-04-29 00:58:26 -0700 | [diff] [blame] | 991 | __GFP_REPEAT|__GFP_NOWARN, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 992 | huge_page_order(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | if (page) { |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 994 | if (arch_prepare_hugepage(page)) { |
Gerald Schaefer | caff3a2 | 2008-08-12 15:08:38 -0700 | [diff] [blame] | 995 | __free_pages(page, huge_page_order(h)); |
Harvey Harrison | 7b8ee84 | 2008-04-28 14:13:19 -0700 | [diff] [blame] | 996 | return NULL; |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 997 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 998 | prep_new_huge_page(h, page, nid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | } |
Nishanth Aravamudan | 63b4613 | 2007-10-16 01:26:24 -0700 | [diff] [blame] | 1000 | |
| 1001 | return page; |
| 1002 | } |
| 1003 | |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1004 | static int alloc_fresh_huge_page(struct hstate *h, nodemask_t *nodes_allowed) |
| 1005 | { |
| 1006 | struct page *page; |
| 1007 | int nr_nodes, node; |
| 1008 | int ret = 0; |
| 1009 | |
| 1010 | for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) { |
| 1011 | page = alloc_fresh_huge_page_node(h, node); |
| 1012 | if (page) { |
| 1013 | ret = 1; |
| 1014 | break; |
| 1015 | } |
| 1016 | } |
| 1017 | |
| 1018 | if (ret) |
| 1019 | count_vm_event(HTLB_BUDDY_PGALLOC); |
| 1020 | else |
| 1021 | count_vm_event(HTLB_BUDDY_PGALLOC_FAIL); |
| 1022 | |
| 1023 | return ret; |
| 1024 | } |
| 1025 | |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1026 | /* |
| 1027 | * Free huge page from pool from next node to free. |
| 1028 | * Attempt to keep persistent huge pages more or less |
| 1029 | * balanced over allowed nodes. |
| 1030 | * Called with hugetlb_lock locked. |
| 1031 | */ |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1032 | static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed, |
| 1033 | bool acct_surplus) |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1034 | { |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1035 | int nr_nodes, node; |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1036 | int ret = 0; |
| 1037 | |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1038 | for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) { |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 1039 | /* |
| 1040 | * If we're returning unused surplus pages, only examine |
| 1041 | * nodes with surplus pages. |
| 1042 | */ |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1043 | if ((!acct_surplus || h->surplus_huge_pages_node[node]) && |
| 1044 | !list_empty(&h->hugepage_freelists[node])) { |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1045 | struct page *page = |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1046 | list_entry(h->hugepage_freelists[node].next, |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1047 | struct page, lru); |
| 1048 | list_del(&page->lru); |
| 1049 | h->free_huge_pages--; |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1050 | h->free_huge_pages_node[node]--; |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 1051 | if (acct_surplus) { |
| 1052 | h->surplus_huge_pages--; |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1053 | h->surplus_huge_pages_node[node]--; |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 1054 | } |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1055 | update_and_free_page(h, page); |
| 1056 | ret = 1; |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame] | 1057 | break; |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1058 | } |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1059 | } |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1060 | |
| 1061 | return ret; |
| 1062 | } |
| 1063 | |
Naoya Horiguchi | c8721bb | 2013-09-11 14:22:09 -0700 | [diff] [blame] | 1064 | /* |
| 1065 | * Dissolve a given free hugepage into free buddy pages. This function does |
| 1066 | * nothing for in-use (including surplus) hugepages. |
| 1067 | */ |
| 1068 | static void dissolve_free_huge_page(struct page *page) |
| 1069 | { |
| 1070 | spin_lock(&hugetlb_lock); |
| 1071 | if (PageHuge(page) && !page_count(page)) { |
| 1072 | struct hstate *h = page_hstate(page); |
| 1073 | int nid = page_to_nid(page); |
| 1074 | list_del(&page->lru); |
| 1075 | h->free_huge_pages--; |
| 1076 | h->free_huge_pages_node[nid]--; |
| 1077 | update_and_free_page(h, page); |
| 1078 | } |
| 1079 | spin_unlock(&hugetlb_lock); |
| 1080 | } |
| 1081 | |
| 1082 | /* |
| 1083 | * Dissolve free hugepages in a given pfn range. Used by memory hotplug to |
| 1084 | * make specified memory blocks removable from the system. |
| 1085 | * Note that start_pfn should aligned with (minimum) hugepage size. |
| 1086 | */ |
| 1087 | void dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn) |
| 1088 | { |
| 1089 | unsigned int order = 8 * sizeof(void *); |
| 1090 | unsigned long pfn; |
| 1091 | struct hstate *h; |
| 1092 | |
Li Zhong | d017763 | 2014-08-06 16:07:56 -0700 | [diff] [blame] | 1093 | if (!hugepages_supported()) |
| 1094 | return; |
| 1095 | |
Naoya Horiguchi | c8721bb | 2013-09-11 14:22:09 -0700 | [diff] [blame] | 1096 | /* Set scan step to minimum hugepage size */ |
| 1097 | for_each_hstate(h) |
| 1098 | if (order > huge_page_order(h)) |
| 1099 | order = huge_page_order(h); |
| 1100 | VM_BUG_ON(!IS_ALIGNED(start_pfn, 1 << order)); |
| 1101 | for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << order) |
| 1102 | dissolve_free_huge_page(pfn_to_page(pfn)); |
| 1103 | } |
| 1104 | |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1105 | static struct page *alloc_buddy_huge_page(struct hstate *h, int nid) |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1106 | { |
| 1107 | struct page *page; |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1108 | unsigned int r_nid; |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1109 | |
Luiz Capitulino | bae7f4a | 2014-06-04 16:07:08 -0700 | [diff] [blame] | 1110 | if (hstate_is_gigantic(h)) |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1111 | return NULL; |
| 1112 | |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1113 | /* |
| 1114 | * Assume we will successfully allocate the surplus page to |
| 1115 | * prevent racing processes from causing the surplus to exceed |
| 1116 | * overcommit |
| 1117 | * |
| 1118 | * This however introduces a different race, where a process B |
| 1119 | * tries to grow the static hugepage pool while alloc_pages() is |
| 1120 | * called by process A. B will only examine the per-node |
| 1121 | * counters in determining if surplus huge pages can be |
| 1122 | * converted to normal huge pages in adjust_pool_surplus(). A |
| 1123 | * won't be able to increment the per-node counter, until the |
| 1124 | * lock is dropped by B, but B doesn't drop hugetlb_lock until |
| 1125 | * no more huge pages can be converted from surplus to normal |
| 1126 | * state (and doesn't try to convert again). Thus, we have a |
| 1127 | * case where a surplus huge page exists, the pool is grown, and |
| 1128 | * the surplus huge page still exists after, even though it |
| 1129 | * should just have been converted to a normal huge page. This |
| 1130 | * does not leak memory, though, as the hugepage will be freed |
| 1131 | * once it is out of use. It also does not allow the counters to |
| 1132 | * go out of whack in adjust_pool_surplus() as we don't modify |
| 1133 | * the node values until we've gotten the hugepage and only the |
| 1134 | * per-node value is checked there. |
| 1135 | */ |
| 1136 | spin_lock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1137 | if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages) { |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1138 | spin_unlock(&hugetlb_lock); |
| 1139 | return NULL; |
| 1140 | } else { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1141 | h->nr_huge_pages++; |
| 1142 | h->surplus_huge_pages++; |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1143 | } |
| 1144 | spin_unlock(&hugetlb_lock); |
| 1145 | |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1146 | if (nid == NUMA_NO_NODE) |
Naoya Horiguchi | 86cdb46 | 2013-09-11 14:22:13 -0700 | [diff] [blame] | 1147 | page = alloc_pages(htlb_alloc_mask(h)|__GFP_COMP| |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1148 | __GFP_REPEAT|__GFP_NOWARN, |
| 1149 | huge_page_order(h)); |
| 1150 | else |
| 1151 | page = alloc_pages_exact_node(nid, |
Naoya Horiguchi | 86cdb46 | 2013-09-11 14:22:13 -0700 | [diff] [blame] | 1152 | htlb_alloc_mask(h)|__GFP_COMP|__GFP_THISNODE| |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1153 | __GFP_REPEAT|__GFP_NOWARN, huge_page_order(h)); |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1154 | |
Gerald Schaefer | caff3a2 | 2008-08-12 15:08:38 -0700 | [diff] [blame] | 1155 | if (page && arch_prepare_hugepage(page)) { |
| 1156 | __free_pages(page, huge_page_order(h)); |
Hillf Danton | ea5768c | 2012-01-10 15:08:30 -0800 | [diff] [blame] | 1157 | page = NULL; |
Gerald Schaefer | caff3a2 | 2008-08-12 15:08:38 -0700 | [diff] [blame] | 1158 | } |
| 1159 | |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1160 | spin_lock(&hugetlb_lock); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1161 | if (page) { |
Aneesh Kumar K.V | 0edaecf | 2012-07-31 16:42:07 -0700 | [diff] [blame] | 1162 | INIT_LIST_HEAD(&page->lru); |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1163 | r_nid = page_to_nid(page); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1164 | set_compound_page_dtor(page, free_huge_page); |
Aneesh Kumar K.V | 9dd540e | 2012-07-31 16:42:15 -0700 | [diff] [blame] | 1165 | set_hugetlb_cgroup(page, NULL); |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1166 | /* |
| 1167 | * We incremented the global counters already |
| 1168 | */ |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1169 | h->nr_huge_pages_node[r_nid]++; |
| 1170 | h->surplus_huge_pages_node[r_nid]++; |
Adam Litke | 3b11630 | 2008-04-28 02:13:06 -0700 | [diff] [blame] | 1171 | __count_vm_event(HTLB_BUDDY_PGALLOC); |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1172 | } else { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1173 | h->nr_huge_pages--; |
| 1174 | h->surplus_huge_pages--; |
Adam Litke | 3b11630 | 2008-04-28 02:13:06 -0700 | [diff] [blame] | 1175 | __count_vm_event(HTLB_BUDDY_PGALLOC_FAIL); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1176 | } |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1177 | spin_unlock(&hugetlb_lock); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1178 | |
| 1179 | return page; |
| 1180 | } |
| 1181 | |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1182 | /* |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1183 | * This allocation function is useful in the context where vma is irrelevant. |
| 1184 | * E.g. soft-offlining uses this function because it only cares physical |
| 1185 | * address of error page. |
| 1186 | */ |
| 1187 | struct page *alloc_huge_page_node(struct hstate *h, int nid) |
| 1188 | { |
Joonsoo Kim | 4ef9184 | 2013-09-11 14:21:51 -0700 | [diff] [blame] | 1189 | struct page *page = NULL; |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1190 | |
| 1191 | spin_lock(&hugetlb_lock); |
Joonsoo Kim | 4ef9184 | 2013-09-11 14:21:51 -0700 | [diff] [blame] | 1192 | if (h->free_huge_pages - h->resv_huge_pages > 0) |
| 1193 | page = dequeue_huge_page_node(h, nid); |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1194 | spin_unlock(&hugetlb_lock); |
| 1195 | |
Aneesh Kumar K.V | 94ae8ba | 2012-07-31 16:42:35 -0700 | [diff] [blame] | 1196 | if (!page) |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1197 | page = alloc_buddy_huge_page(h, nid); |
| 1198 | |
| 1199 | return page; |
| 1200 | } |
| 1201 | |
| 1202 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1203 | * Increase the hugetlb pool such that it can accommodate a reservation |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1204 | * of size 'delta'. |
| 1205 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1206 | static int gather_surplus_pages(struct hstate *h, int delta) |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1207 | { |
| 1208 | struct list_head surplus_list; |
| 1209 | struct page *page, *tmp; |
| 1210 | int ret, i; |
| 1211 | int needed, allocated; |
Hillf Danton | 28073b0 | 2012-03-21 16:34:00 -0700 | [diff] [blame] | 1212 | bool alloc_ok = true; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1213 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1214 | needed = (h->resv_huge_pages + delta) - h->free_huge_pages; |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 1215 | if (needed <= 0) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1216 | h->resv_huge_pages += delta; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1217 | return 0; |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 1218 | } |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1219 | |
| 1220 | allocated = 0; |
| 1221 | INIT_LIST_HEAD(&surplus_list); |
| 1222 | |
| 1223 | ret = -ENOMEM; |
| 1224 | retry: |
| 1225 | spin_unlock(&hugetlb_lock); |
| 1226 | for (i = 0; i < needed; i++) { |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1227 | page = alloc_buddy_huge_page(h, NUMA_NO_NODE); |
Hillf Danton | 28073b0 | 2012-03-21 16:34:00 -0700 | [diff] [blame] | 1228 | if (!page) { |
| 1229 | alloc_ok = false; |
| 1230 | break; |
| 1231 | } |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1232 | list_add(&page->lru, &surplus_list); |
| 1233 | } |
Hillf Danton | 28073b0 | 2012-03-21 16:34:00 -0700 | [diff] [blame] | 1234 | allocated += i; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1235 | |
| 1236 | /* |
| 1237 | * After retaking hugetlb_lock, we need to recalculate 'needed' |
| 1238 | * because either resv_huge_pages or free_huge_pages may have changed. |
| 1239 | */ |
| 1240 | spin_lock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1241 | needed = (h->resv_huge_pages + delta) - |
| 1242 | (h->free_huge_pages + allocated); |
Hillf Danton | 28073b0 | 2012-03-21 16:34:00 -0700 | [diff] [blame] | 1243 | if (needed > 0) { |
| 1244 | if (alloc_ok) |
| 1245 | goto retry; |
| 1246 | /* |
| 1247 | * We were not able to allocate enough pages to |
| 1248 | * satisfy the entire reservation so we free what |
| 1249 | * we've allocated so far. |
| 1250 | */ |
| 1251 | goto free; |
| 1252 | } |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1253 | /* |
| 1254 | * The surplus_list now contains _at_least_ the number of extra pages |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1255 | * needed to accommodate the reservation. Add the appropriate number |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1256 | * of pages to the hugetlb pool and free the extras back to the buddy |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 1257 | * allocator. Commit the entire reservation here to prevent another |
| 1258 | * process from stealing the pages as they are added to the pool but |
| 1259 | * before they are reserved. |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1260 | */ |
| 1261 | needed += allocated; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1262 | h->resv_huge_pages += delta; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1263 | ret = 0; |
Naoya Horiguchi | a9869b8 | 2010-09-08 10:19:37 +0900 | [diff] [blame] | 1264 | |
Adam Litke | 19fc3f0 | 2008-04-28 02:12:20 -0700 | [diff] [blame] | 1265 | /* Free the needed pages to the hugetlb pool */ |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1266 | list_for_each_entry_safe(page, tmp, &surplus_list, lru) { |
Adam Litke | 19fc3f0 | 2008-04-28 02:12:20 -0700 | [diff] [blame] | 1267 | if ((--needed) < 0) |
| 1268 | break; |
Naoya Horiguchi | a9869b8 | 2010-09-08 10:19:37 +0900 | [diff] [blame] | 1269 | /* |
| 1270 | * This page is now managed by the hugetlb allocator and has |
| 1271 | * no users -- drop the buddy allocator's reference. |
| 1272 | */ |
| 1273 | put_page_testzero(page); |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 1274 | VM_BUG_ON_PAGE(page_count(page), page); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1275 | enqueue_huge_page(h, page); |
Adam Litke | 19fc3f0 | 2008-04-28 02:12:20 -0700 | [diff] [blame] | 1276 | } |
Hillf Danton | 28073b0 | 2012-03-21 16:34:00 -0700 | [diff] [blame] | 1277 | free: |
Hillf Danton | b0365c8 | 2011-12-28 15:57:16 -0800 | [diff] [blame] | 1278 | spin_unlock(&hugetlb_lock); |
Adam Litke | 19fc3f0 | 2008-04-28 02:12:20 -0700 | [diff] [blame] | 1279 | |
| 1280 | /* Free unnecessary surplus pages to the buddy allocator */ |
Joonsoo Kim | c0d934b | 2013-09-11 14:21:02 -0700 | [diff] [blame] | 1281 | list_for_each_entry_safe(page, tmp, &surplus_list, lru) |
| 1282 | put_page(page); |
Naoya Horiguchi | a9869b8 | 2010-09-08 10:19:37 +0900 | [diff] [blame] | 1283 | spin_lock(&hugetlb_lock); |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1284 | |
| 1285 | return ret; |
| 1286 | } |
| 1287 | |
| 1288 | /* |
| 1289 | * When releasing a hugetlb pool reservation, any surplus pages that were |
| 1290 | * allocated to satisfy the reservation must be explicitly freed if they were |
| 1291 | * never used. |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 1292 | * Called with hugetlb_lock held. |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1293 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1294 | static void return_unused_surplus_pages(struct hstate *h, |
| 1295 | unsigned long unused_resv_pages) |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1296 | { |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1297 | unsigned long nr_pages; |
| 1298 | |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 1299 | /* Uncommit the reservation */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1300 | h->resv_huge_pages -= unused_resv_pages; |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 1301 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1302 | /* Cannot return gigantic pages currently */ |
Luiz Capitulino | bae7f4a | 2014-06-04 16:07:08 -0700 | [diff] [blame] | 1303 | if (hstate_is_gigantic(h)) |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1304 | return; |
| 1305 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1306 | nr_pages = min(unused_resv_pages, h->surplus_huge_pages); |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1307 | |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 1308 | /* |
| 1309 | * We want to release as many surplus pages as possible, spread |
Lee Schermerhorn | 9b5e5d0 | 2009-12-14 17:58:32 -0800 | [diff] [blame] | 1310 | * evenly across all nodes with memory. Iterate across these nodes |
| 1311 | * until we can no longer free unreserved surplus pages. This occurs |
| 1312 | * when the nodes with surplus pages have no free pages. |
| 1313 | * free_pool_huge_page() will balance the the freed pages across the |
| 1314 | * on-line nodes with memory and will handle the hstate accounting. |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 1315 | */ |
| 1316 | while (nr_pages--) { |
Lai Jiangshan | 8cebfcd | 2012-12-12 13:51:36 -0800 | [diff] [blame] | 1317 | if (!free_pool_huge_page(h, &node_states[N_MEMORY], 1)) |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 1318 | break; |
Mizuma, Masayoshi | 7848a4b | 2014-04-18 15:07:18 -0700 | [diff] [blame] | 1319 | cond_resched_lock(&hugetlb_lock); |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 1320 | } |
| 1321 | } |
| 1322 | |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1323 | /* |
| 1324 | * Determine if the huge page at addr within the vma has an associated |
| 1325 | * reservation. Where it does not we will need to logically increase |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 1326 | * reservation and actually increase subpool usage before an allocation |
| 1327 | * can occur. Where any new reservation would be required the |
| 1328 | * reservation change is prepared, but not committed. Once the page |
| 1329 | * has been allocated from the subpool and instantiated the change should |
| 1330 | * be committed via vma_commit_reservation. No action is required on |
| 1331 | * failure. |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1332 | */ |
Roel Kluin | e2f17d9 | 2009-03-31 15:23:15 -0700 | [diff] [blame] | 1333 | static long vma_needs_reservation(struct hstate *h, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1334 | struct vm_area_struct *vma, unsigned long addr) |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1335 | { |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 1336 | struct resv_map *resv; |
| 1337 | pgoff_t idx; |
| 1338 | long chg; |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1339 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 1340 | resv = vma_resv_map(vma); |
| 1341 | if (!resv) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 1342 | return 1; |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1343 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 1344 | idx = vma_hugecache_offset(h, vma, addr); |
| 1345 | chg = region_chg(resv, idx, idx + 1); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 1346 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 1347 | if (vma->vm_flags & VM_MAYSHARE) |
| 1348 | return chg; |
| 1349 | else |
| 1350 | return chg < 0 ? chg : 0; |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1351 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1352 | static void vma_commit_reservation(struct hstate *h, |
| 1353 | struct vm_area_struct *vma, unsigned long addr) |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1354 | { |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 1355 | struct resv_map *resv; |
| 1356 | pgoff_t idx; |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1357 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 1358 | resv = vma_resv_map(vma); |
| 1359 | if (!resv) |
| 1360 | return; |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 1361 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 1362 | idx = vma_hugecache_offset(h, vma, addr); |
| 1363 | region_add(resv, idx, idx + 1); |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1364 | } |
| 1365 | |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 1366 | static struct page *alloc_huge_page(struct vm_area_struct *vma, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1367 | unsigned long addr, int avoid_reserve) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | { |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 1369 | struct hugepage_subpool *spool = subpool_vma(vma); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1370 | struct hstate *h = hstate_vma(vma); |
Adam Litke | 348ea20 | 2007-11-14 16:59:37 -0800 | [diff] [blame] | 1371 | struct page *page; |
Roel Kluin | e2f17d9 | 2009-03-31 15:23:15 -0700 | [diff] [blame] | 1372 | long chg; |
Aneesh Kumar K.V | 6d76dcf | 2012-07-31 16:42:18 -0700 | [diff] [blame] | 1373 | int ret, idx; |
| 1374 | struct hugetlb_cgroup *h_cg; |
Adam Litke | 2fc39ce | 2007-11-14 16:59:39 -0800 | [diff] [blame] | 1375 | |
Aneesh Kumar K.V | 6d76dcf | 2012-07-31 16:42:18 -0700 | [diff] [blame] | 1376 | idx = hstate_index(h); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1377 | /* |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 1378 | * Processes that did not create the mapping will have no |
| 1379 | * reserves and will not have accounted against subpool |
| 1380 | * limit. Check that the subpool limit can be made before |
| 1381 | * satisfying the allocation MAP_NORESERVE mappings may also |
| 1382 | * need pages and subpool limit allocated allocated if no reserve |
| 1383 | * mapping overlaps. |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1384 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1385 | chg = vma_needs_reservation(h, vma, addr); |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1386 | if (chg < 0) |
Aneesh Kumar K.V | 76dcee7 | 2012-07-31 16:41:57 -0700 | [diff] [blame] | 1387 | return ERR_PTR(-ENOMEM); |
Joonsoo Kim | 8bb3f12 | 2013-09-11 14:21:54 -0700 | [diff] [blame] | 1388 | if (chg || avoid_reserve) |
| 1389 | if (hugepage_subpool_get_pages(spool, 1)) |
Aneesh Kumar K.V | 76dcee7 | 2012-07-31 16:41:57 -0700 | [diff] [blame] | 1390 | return ERR_PTR(-ENOSPC); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1391 | |
Aneesh Kumar K.V | 6d76dcf | 2012-07-31 16:42:18 -0700 | [diff] [blame] | 1392 | ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg); |
Jianyu Zhan | 8f34af6 | 2014-06-04 16:10:36 -0700 | [diff] [blame] | 1393 | if (ret) |
| 1394 | goto out_subpool_put; |
| 1395 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1396 | spin_lock(&hugetlb_lock); |
Joonsoo Kim | af0ed73 | 2013-09-11 14:21:18 -0700 | [diff] [blame] | 1397 | page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve, chg); |
Joonsoo Kim | 81a6fca | 2013-09-11 14:20:58 -0700 | [diff] [blame] | 1398 | if (!page) { |
Aneesh Kumar K.V | 94ae8ba | 2012-07-31 16:42:35 -0700 | [diff] [blame] | 1399 | spin_unlock(&hugetlb_lock); |
Naoya Horiguchi | bf50bab | 2010-09-08 10:19:33 +0900 | [diff] [blame] | 1400 | page = alloc_buddy_huge_page(h, NUMA_NO_NODE); |
Jianyu Zhan | 8f34af6 | 2014-06-04 16:10:36 -0700 | [diff] [blame] | 1401 | if (!page) |
| 1402 | goto out_uncharge_cgroup; |
| 1403 | |
Aneesh Kumar K.V | 79dbb23 | 2012-07-31 16:42:32 -0700 | [diff] [blame] | 1404 | spin_lock(&hugetlb_lock); |
| 1405 | list_move(&page->lru, &h->hugepage_activelist); |
Joonsoo Kim | 81a6fca | 2013-09-11 14:20:58 -0700 | [diff] [blame] | 1406 | /* Fall through */ |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1407 | } |
Joonsoo Kim | 81a6fca | 2013-09-11 14:20:58 -0700 | [diff] [blame] | 1408 | hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page); |
| 1409 | spin_unlock(&hugetlb_lock); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1410 | |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 1411 | set_page_private(page, (unsigned long)spool); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1412 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1413 | vma_commit_reservation(h, vma, addr); |
Adam Litke | 90d8b7e | 2007-11-14 16:59:42 -0800 | [diff] [blame] | 1414 | return page; |
Jianyu Zhan | 8f34af6 | 2014-06-04 16:10:36 -0700 | [diff] [blame] | 1415 | |
| 1416 | out_uncharge_cgroup: |
| 1417 | hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg); |
| 1418 | out_subpool_put: |
| 1419 | if (chg || avoid_reserve) |
| 1420 | hugepage_subpool_put_pages(spool, 1); |
| 1421 | return ERR_PTR(-ENOSPC); |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 1422 | } |
| 1423 | |
Naoya Horiguchi | 74060e4 | 2013-09-11 14:22:06 -0700 | [diff] [blame] | 1424 | /* |
| 1425 | * alloc_huge_page()'s wrapper which simply returns the page if allocation |
| 1426 | * succeeds, otherwise NULL. This function is called from new_vma_page(), |
| 1427 | * where no ERR_VALUE is expected to be returned. |
| 1428 | */ |
| 1429 | struct page *alloc_huge_page_noerr(struct vm_area_struct *vma, |
| 1430 | unsigned long addr, int avoid_reserve) |
| 1431 | { |
| 1432 | struct page *page = alloc_huge_page(vma, addr, avoid_reserve); |
| 1433 | if (IS_ERR(page)) |
| 1434 | page = NULL; |
| 1435 | return page; |
| 1436 | } |
| 1437 | |
Cyrill Gorcunov | 91f4766 | 2009-01-06 14:40:33 -0800 | [diff] [blame] | 1438 | int __weak alloc_bootmem_huge_page(struct hstate *h) |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1439 | { |
| 1440 | struct huge_bootmem_page *m; |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1441 | int nr_nodes, node; |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1442 | |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1443 | for_each_node_mask_to_alloc(h, nr_nodes, node, &node_states[N_MEMORY]) { |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1444 | void *addr; |
| 1445 | |
Grygorii Strashko | 8b89a11 | 2014-01-21 15:50:36 -0800 | [diff] [blame] | 1446 | addr = memblock_virt_alloc_try_nid_nopanic( |
| 1447 | huge_page_size(h), huge_page_size(h), |
| 1448 | 0, BOOTMEM_ALLOC_ACCESSIBLE, node); |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1449 | if (addr) { |
| 1450 | /* |
| 1451 | * Use the beginning of the huge page to store the |
| 1452 | * huge_bootmem_page struct (until gather_bootmem |
| 1453 | * puts them into the mem_map). |
| 1454 | */ |
| 1455 | m = addr; |
Cyrill Gorcunov | 91f4766 | 2009-01-06 14:40:33 -0800 | [diff] [blame] | 1456 | goto found; |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1457 | } |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1458 | } |
| 1459 | return 0; |
| 1460 | |
| 1461 | found: |
Luiz Capitulino | df994ea | 2014-12-12 16:55:21 -0800 | [diff] [blame] | 1462 | BUG_ON(!IS_ALIGNED(virt_to_phys(m), huge_page_size(h))); |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1463 | /* Put them into a private list first because mem_map is not up yet */ |
| 1464 | list_add(&m->list, &huge_boot_pages); |
| 1465 | m->hstate = h; |
| 1466 | return 1; |
| 1467 | } |
| 1468 | |
David Rientjes | f412c97 | 2014-04-03 14:47:59 -0700 | [diff] [blame] | 1469 | static void __init prep_compound_huge_page(struct page *page, int order) |
Andy Whitcroft | 18229df | 2008-11-06 12:53:27 -0800 | [diff] [blame] | 1470 | { |
| 1471 | if (unlikely(order > (MAX_ORDER - 1))) |
| 1472 | prep_compound_gigantic_page(page, order); |
| 1473 | else |
| 1474 | prep_compound_page(page, order); |
| 1475 | } |
| 1476 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1477 | /* Put bootmem huge pages into the standard lists after mem_map is up */ |
| 1478 | static void __init gather_bootmem_prealloc(void) |
| 1479 | { |
| 1480 | struct huge_bootmem_page *m; |
| 1481 | |
| 1482 | list_for_each_entry(m, &huge_boot_pages, list) { |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1483 | struct hstate *h = m->hstate; |
Becky Bruce | ee8f248 | 2011-07-25 17:11:50 -0700 | [diff] [blame] | 1484 | struct page *page; |
| 1485 | |
| 1486 | #ifdef CONFIG_HIGHMEM |
| 1487 | page = pfn_to_page(m->phys >> PAGE_SHIFT); |
Grygorii Strashko | 8b89a11 | 2014-01-21 15:50:36 -0800 | [diff] [blame] | 1488 | memblock_free_late(__pa(m), |
| 1489 | sizeof(struct huge_bootmem_page)); |
Becky Bruce | ee8f248 | 2011-07-25 17:11:50 -0700 | [diff] [blame] | 1490 | #else |
| 1491 | page = virt_to_page(m); |
| 1492 | #endif |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1493 | WARN_ON(page_count(page) != 1); |
Andy Whitcroft | 18229df | 2008-11-06 12:53:27 -0800 | [diff] [blame] | 1494 | prep_compound_huge_page(page, h->order); |
Andrea Arcangeli | ef5a22b | 2013-10-16 13:46:56 -0700 | [diff] [blame] | 1495 | WARN_ON(PageReserved(page)); |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1496 | prep_new_huge_page(h, page, page_to_nid(page)); |
Rafael Aquini | b0320c7 | 2011-06-15 15:08:39 -0700 | [diff] [blame] | 1497 | /* |
| 1498 | * If we had gigantic hugepages allocated at boot time, we need |
| 1499 | * to restore the 'stolen' pages to totalram_pages in order to |
| 1500 | * fix confusing memory reports from free(1) and another |
| 1501 | * side-effects, like CommitLimit going negative. |
| 1502 | */ |
Luiz Capitulino | bae7f4a | 2014-06-04 16:07:08 -0700 | [diff] [blame] | 1503 | if (hstate_is_gigantic(h)) |
Jiang Liu | 3dcc057 | 2013-07-03 15:03:21 -0700 | [diff] [blame] | 1504 | adjust_managed_page_count(page, 1 << h->order); |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1505 | } |
| 1506 | } |
| 1507 | |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1508 | static void __init hugetlb_hstate_alloc_pages(struct hstate *h) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | { |
| 1510 | unsigned long i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1512 | for (i = 0; i < h->max_huge_pages; ++i) { |
Luiz Capitulino | bae7f4a | 2014-06-04 16:07:08 -0700 | [diff] [blame] | 1513 | if (hstate_is_gigantic(h)) { |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1514 | if (!alloc_bootmem_huge_page(h)) |
| 1515 | break; |
Lee Schermerhorn | 9b5e5d0 | 2009-12-14 17:58:32 -0800 | [diff] [blame] | 1516 | } else if (!alloc_fresh_huge_page(h, |
Lai Jiangshan | 8cebfcd | 2012-12-12 13:51:36 -0800 | [diff] [blame] | 1517 | &node_states[N_MEMORY])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | } |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1520 | h->max_huge_pages = i; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1521 | } |
| 1522 | |
| 1523 | static void __init hugetlb_init_hstates(void) |
| 1524 | { |
| 1525 | struct hstate *h; |
| 1526 | |
| 1527 | for_each_hstate(h) { |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1528 | /* oversize hugepages were init'ed in early boot */ |
Luiz Capitulino | bae7f4a | 2014-06-04 16:07:08 -0700 | [diff] [blame] | 1529 | if (!hstate_is_gigantic(h)) |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1530 | hugetlb_hstate_alloc_pages(h); |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1531 | } |
| 1532 | } |
| 1533 | |
Andi Kleen | 4abd32d | 2008-07-23 21:27:49 -0700 | [diff] [blame] | 1534 | static char * __init memfmt(char *buf, unsigned long n) |
| 1535 | { |
| 1536 | if (n >= (1UL << 30)) |
| 1537 | sprintf(buf, "%lu GB", n >> 30); |
| 1538 | else if (n >= (1UL << 20)) |
| 1539 | sprintf(buf, "%lu MB", n >> 20); |
| 1540 | else |
| 1541 | sprintf(buf, "%lu KB", n >> 10); |
| 1542 | return buf; |
| 1543 | } |
| 1544 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1545 | static void __init report_hugepages(void) |
| 1546 | { |
| 1547 | struct hstate *h; |
| 1548 | |
| 1549 | for_each_hstate(h) { |
Andi Kleen | 4abd32d | 2008-07-23 21:27:49 -0700 | [diff] [blame] | 1550 | char buf[32]; |
Andrew Morton | ffb22af | 2013-02-22 16:32:08 -0800 | [diff] [blame] | 1551 | pr_info("HugeTLB registered %s page size, pre-allocated %ld pages\n", |
Andi Kleen | 4abd32d | 2008-07-23 21:27:49 -0700 | [diff] [blame] | 1552 | memfmt(buf, huge_page_size(h)), |
| 1553 | h->free_huge_pages); |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1554 | } |
| 1555 | } |
| 1556 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | #ifdef CONFIG_HIGHMEM |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1558 | static void try_to_free_low(struct hstate *h, unsigned long count, |
| 1559 | nodemask_t *nodes_allowed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | { |
Christoph Lameter | 4415cc8 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 1561 | int i; |
| 1562 | |
Luiz Capitulino | bae7f4a | 2014-06-04 16:07:08 -0700 | [diff] [blame] | 1563 | if (hstate_is_gigantic(h)) |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1564 | return; |
| 1565 | |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1566 | for_each_node_mask(i, *nodes_allowed) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | struct page *page, *next; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1568 | struct list_head *freel = &h->hugepage_freelists[i]; |
| 1569 | list_for_each_entry_safe(page, next, freel, lru) { |
| 1570 | if (count >= h->nr_huge_pages) |
Adam Litke | 6b0c880 | 2007-10-16 01:26:23 -0700 | [diff] [blame] | 1571 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | if (PageHighMem(page)) |
| 1573 | continue; |
| 1574 | list_del(&page->lru); |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1575 | update_and_free_page(h, page); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1576 | h->free_huge_pages--; |
| 1577 | h->free_huge_pages_node[page_to_nid(page)]--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | } |
| 1579 | } |
| 1580 | } |
| 1581 | #else |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1582 | static inline void try_to_free_low(struct hstate *h, unsigned long count, |
| 1583 | nodemask_t *nodes_allowed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | { |
| 1585 | } |
| 1586 | #endif |
| 1587 | |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1588 | /* |
| 1589 | * Increment or decrement surplus_huge_pages. Keep node-specific counters |
| 1590 | * balanced by operating on them in a round-robin fashion. |
| 1591 | * Returns 1 if an adjustment was made. |
| 1592 | */ |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1593 | static int adjust_pool_surplus(struct hstate *h, nodemask_t *nodes_allowed, |
| 1594 | int delta) |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1595 | { |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1596 | int nr_nodes, node; |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1597 | |
| 1598 | VM_BUG_ON(delta != -1 && delta != 1); |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1599 | |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1600 | if (delta < 0) { |
| 1601 | for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) { |
| 1602 | if (h->surplus_huge_pages_node[node]) |
| 1603 | goto found; |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1604 | } |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1605 | } else { |
| 1606 | for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) { |
| 1607 | if (h->surplus_huge_pages_node[node] < |
| 1608 | h->nr_huge_pages_node[node]) |
| 1609 | goto found; |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1610 | } |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1611 | } |
| 1612 | return 0; |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1613 | |
Joonsoo Kim | b226102 | 2013-09-11 14:21:00 -0700 | [diff] [blame] | 1614 | found: |
| 1615 | h->surplus_huge_pages += delta; |
| 1616 | h->surplus_huge_pages_node[node] += delta; |
| 1617 | return 1; |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1618 | } |
| 1619 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1620 | #define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages) |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1621 | static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count, |
| 1622 | nodemask_t *nodes_allowed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | { |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1624 | unsigned long min_count, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | |
Luiz Capitulino | 944d9fe | 2014-06-04 16:07:13 -0700 | [diff] [blame] | 1626 | if (hstate_is_gigantic(h) && !gigantic_page_supported()) |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1627 | return h->max_huge_pages; |
| 1628 | |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1629 | /* |
| 1630 | * Increase the pool size |
| 1631 | * First take pages out of surplus state. Then make up the |
| 1632 | * remaining difference by allocating fresh huge pages. |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1633 | * |
| 1634 | * We might race with alloc_buddy_huge_page() here and be unable |
| 1635 | * to convert a surplus huge page to a normal huge page. That is |
| 1636 | * not critical, though, it just means the overall size of the |
| 1637 | * pool might be one hugepage larger than it needs to be, but |
| 1638 | * within all the constraints specified by the sysctls. |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1639 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | spin_lock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1641 | while (h->surplus_huge_pages && count > persistent_huge_pages(h)) { |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1642 | if (!adjust_pool_surplus(h, nodes_allowed, -1)) |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1643 | break; |
| 1644 | } |
| 1645 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1646 | while (count > persistent_huge_pages(h)) { |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1647 | /* |
| 1648 | * If this allocation races such that we no longer need the |
| 1649 | * page, free_huge_page will handle it by freeing the page |
| 1650 | * and reducing the surplus. |
| 1651 | */ |
| 1652 | spin_unlock(&hugetlb_lock); |
Luiz Capitulino | 944d9fe | 2014-06-04 16:07:13 -0700 | [diff] [blame] | 1653 | if (hstate_is_gigantic(h)) |
| 1654 | ret = alloc_fresh_gigantic_page(h, nodes_allowed); |
| 1655 | else |
| 1656 | ret = alloc_fresh_huge_page(h, nodes_allowed); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1657 | spin_lock(&hugetlb_lock); |
| 1658 | if (!ret) |
| 1659 | goto out; |
| 1660 | |
Mel Gorman | 536240f2 | 2009-12-14 17:59:56 -0800 | [diff] [blame] | 1661 | /* Bail for signals. Probably ctrl-c from user */ |
| 1662 | if (signal_pending(current)) |
| 1663 | goto out; |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1664 | } |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1665 | |
| 1666 | /* |
| 1667 | * Decrease the pool size |
| 1668 | * First return free pages to the buddy allocator (being careful |
| 1669 | * to keep enough around to satisfy reservations). Then place |
| 1670 | * pages into surplus state as needed so the pool will shrink |
| 1671 | * to the desired size as pages become free. |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1672 | * |
| 1673 | * By placing pages into the surplus state independent of the |
| 1674 | * overcommit value, we are allowing the surplus pool size to |
| 1675 | * exceed overcommit. There are few sane options here. Since |
| 1676 | * alloc_buddy_huge_page() is checking the global counter, |
| 1677 | * though, we'll note that we're not allowed to exceed surplus |
| 1678 | * and won't grow the pool anywhere else. Not until one of the |
| 1679 | * sysctls are changed, or the surplus pages go out of use. |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1680 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1681 | min_count = h->resv_huge_pages + h->nr_huge_pages - h->free_huge_pages; |
Adam Litke | 6b0c880 | 2007-10-16 01:26:23 -0700 | [diff] [blame] | 1682 | min_count = max(count, min_count); |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1683 | try_to_free_low(h, min_count, nodes_allowed); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1684 | while (min_count < persistent_huge_pages(h)) { |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1685 | if (!free_pool_huge_page(h, nodes_allowed, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | break; |
Mizuma, Masayoshi | 55f6714 | 2014-04-07 15:37:54 -0700 | [diff] [blame] | 1687 | cond_resched_lock(&hugetlb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1689 | while (count < persistent_huge_pages(h)) { |
Lee Schermerhorn | 6ae11b2 | 2009-12-14 17:58:16 -0800 | [diff] [blame] | 1690 | if (!adjust_pool_surplus(h, nodes_allowed, 1)) |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1691 | break; |
| 1692 | } |
| 1693 | out: |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1694 | ret = persistent_huge_pages(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | spin_unlock(&hugetlb_lock); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1696 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | } |
| 1698 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1699 | #define HSTATE_ATTR_RO(_name) \ |
| 1700 | static struct kobj_attribute _name##_attr = __ATTR_RO(_name) |
| 1701 | |
| 1702 | #define HSTATE_ATTR(_name) \ |
| 1703 | static struct kobj_attribute _name##_attr = \ |
| 1704 | __ATTR(_name, 0644, _name##_show, _name##_store) |
| 1705 | |
| 1706 | static struct kobject *hugepages_kobj; |
| 1707 | static struct kobject *hstate_kobjs[HUGE_MAX_HSTATE]; |
| 1708 | |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1709 | static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp); |
| 1710 | |
| 1711 | static struct hstate *kobj_to_hstate(struct kobject *kobj, int *nidp) |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1712 | { |
| 1713 | int i; |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1714 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1715 | for (i = 0; i < HUGE_MAX_HSTATE; i++) |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1716 | if (hstate_kobjs[i] == kobj) { |
| 1717 | if (nidp) |
| 1718 | *nidp = NUMA_NO_NODE; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1719 | return &hstates[i]; |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1720 | } |
| 1721 | |
| 1722 | return kobj_to_node_hstate(kobj, nidp); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1723 | } |
| 1724 | |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1725 | static ssize_t nr_hugepages_show_common(struct kobject *kobj, |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1726 | struct kobj_attribute *attr, char *buf) |
| 1727 | { |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1728 | struct hstate *h; |
| 1729 | unsigned long nr_huge_pages; |
| 1730 | int nid; |
| 1731 | |
| 1732 | h = kobj_to_hstate(kobj, &nid); |
| 1733 | if (nid == NUMA_NO_NODE) |
| 1734 | nr_huge_pages = h->nr_huge_pages; |
| 1735 | else |
| 1736 | nr_huge_pages = h->nr_huge_pages_node[nid]; |
| 1737 | |
| 1738 | return sprintf(buf, "%lu\n", nr_huge_pages); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1739 | } |
Eric B Munson | adbe872 | 2011-01-13 15:47:27 -0800 | [diff] [blame] | 1740 | |
David Rientjes | 238d3c1 | 2014-08-06 16:06:51 -0700 | [diff] [blame] | 1741 | static ssize_t __nr_hugepages_store_common(bool obey_mempolicy, |
| 1742 | struct hstate *h, int nid, |
| 1743 | unsigned long count, size_t len) |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1744 | { |
| 1745 | int err; |
David Rientjes | bad44b5 | 2009-12-14 17:58:38 -0800 | [diff] [blame] | 1746 | NODEMASK_ALLOC(nodemask_t, nodes_allowed, GFP_KERNEL | __GFP_NORETRY); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1747 | |
Luiz Capitulino | 944d9fe | 2014-06-04 16:07:13 -0700 | [diff] [blame] | 1748 | if (hstate_is_gigantic(h) && !gigantic_page_supported()) { |
Eric B Munson | adbe872 | 2011-01-13 15:47:27 -0800 | [diff] [blame] | 1749 | err = -EINVAL; |
| 1750 | goto out; |
| 1751 | } |
| 1752 | |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1753 | if (nid == NUMA_NO_NODE) { |
| 1754 | /* |
| 1755 | * global hstate attribute |
| 1756 | */ |
| 1757 | if (!(obey_mempolicy && |
| 1758 | init_nodemask_of_mempolicy(nodes_allowed))) { |
| 1759 | NODEMASK_FREE(nodes_allowed); |
Lai Jiangshan | 8cebfcd | 2012-12-12 13:51:36 -0800 | [diff] [blame] | 1760 | nodes_allowed = &node_states[N_MEMORY]; |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1761 | } |
| 1762 | } else if (nodes_allowed) { |
| 1763 | /* |
| 1764 | * per node hstate attribute: adjust count to global, |
| 1765 | * but restrict alloc/free to the specified node. |
| 1766 | */ |
| 1767 | count += h->nr_huge_pages - h->nr_huge_pages_node[nid]; |
| 1768 | init_nodemask_of_node(nodes_allowed, nid); |
| 1769 | } else |
Lai Jiangshan | 8cebfcd | 2012-12-12 13:51:36 -0800 | [diff] [blame] | 1770 | nodes_allowed = &node_states[N_MEMORY]; |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1771 | |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1772 | h->max_huge_pages = set_max_huge_pages(h, count, nodes_allowed); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1773 | |
Lai Jiangshan | 8cebfcd | 2012-12-12 13:51:36 -0800 | [diff] [blame] | 1774 | if (nodes_allowed != &node_states[N_MEMORY]) |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1775 | NODEMASK_FREE(nodes_allowed); |
| 1776 | |
| 1777 | return len; |
Eric B Munson | adbe872 | 2011-01-13 15:47:27 -0800 | [diff] [blame] | 1778 | out: |
| 1779 | NODEMASK_FREE(nodes_allowed); |
| 1780 | return err; |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1781 | } |
| 1782 | |
David Rientjes | 238d3c1 | 2014-08-06 16:06:51 -0700 | [diff] [blame] | 1783 | static ssize_t nr_hugepages_store_common(bool obey_mempolicy, |
| 1784 | struct kobject *kobj, const char *buf, |
| 1785 | size_t len) |
| 1786 | { |
| 1787 | struct hstate *h; |
| 1788 | unsigned long count; |
| 1789 | int nid; |
| 1790 | int err; |
| 1791 | |
| 1792 | err = kstrtoul(buf, 10, &count); |
| 1793 | if (err) |
| 1794 | return err; |
| 1795 | |
| 1796 | h = kobj_to_hstate(kobj, &nid); |
| 1797 | return __nr_hugepages_store_common(obey_mempolicy, h, nid, count, len); |
| 1798 | } |
| 1799 | |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1800 | static ssize_t nr_hugepages_show(struct kobject *kobj, |
| 1801 | struct kobj_attribute *attr, char *buf) |
| 1802 | { |
| 1803 | return nr_hugepages_show_common(kobj, attr, buf); |
| 1804 | } |
| 1805 | |
| 1806 | static ssize_t nr_hugepages_store(struct kobject *kobj, |
| 1807 | struct kobj_attribute *attr, const char *buf, size_t len) |
| 1808 | { |
David Rientjes | 238d3c1 | 2014-08-06 16:06:51 -0700 | [diff] [blame] | 1809 | return nr_hugepages_store_common(false, kobj, buf, len); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1810 | } |
| 1811 | HSTATE_ATTR(nr_hugepages); |
| 1812 | |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1813 | #ifdef CONFIG_NUMA |
| 1814 | |
| 1815 | /* |
| 1816 | * hstate attribute for optionally mempolicy-based constraint on persistent |
| 1817 | * huge page alloc/free. |
| 1818 | */ |
| 1819 | static ssize_t nr_hugepages_mempolicy_show(struct kobject *kobj, |
| 1820 | struct kobj_attribute *attr, char *buf) |
| 1821 | { |
| 1822 | return nr_hugepages_show_common(kobj, attr, buf); |
| 1823 | } |
| 1824 | |
| 1825 | static ssize_t nr_hugepages_mempolicy_store(struct kobject *kobj, |
| 1826 | struct kobj_attribute *attr, const char *buf, size_t len) |
| 1827 | { |
David Rientjes | 238d3c1 | 2014-08-06 16:06:51 -0700 | [diff] [blame] | 1828 | return nr_hugepages_store_common(true, kobj, buf, len); |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1829 | } |
| 1830 | HSTATE_ATTR(nr_hugepages_mempolicy); |
| 1831 | #endif |
| 1832 | |
| 1833 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1834 | static ssize_t nr_overcommit_hugepages_show(struct kobject *kobj, |
| 1835 | struct kobj_attribute *attr, char *buf) |
| 1836 | { |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1837 | struct hstate *h = kobj_to_hstate(kobj, NULL); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1838 | return sprintf(buf, "%lu\n", h->nr_overcommit_huge_pages); |
| 1839 | } |
Eric B Munson | adbe872 | 2011-01-13 15:47:27 -0800 | [diff] [blame] | 1840 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1841 | static ssize_t nr_overcommit_hugepages_store(struct kobject *kobj, |
| 1842 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1843 | { |
| 1844 | int err; |
| 1845 | unsigned long input; |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1846 | struct hstate *h = kobj_to_hstate(kobj, NULL); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1847 | |
Luiz Capitulino | bae7f4a | 2014-06-04 16:07:08 -0700 | [diff] [blame] | 1848 | if (hstate_is_gigantic(h)) |
Eric B Munson | adbe872 | 2011-01-13 15:47:27 -0800 | [diff] [blame] | 1849 | return -EINVAL; |
| 1850 | |
Jingoo Han | 3dbb95f | 2013-09-11 14:20:25 -0700 | [diff] [blame] | 1851 | err = kstrtoul(buf, 10, &input); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1852 | if (err) |
Eric B Munson | 73ae31e | 2011-01-13 15:47:28 -0800 | [diff] [blame] | 1853 | return err; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1854 | |
| 1855 | spin_lock(&hugetlb_lock); |
| 1856 | h->nr_overcommit_huge_pages = input; |
| 1857 | spin_unlock(&hugetlb_lock); |
| 1858 | |
| 1859 | return count; |
| 1860 | } |
| 1861 | HSTATE_ATTR(nr_overcommit_hugepages); |
| 1862 | |
| 1863 | static ssize_t free_hugepages_show(struct kobject *kobj, |
| 1864 | struct kobj_attribute *attr, char *buf) |
| 1865 | { |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1866 | struct hstate *h; |
| 1867 | unsigned long free_huge_pages; |
| 1868 | int nid; |
| 1869 | |
| 1870 | h = kobj_to_hstate(kobj, &nid); |
| 1871 | if (nid == NUMA_NO_NODE) |
| 1872 | free_huge_pages = h->free_huge_pages; |
| 1873 | else |
| 1874 | free_huge_pages = h->free_huge_pages_node[nid]; |
| 1875 | |
| 1876 | return sprintf(buf, "%lu\n", free_huge_pages); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1877 | } |
| 1878 | HSTATE_ATTR_RO(free_hugepages); |
| 1879 | |
| 1880 | static ssize_t resv_hugepages_show(struct kobject *kobj, |
| 1881 | struct kobj_attribute *attr, char *buf) |
| 1882 | { |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1883 | struct hstate *h = kobj_to_hstate(kobj, NULL); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1884 | return sprintf(buf, "%lu\n", h->resv_huge_pages); |
| 1885 | } |
| 1886 | HSTATE_ATTR_RO(resv_hugepages); |
| 1887 | |
| 1888 | static ssize_t surplus_hugepages_show(struct kobject *kobj, |
| 1889 | struct kobj_attribute *attr, char *buf) |
| 1890 | { |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1891 | struct hstate *h; |
| 1892 | unsigned long surplus_huge_pages; |
| 1893 | int nid; |
| 1894 | |
| 1895 | h = kobj_to_hstate(kobj, &nid); |
| 1896 | if (nid == NUMA_NO_NODE) |
| 1897 | surplus_huge_pages = h->surplus_huge_pages; |
| 1898 | else |
| 1899 | surplus_huge_pages = h->surplus_huge_pages_node[nid]; |
| 1900 | |
| 1901 | return sprintf(buf, "%lu\n", surplus_huge_pages); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1902 | } |
| 1903 | HSTATE_ATTR_RO(surplus_hugepages); |
| 1904 | |
| 1905 | static struct attribute *hstate_attrs[] = { |
| 1906 | &nr_hugepages_attr.attr, |
| 1907 | &nr_overcommit_hugepages_attr.attr, |
| 1908 | &free_hugepages_attr.attr, |
| 1909 | &resv_hugepages_attr.attr, |
| 1910 | &surplus_hugepages_attr.attr, |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1911 | #ifdef CONFIG_NUMA |
| 1912 | &nr_hugepages_mempolicy_attr.attr, |
| 1913 | #endif |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1914 | NULL, |
| 1915 | }; |
| 1916 | |
| 1917 | static struct attribute_group hstate_attr_group = { |
| 1918 | .attrs = hstate_attrs, |
| 1919 | }; |
| 1920 | |
Jeff Mahoney | 094e953 | 2010-02-02 13:44:14 -0800 | [diff] [blame] | 1921 | static int hugetlb_sysfs_add_hstate(struct hstate *h, struct kobject *parent, |
| 1922 | struct kobject **hstate_kobjs, |
| 1923 | struct attribute_group *hstate_attr_group) |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1924 | { |
| 1925 | int retval; |
Aneesh Kumar K.V | 972dc4d | 2012-07-31 16:42:00 -0700 | [diff] [blame] | 1926 | int hi = hstate_index(h); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1927 | |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1928 | hstate_kobjs[hi] = kobject_create_and_add(h->name, parent); |
| 1929 | if (!hstate_kobjs[hi]) |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1930 | return -ENOMEM; |
| 1931 | |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1932 | retval = sysfs_create_group(hstate_kobjs[hi], hstate_attr_group); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1933 | if (retval) |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1934 | kobject_put(hstate_kobjs[hi]); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1935 | |
| 1936 | return retval; |
| 1937 | } |
| 1938 | |
| 1939 | static void __init hugetlb_sysfs_init(void) |
| 1940 | { |
| 1941 | struct hstate *h; |
| 1942 | int err; |
| 1943 | |
| 1944 | hugepages_kobj = kobject_create_and_add("hugepages", mm_kobj); |
| 1945 | if (!hugepages_kobj) |
| 1946 | return; |
| 1947 | |
| 1948 | for_each_hstate(h) { |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1949 | err = hugetlb_sysfs_add_hstate(h, hugepages_kobj, |
| 1950 | hstate_kobjs, &hstate_attr_group); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1951 | if (err) |
Andrew Morton | ffb22af | 2013-02-22 16:32:08 -0800 | [diff] [blame] | 1952 | pr_err("Hugetlb: Unable to add hstate %s", h->name); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1953 | } |
| 1954 | } |
| 1955 | |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1956 | #ifdef CONFIG_NUMA |
| 1957 | |
| 1958 | /* |
| 1959 | * node_hstate/s - associate per node hstate attributes, via their kobjects, |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 1960 | * with node devices in node_devices[] using a parallel array. The array |
| 1961 | * index of a node device or _hstate == node id. |
| 1962 | * This is here to avoid any static dependency of the node device driver, in |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1963 | * the base kernel, on the hugetlb module. |
| 1964 | */ |
| 1965 | struct node_hstate { |
| 1966 | struct kobject *hugepages_kobj; |
| 1967 | struct kobject *hstate_kobjs[HUGE_MAX_HSTATE]; |
| 1968 | }; |
| 1969 | struct node_hstate node_hstates[MAX_NUMNODES]; |
| 1970 | |
| 1971 | /* |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 1972 | * A subset of global hstate attributes for node devices |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1973 | */ |
| 1974 | static struct attribute *per_node_hstate_attrs[] = { |
| 1975 | &nr_hugepages_attr.attr, |
| 1976 | &free_hugepages_attr.attr, |
| 1977 | &surplus_hugepages_attr.attr, |
| 1978 | NULL, |
| 1979 | }; |
| 1980 | |
| 1981 | static struct attribute_group per_node_hstate_attr_group = { |
| 1982 | .attrs = per_node_hstate_attrs, |
| 1983 | }; |
| 1984 | |
| 1985 | /* |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 1986 | * kobj_to_node_hstate - lookup global hstate for node device hstate attr kobj. |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 1987 | * Returns node id via non-NULL nidp. |
| 1988 | */ |
| 1989 | static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp) |
| 1990 | { |
| 1991 | int nid; |
| 1992 | |
| 1993 | for (nid = 0; nid < nr_node_ids; nid++) { |
| 1994 | struct node_hstate *nhs = &node_hstates[nid]; |
| 1995 | int i; |
| 1996 | for (i = 0; i < HUGE_MAX_HSTATE; i++) |
| 1997 | if (nhs->hstate_kobjs[i] == kobj) { |
| 1998 | if (nidp) |
| 1999 | *nidp = nid; |
| 2000 | return &hstates[i]; |
| 2001 | } |
| 2002 | } |
| 2003 | |
| 2004 | BUG(); |
| 2005 | return NULL; |
| 2006 | } |
| 2007 | |
| 2008 | /* |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2009 | * Unregister hstate attributes from a single node device. |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2010 | * No-op if no hstate attributes attached. |
| 2011 | */ |
Claudiu Ghioc | 3cd8b44 | 2013-03-04 12:46:15 +0200 | [diff] [blame] | 2012 | static void hugetlb_unregister_node(struct node *node) |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2013 | { |
| 2014 | struct hstate *h; |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2015 | struct node_hstate *nhs = &node_hstates[node->dev.id]; |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2016 | |
| 2017 | if (!nhs->hugepages_kobj) |
Lee Schermerhorn | 9b5e5d0 | 2009-12-14 17:58:32 -0800 | [diff] [blame] | 2018 | return; /* no hstate attributes */ |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2019 | |
Aneesh Kumar K.V | 972dc4d | 2012-07-31 16:42:00 -0700 | [diff] [blame] | 2020 | for_each_hstate(h) { |
| 2021 | int idx = hstate_index(h); |
| 2022 | if (nhs->hstate_kobjs[idx]) { |
| 2023 | kobject_put(nhs->hstate_kobjs[idx]); |
| 2024 | nhs->hstate_kobjs[idx] = NULL; |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2025 | } |
Aneesh Kumar K.V | 972dc4d | 2012-07-31 16:42:00 -0700 | [diff] [blame] | 2026 | } |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2027 | |
| 2028 | kobject_put(nhs->hugepages_kobj); |
| 2029 | nhs->hugepages_kobj = NULL; |
| 2030 | } |
| 2031 | |
| 2032 | /* |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2033 | * hugetlb module exit: unregister hstate attributes from node devices |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2034 | * that have them. |
| 2035 | */ |
| 2036 | static void hugetlb_unregister_all_nodes(void) |
| 2037 | { |
| 2038 | int nid; |
| 2039 | |
| 2040 | /* |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2041 | * disable node device registrations. |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2042 | */ |
| 2043 | register_hugetlbfs_with_node(NULL, NULL); |
| 2044 | |
| 2045 | /* |
| 2046 | * remove hstate attributes from any nodes that have them. |
| 2047 | */ |
| 2048 | for (nid = 0; nid < nr_node_ids; nid++) |
Wen Congyang | 8732794 | 2012-12-11 16:00:56 -0800 | [diff] [blame] | 2049 | hugetlb_unregister_node(node_devices[nid]); |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2050 | } |
| 2051 | |
| 2052 | /* |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2053 | * Register hstate attributes for a single node device. |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2054 | * No-op if attributes already registered. |
| 2055 | */ |
Claudiu Ghioc | 3cd8b44 | 2013-03-04 12:46:15 +0200 | [diff] [blame] | 2056 | static void hugetlb_register_node(struct node *node) |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2057 | { |
| 2058 | struct hstate *h; |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2059 | struct node_hstate *nhs = &node_hstates[node->dev.id]; |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2060 | int err; |
| 2061 | |
| 2062 | if (nhs->hugepages_kobj) |
| 2063 | return; /* already allocated */ |
| 2064 | |
| 2065 | nhs->hugepages_kobj = kobject_create_and_add("hugepages", |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2066 | &node->dev.kobj); |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2067 | if (!nhs->hugepages_kobj) |
| 2068 | return; |
| 2069 | |
| 2070 | for_each_hstate(h) { |
| 2071 | err = hugetlb_sysfs_add_hstate(h, nhs->hugepages_kobj, |
| 2072 | nhs->hstate_kobjs, |
| 2073 | &per_node_hstate_attr_group); |
| 2074 | if (err) { |
Andrew Morton | ffb22af | 2013-02-22 16:32:08 -0800 | [diff] [blame] | 2075 | pr_err("Hugetlb: Unable to add hstate %s for node %d\n", |
| 2076 | h->name, node->dev.id); |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2077 | hugetlb_unregister_node(node); |
| 2078 | break; |
| 2079 | } |
| 2080 | } |
| 2081 | } |
| 2082 | |
| 2083 | /* |
Lee Schermerhorn | 9b5e5d0 | 2009-12-14 17:58:32 -0800 | [diff] [blame] | 2084 | * hugetlb init time: register hstate attributes for all registered node |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2085 | * devices of nodes that have memory. All on-line nodes should have |
| 2086 | * registered their associated device by this time. |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2087 | */ |
Luiz Capitulino | 7d9ca00 | 2014-12-12 16:55:24 -0800 | [diff] [blame] | 2088 | static void __init hugetlb_register_all_nodes(void) |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2089 | { |
| 2090 | int nid; |
| 2091 | |
Lai Jiangshan | 8cebfcd | 2012-12-12 13:51:36 -0800 | [diff] [blame] | 2092 | for_each_node_state(nid, N_MEMORY) { |
Wen Congyang | 8732794 | 2012-12-11 16:00:56 -0800 | [diff] [blame] | 2093 | struct node *node = node_devices[nid]; |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2094 | if (node->dev.id == nid) |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2095 | hugetlb_register_node(node); |
| 2096 | } |
| 2097 | |
| 2098 | /* |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2099 | * Let the node device driver know we're here so it can |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2100 | * [un]register hstate attributes on node hotplug. |
| 2101 | */ |
| 2102 | register_hugetlbfs_with_node(hugetlb_register_node, |
| 2103 | hugetlb_unregister_node); |
| 2104 | } |
| 2105 | #else /* !CONFIG_NUMA */ |
| 2106 | |
| 2107 | static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp) |
| 2108 | { |
| 2109 | BUG(); |
| 2110 | if (nidp) |
| 2111 | *nidp = -1; |
| 2112 | return NULL; |
| 2113 | } |
| 2114 | |
| 2115 | static void hugetlb_unregister_all_nodes(void) { } |
| 2116 | |
| 2117 | static void hugetlb_register_all_nodes(void) { } |
| 2118 | |
| 2119 | #endif |
| 2120 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2121 | static void __exit hugetlb_exit(void) |
| 2122 | { |
| 2123 | struct hstate *h; |
| 2124 | |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2125 | hugetlb_unregister_all_nodes(); |
| 2126 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2127 | for_each_hstate(h) { |
Aneesh Kumar K.V | 972dc4d | 2012-07-31 16:42:00 -0700 | [diff] [blame] | 2128 | kobject_put(hstate_kobjs[hstate_index(h)]); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2129 | } |
| 2130 | |
| 2131 | kobject_put(hugepages_kobj); |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 2132 | kfree(htlb_fault_mutex_table); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2133 | } |
| 2134 | module_exit(hugetlb_exit); |
| 2135 | |
| 2136 | static int __init hugetlb_init(void) |
| 2137 | { |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 2138 | int i; |
| 2139 | |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 2140 | if (!hugepages_supported()) |
Benjamin Herrenschmidt | 0ef89d2 | 2008-07-31 00:07:30 -0700 | [diff] [blame] | 2141 | return 0; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2142 | |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 2143 | if (!size_to_hstate(default_hstate_size)) { |
| 2144 | default_hstate_size = HPAGE_SIZE; |
| 2145 | if (!size_to_hstate(default_hstate_size)) |
| 2146 | hugetlb_add_hstate(HUGETLB_PAGE_ORDER); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2147 | } |
Aneesh Kumar K.V | 972dc4d | 2012-07-31 16:42:00 -0700 | [diff] [blame] | 2148 | default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size)); |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 2149 | if (default_hstate_max_huge_pages) |
| 2150 | default_hstate.max_huge_pages = default_hstate_max_huge_pages; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2151 | |
| 2152 | hugetlb_init_hstates(); |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 2153 | gather_bootmem_prealloc(); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2154 | report_hugepages(); |
| 2155 | |
| 2156 | hugetlb_sysfs_init(); |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2157 | hugetlb_register_all_nodes(); |
Jianguo Wu | 7179e7b | 2012-12-18 14:23:19 -0800 | [diff] [blame] | 2158 | hugetlb_cgroup_file_init(); |
Lee Schermerhorn | 9a30523 | 2009-12-14 17:58:25 -0800 | [diff] [blame] | 2159 | |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 2160 | #ifdef CONFIG_SMP |
| 2161 | num_fault_mutexes = roundup_pow_of_two(8 * num_possible_cpus()); |
| 2162 | #else |
| 2163 | num_fault_mutexes = 1; |
| 2164 | #endif |
| 2165 | htlb_fault_mutex_table = |
| 2166 | kmalloc(sizeof(struct mutex) * num_fault_mutexes, GFP_KERNEL); |
| 2167 | BUG_ON(!htlb_fault_mutex_table); |
| 2168 | |
| 2169 | for (i = 0; i < num_fault_mutexes; i++) |
| 2170 | mutex_init(&htlb_fault_mutex_table[i]); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2171 | return 0; |
| 2172 | } |
| 2173 | module_init(hugetlb_init); |
| 2174 | |
| 2175 | /* Should be called on processing a hugepagesz=... option */ |
| 2176 | void __init hugetlb_add_hstate(unsigned order) |
| 2177 | { |
| 2178 | struct hstate *h; |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 2179 | unsigned long i; |
| 2180 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2181 | if (size_to_hstate(PAGE_SIZE << order)) { |
Andrew Morton | ffb22af | 2013-02-22 16:32:08 -0800 | [diff] [blame] | 2182 | pr_warning("hugepagesz= specified twice, ignoring\n"); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2183 | return; |
| 2184 | } |
Aneesh Kumar K.V | 47d3834 | 2012-07-31 16:41:54 -0700 | [diff] [blame] | 2185 | BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2186 | BUG_ON(order == 0); |
Aneesh Kumar K.V | 47d3834 | 2012-07-31 16:41:54 -0700 | [diff] [blame] | 2187 | h = &hstates[hugetlb_max_hstate++]; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2188 | h->order = order; |
| 2189 | h->mask = ~((1ULL << (order + PAGE_SHIFT)) - 1); |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 2190 | h->nr_huge_pages = 0; |
| 2191 | h->free_huge_pages = 0; |
| 2192 | for (i = 0; i < MAX_NUMNODES; ++i) |
| 2193 | INIT_LIST_HEAD(&h->hugepage_freelists[i]); |
Aneesh Kumar K.V | 0edaecf | 2012-07-31 16:42:07 -0700 | [diff] [blame] | 2194 | INIT_LIST_HEAD(&h->hugepage_activelist); |
Lai Jiangshan | 8cebfcd | 2012-12-12 13:51:36 -0800 | [diff] [blame] | 2195 | h->next_nid_to_alloc = first_node(node_states[N_MEMORY]); |
| 2196 | h->next_nid_to_free = first_node(node_states[N_MEMORY]); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2197 | snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB", |
| 2198 | huge_page_size(h)/1024); |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 2199 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2200 | parsed_hstate = h; |
| 2201 | } |
| 2202 | |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 2203 | static int __init hugetlb_nrpages_setup(char *s) |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2204 | { |
| 2205 | unsigned long *mhp; |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 2206 | static unsigned long *last_mhp; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2207 | |
| 2208 | /* |
Aneesh Kumar K.V | 47d3834 | 2012-07-31 16:41:54 -0700 | [diff] [blame] | 2209 | * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter yet, |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2210 | * so this hugepages= parameter goes to the "default hstate". |
| 2211 | */ |
Aneesh Kumar K.V | 47d3834 | 2012-07-31 16:41:54 -0700 | [diff] [blame] | 2212 | if (!hugetlb_max_hstate) |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2213 | mhp = &default_hstate_max_huge_pages; |
| 2214 | else |
| 2215 | mhp = &parsed_hstate->max_huge_pages; |
| 2216 | |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 2217 | if (mhp == last_mhp) { |
Andrew Morton | ffb22af | 2013-02-22 16:32:08 -0800 | [diff] [blame] | 2218 | pr_warning("hugepages= specified twice without " |
| 2219 | "interleaving hugepagesz=, ignoring\n"); |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 2220 | return 1; |
| 2221 | } |
| 2222 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2223 | if (sscanf(s, "%lu", mhp) <= 0) |
| 2224 | *mhp = 0; |
| 2225 | |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 2226 | /* |
| 2227 | * Global state is always initialized later in hugetlb_init. |
| 2228 | * But we need to allocate >= MAX_ORDER hstates here early to still |
| 2229 | * use the bootmem allocator. |
| 2230 | */ |
Aneesh Kumar K.V | 47d3834 | 2012-07-31 16:41:54 -0700 | [diff] [blame] | 2231 | if (hugetlb_max_hstate && parsed_hstate->order >= MAX_ORDER) |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 2232 | hugetlb_hstate_alloc_pages(parsed_hstate); |
| 2233 | |
| 2234 | last_mhp = mhp; |
| 2235 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2236 | return 1; |
| 2237 | } |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 2238 | __setup("hugepages=", hugetlb_nrpages_setup); |
| 2239 | |
| 2240 | static int __init hugetlb_default_setup(char *s) |
| 2241 | { |
| 2242 | default_hstate_size = memparse(s, &s); |
| 2243 | return 1; |
| 2244 | } |
| 2245 | __setup("default_hugepagesz=", hugetlb_default_setup); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 2246 | |
Nishanth Aravamudan | 8a21346 | 2008-07-25 19:44:37 -0700 | [diff] [blame] | 2247 | static unsigned int cpuset_mems_nr(unsigned int *array) |
| 2248 | { |
| 2249 | int node; |
| 2250 | unsigned int nr = 0; |
| 2251 | |
| 2252 | for_each_node_mask(node, cpuset_current_mems_allowed) |
| 2253 | nr += array[node]; |
| 2254 | |
| 2255 | return nr; |
| 2256 | } |
| 2257 | |
| 2258 | #ifdef CONFIG_SYSCTL |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 2259 | static int hugetlb_sysctl_handler_common(bool obey_mempolicy, |
| 2260 | struct ctl_table *table, int write, |
| 2261 | void __user *buffer, size_t *length, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2262 | { |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2263 | struct hstate *h = &default_hstate; |
David Rientjes | 238d3c1 | 2014-08-06 16:06:51 -0700 | [diff] [blame] | 2264 | unsigned long tmp = h->max_huge_pages; |
Michal Hocko | 08d4a24 | 2011-01-13 15:47:26 -0800 | [diff] [blame] | 2265 | int ret; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2266 | |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 2267 | if (!hugepages_supported()) |
| 2268 | return -ENOTSUPP; |
| 2269 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2270 | table->data = &tmp; |
| 2271 | table->maxlen = sizeof(unsigned long); |
Michal Hocko | 08d4a24 | 2011-01-13 15:47:26 -0800 | [diff] [blame] | 2272 | ret = proc_doulongvec_minmax(table, write, buffer, length, ppos); |
| 2273 | if (ret) |
| 2274 | goto out; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2275 | |
David Rientjes | 238d3c1 | 2014-08-06 16:06:51 -0700 | [diff] [blame] | 2276 | if (write) |
| 2277 | ret = __nr_hugepages_store_common(obey_mempolicy, h, |
| 2278 | NUMA_NO_NODE, tmp, *length); |
Michal Hocko | 08d4a24 | 2011-01-13 15:47:26 -0800 | [diff] [blame] | 2279 | out: |
| 2280 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2281 | } |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 2282 | |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 2283 | int hugetlb_sysctl_handler(struct ctl_table *table, int write, |
| 2284 | void __user *buffer, size_t *length, loff_t *ppos) |
| 2285 | { |
| 2286 | |
| 2287 | return hugetlb_sysctl_handler_common(false, table, write, |
| 2288 | buffer, length, ppos); |
| 2289 | } |
| 2290 | |
| 2291 | #ifdef CONFIG_NUMA |
| 2292 | int hugetlb_mempolicy_sysctl_handler(struct ctl_table *table, int write, |
| 2293 | void __user *buffer, size_t *length, loff_t *ppos) |
| 2294 | { |
| 2295 | return hugetlb_sysctl_handler_common(true, table, write, |
| 2296 | buffer, length, ppos); |
| 2297 | } |
| 2298 | #endif /* CONFIG_NUMA */ |
| 2299 | |
Nishanth Aravamudan | a3d0c6a | 2008-02-08 04:18:18 -0800 | [diff] [blame] | 2300 | int hugetlb_overcommit_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2301 | void __user *buffer, |
Nishanth Aravamudan | a3d0c6a | 2008-02-08 04:18:18 -0800 | [diff] [blame] | 2302 | size_t *length, loff_t *ppos) |
| 2303 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2304 | struct hstate *h = &default_hstate; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2305 | unsigned long tmp; |
Michal Hocko | 08d4a24 | 2011-01-13 15:47:26 -0800 | [diff] [blame] | 2306 | int ret; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2307 | |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 2308 | if (!hugepages_supported()) |
| 2309 | return -ENOTSUPP; |
| 2310 | |
Petr Holasek | c033a93 | 2011-03-22 16:33:05 -0700 | [diff] [blame] | 2311 | tmp = h->nr_overcommit_huge_pages; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2312 | |
Luiz Capitulino | bae7f4a | 2014-06-04 16:07:08 -0700 | [diff] [blame] | 2313 | if (write && hstate_is_gigantic(h)) |
Eric B Munson | adbe872 | 2011-01-13 15:47:27 -0800 | [diff] [blame] | 2314 | return -EINVAL; |
| 2315 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2316 | table->data = &tmp; |
| 2317 | table->maxlen = sizeof(unsigned long); |
Michal Hocko | 08d4a24 | 2011-01-13 15:47:26 -0800 | [diff] [blame] | 2318 | ret = proc_doulongvec_minmax(table, write, buffer, length, ppos); |
| 2319 | if (ret) |
| 2320 | goto out; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 2321 | |
| 2322 | if (write) { |
| 2323 | spin_lock(&hugetlb_lock); |
| 2324 | h->nr_overcommit_huge_pages = tmp; |
| 2325 | spin_unlock(&hugetlb_lock); |
| 2326 | } |
Michal Hocko | 08d4a24 | 2011-01-13 15:47:26 -0800 | [diff] [blame] | 2327 | out: |
| 2328 | return ret; |
Nishanth Aravamudan | a3d0c6a | 2008-02-08 04:18:18 -0800 | [diff] [blame] | 2329 | } |
| 2330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | #endif /* CONFIG_SYSCTL */ |
| 2332 | |
Alexey Dobriyan | e1759c2 | 2008-10-15 23:50:22 +0400 | [diff] [blame] | 2333 | void hugetlb_report_meminfo(struct seq_file *m) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2334 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2335 | struct hstate *h = &default_hstate; |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 2336 | if (!hugepages_supported()) |
| 2337 | return; |
Alexey Dobriyan | e1759c2 | 2008-10-15 23:50:22 +0400 | [diff] [blame] | 2338 | seq_printf(m, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 2339 | "HugePages_Total: %5lu\n" |
| 2340 | "HugePages_Free: %5lu\n" |
| 2341 | "HugePages_Rsvd: %5lu\n" |
| 2342 | "HugePages_Surp: %5lu\n" |
| 2343 | "Hugepagesize: %8lu kB\n", |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2344 | h->nr_huge_pages, |
| 2345 | h->free_huge_pages, |
| 2346 | h->resv_huge_pages, |
| 2347 | h->surplus_huge_pages, |
| 2348 | 1UL << (huge_page_order(h) + PAGE_SHIFT - 10)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | } |
| 2350 | |
| 2351 | int hugetlb_report_node_meminfo(int nid, char *buf) |
| 2352 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2353 | struct hstate *h = &default_hstate; |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 2354 | if (!hugepages_supported()) |
| 2355 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | return sprintf(buf, |
| 2357 | "Node %d HugePages_Total: %5u\n" |
Nishanth Aravamudan | a1de091 | 2008-03-26 14:37:53 -0700 | [diff] [blame] | 2358 | "Node %d HugePages_Free: %5u\n" |
| 2359 | "Node %d HugePages_Surp: %5u\n", |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2360 | nid, h->nr_huge_pages_node[nid], |
| 2361 | nid, h->free_huge_pages_node[nid], |
| 2362 | nid, h->surplus_huge_pages_node[nid]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2363 | } |
| 2364 | |
David Rientjes | 949f7ec | 2013-04-29 15:07:48 -0700 | [diff] [blame] | 2365 | void hugetlb_show_meminfo(void) |
| 2366 | { |
| 2367 | struct hstate *h; |
| 2368 | int nid; |
| 2369 | |
Nishanth Aravamudan | 457c1b2 | 2014-05-06 12:50:00 -0700 | [diff] [blame] | 2370 | if (!hugepages_supported()) |
| 2371 | return; |
| 2372 | |
David Rientjes | 949f7ec | 2013-04-29 15:07:48 -0700 | [diff] [blame] | 2373 | for_each_node_state(nid, N_MEMORY) |
| 2374 | for_each_hstate(h) |
| 2375 | pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n", |
| 2376 | nid, |
| 2377 | h->nr_huge_pages_node[nid], |
| 2378 | h->free_huge_pages_node[nid], |
| 2379 | h->surplus_huge_pages_node[nid], |
| 2380 | 1UL << (huge_page_order(h) + PAGE_SHIFT - 10)); |
| 2381 | } |
| 2382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ |
| 2384 | unsigned long hugetlb_total_pages(void) |
| 2385 | { |
Wanpeng Li | d002858 | 2013-03-22 15:04:40 -0700 | [diff] [blame] | 2386 | struct hstate *h; |
| 2387 | unsigned long nr_total_pages = 0; |
| 2388 | |
| 2389 | for_each_hstate(h) |
| 2390 | nr_total_pages += h->nr_huge_pages * pages_per_huge_page(h); |
| 2391 | return nr_total_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2394 | static int hugetlb_acct_memory(struct hstate *h, long delta) |
Mel Gorman | fc1b8a7 | 2008-07-23 21:27:22 -0700 | [diff] [blame] | 2395 | { |
| 2396 | int ret = -ENOMEM; |
| 2397 | |
| 2398 | spin_lock(&hugetlb_lock); |
| 2399 | /* |
| 2400 | * When cpuset is configured, it breaks the strict hugetlb page |
| 2401 | * reservation as the accounting is done on a global variable. Such |
| 2402 | * reservation is completely rubbish in the presence of cpuset because |
| 2403 | * the reservation is not checked against page availability for the |
| 2404 | * current cpuset. Application can still potentially OOM'ed by kernel |
| 2405 | * with lack of free htlb page in cpuset that the task is in. |
| 2406 | * Attempt to enforce strict accounting with cpuset is almost |
| 2407 | * impossible (or too ugly) because cpuset is too fluid that |
| 2408 | * task or memory node can be dynamically moved between cpusets. |
| 2409 | * |
| 2410 | * The change of semantics for shared hugetlb mapping with cpuset is |
| 2411 | * undesirable. However, in order to preserve some of the semantics, |
| 2412 | * we fall back to check against current free page availability as |
| 2413 | * a best attempt and hopefully to minimize the impact of changing |
| 2414 | * semantics that cpuset has. |
| 2415 | */ |
| 2416 | if (delta > 0) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2417 | if (gather_surplus_pages(h, delta) < 0) |
Mel Gorman | fc1b8a7 | 2008-07-23 21:27:22 -0700 | [diff] [blame] | 2418 | goto out; |
| 2419 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2420 | if (delta > cpuset_mems_nr(h->free_huge_pages_node)) { |
| 2421 | return_unused_surplus_pages(h, delta); |
Mel Gorman | fc1b8a7 | 2008-07-23 21:27:22 -0700 | [diff] [blame] | 2422 | goto out; |
| 2423 | } |
| 2424 | } |
| 2425 | |
| 2426 | ret = 0; |
| 2427 | if (delta < 0) |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2428 | return_unused_surplus_pages(h, (unsigned long) -delta); |
Mel Gorman | fc1b8a7 | 2008-07-23 21:27:22 -0700 | [diff] [blame] | 2429 | |
| 2430 | out: |
| 2431 | spin_unlock(&hugetlb_lock); |
| 2432 | return ret; |
| 2433 | } |
| 2434 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2435 | static void hugetlb_vm_op_open(struct vm_area_struct *vma) |
| 2436 | { |
Joonsoo Kim | f522c3a | 2013-09-11 14:21:53 -0700 | [diff] [blame] | 2437 | struct resv_map *resv = vma_resv_map(vma); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2438 | |
| 2439 | /* |
| 2440 | * This new VMA should share its siblings reservation map if present. |
| 2441 | * The VMA will only ever have a valid reservation map pointer where |
| 2442 | * it is being copied for another still existing VMA. As that VMA |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2443 | * has a reference to the reservation map it cannot disappear until |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2444 | * after this open call completes. It is therefore safe to take a |
| 2445 | * new reference here without additional locking. |
| 2446 | */ |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 2447 | if (resv && is_vma_resv_set(vma, HPAGE_RESV_OWNER)) |
Joonsoo Kim | f522c3a | 2013-09-11 14:21:53 -0700 | [diff] [blame] | 2448 | kref_get(&resv->refs); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2449 | } |
| 2450 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 2451 | static void hugetlb_vm_op_close(struct vm_area_struct *vma) |
| 2452 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2453 | struct hstate *h = hstate_vma(vma); |
Joonsoo Kim | f522c3a | 2013-09-11 14:21:53 -0700 | [diff] [blame] | 2454 | struct resv_map *resv = vma_resv_map(vma); |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 2455 | struct hugepage_subpool *spool = subpool_vma(vma); |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 2456 | unsigned long reserve, start, end; |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2457 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 2458 | if (!resv || !is_vma_resv_set(vma, HPAGE_RESV_OWNER)) |
| 2459 | return; |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2460 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 2461 | start = vma_hugecache_offset(h, vma, vma->vm_start); |
| 2462 | end = vma_hugecache_offset(h, vma, vma->vm_end); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2463 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 2464 | reserve = (end - start) - region_count(resv, start, end); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2465 | |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 2466 | kref_put(&resv->refs, resv_map_release); |
| 2467 | |
| 2468 | if (reserve) { |
| 2469 | hugetlb_acct_memory(h, -reserve); |
| 2470 | hugepage_subpool_put_pages(spool, reserve); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2471 | } |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 2472 | } |
| 2473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2474 | /* |
| 2475 | * We cannot handle pagefaults against hugetlb pages at all. They cause |
| 2476 | * handle_mm_fault() to try to instantiate regular-sized pages in the |
| 2477 | * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get |
| 2478 | * this far. |
| 2479 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 2480 | static int hugetlb_vm_op_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2481 | { |
| 2482 | BUG(); |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 2483 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | } |
| 2485 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 2486 | const struct vm_operations_struct hugetlb_vm_ops = { |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 2487 | .fault = hugetlb_vm_op_fault, |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 2488 | .open = hugetlb_vm_op_open, |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 2489 | .close = hugetlb_vm_op_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | }; |
| 2491 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2492 | static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, |
| 2493 | int writable) |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2494 | { |
| 2495 | pte_t entry; |
| 2496 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2497 | if (writable) { |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 2498 | entry = huge_pte_mkwrite(huge_pte_mkdirty(mk_huge_pte(page, |
| 2499 | vma->vm_page_prot))); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2500 | } else { |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 2501 | entry = huge_pte_wrprotect(mk_huge_pte(page, |
| 2502 | vma->vm_page_prot)); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2503 | } |
| 2504 | entry = pte_mkyoung(entry); |
| 2505 | entry = pte_mkhuge(entry); |
Chris Metcalf | d9ed9fa | 2012-04-01 14:01:34 -0400 | [diff] [blame] | 2506 | entry = arch_make_huge_pte(entry, vma, page, writable); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2507 | |
| 2508 | return entry; |
| 2509 | } |
| 2510 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2511 | static void set_huge_ptep_writable(struct vm_area_struct *vma, |
| 2512 | unsigned long address, pte_t *ptep) |
| 2513 | { |
| 2514 | pte_t entry; |
| 2515 | |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 2516 | entry = huge_pte_mkwrite(huge_pte_mkdirty(huge_ptep_get(ptep))); |
Chris Forbes | 32f8452 | 2011-07-25 17:12:14 -0700 | [diff] [blame] | 2517 | if (huge_ptep_set_access_flags(vma, address, ptep, entry, 1)) |
Russell King | 4b3073e | 2009-12-18 16:40:18 +0000 | [diff] [blame] | 2518 | update_mmu_cache(vma, address, ptep); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2519 | } |
| 2520 | |
Naoya Horiguchi | 4a705fe | 2014-06-23 13:22:03 -0700 | [diff] [blame] | 2521 | static int is_hugetlb_entry_migration(pte_t pte) |
| 2522 | { |
| 2523 | swp_entry_t swp; |
| 2524 | |
| 2525 | if (huge_pte_none(pte) || pte_present(pte)) |
| 2526 | return 0; |
| 2527 | swp = pte_to_swp_entry(pte); |
| 2528 | if (non_swap_entry(swp) && is_migration_entry(swp)) |
| 2529 | return 1; |
| 2530 | else |
| 2531 | return 0; |
| 2532 | } |
| 2533 | |
| 2534 | static int is_hugetlb_entry_hwpoisoned(pte_t pte) |
| 2535 | { |
| 2536 | swp_entry_t swp; |
| 2537 | |
| 2538 | if (huge_pte_none(pte) || pte_present(pte)) |
| 2539 | return 0; |
| 2540 | swp = pte_to_swp_entry(pte); |
| 2541 | if (non_swap_entry(swp) && is_hwpoison_entry(swp)) |
| 2542 | return 1; |
| 2543 | else |
| 2544 | return 0; |
| 2545 | } |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2546 | |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2547 | int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, |
| 2548 | struct vm_area_struct *vma) |
| 2549 | { |
| 2550 | pte_t *src_pte, *dst_pte, entry; |
| 2551 | struct page *ptepage; |
Hugh Dickins | 1c59827 | 2005-10-19 21:23:43 -0700 | [diff] [blame] | 2552 | unsigned long addr; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2553 | int cow; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2554 | struct hstate *h = hstate_vma(vma); |
| 2555 | unsigned long sz = huge_page_size(h); |
Andreas Sandberg | e8569dd | 2014-01-21 15:49:09 -0800 | [diff] [blame] | 2556 | unsigned long mmun_start; /* For mmu_notifiers */ |
| 2557 | unsigned long mmun_end; /* For mmu_notifiers */ |
| 2558 | int ret = 0; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2559 | |
| 2560 | cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2561 | |
Andreas Sandberg | e8569dd | 2014-01-21 15:49:09 -0800 | [diff] [blame] | 2562 | mmun_start = vma->vm_start; |
| 2563 | mmun_end = vma->vm_end; |
| 2564 | if (cow) |
| 2565 | mmu_notifier_invalidate_range_start(src, mmun_start, mmun_end); |
| 2566 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2567 | for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) { |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2568 | spinlock_t *src_ptl, *dst_ptl; |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 2569 | src_pte = huge_pte_offset(src, addr); |
| 2570 | if (!src_pte) |
| 2571 | continue; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2572 | dst_pte = huge_pte_alloc(dst, addr, sz); |
Andreas Sandberg | e8569dd | 2014-01-21 15:49:09 -0800 | [diff] [blame] | 2573 | if (!dst_pte) { |
| 2574 | ret = -ENOMEM; |
| 2575 | break; |
| 2576 | } |
Larry Woodman | c5c9942 | 2008-01-24 05:49:25 -0800 | [diff] [blame] | 2577 | |
| 2578 | /* If the pagetables are shared don't copy or take references */ |
| 2579 | if (dst_pte == src_pte) |
| 2580 | continue; |
| 2581 | |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2582 | dst_ptl = huge_pte_lock(h, dst, dst_pte); |
| 2583 | src_ptl = huge_pte_lockptr(h, src, src_pte); |
| 2584 | spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING); |
Naoya Horiguchi | 4a705fe | 2014-06-23 13:22:03 -0700 | [diff] [blame] | 2585 | entry = huge_ptep_get(src_pte); |
| 2586 | if (huge_pte_none(entry)) { /* skip none entry */ |
| 2587 | ; |
| 2588 | } else if (unlikely(is_hugetlb_entry_migration(entry) || |
| 2589 | is_hugetlb_entry_hwpoisoned(entry))) { |
| 2590 | swp_entry_t swp_entry = pte_to_swp_entry(entry); |
| 2591 | |
| 2592 | if (is_write_migration_entry(swp_entry) && cow) { |
| 2593 | /* |
| 2594 | * COW mappings require pages in both |
| 2595 | * parent and child to be set to read. |
| 2596 | */ |
| 2597 | make_migration_entry_read(&swp_entry); |
| 2598 | entry = swp_entry_to_pte(swp_entry); |
| 2599 | set_huge_pte_at(src, addr, src_pte, entry); |
| 2600 | } |
| 2601 | set_huge_pte_at(dst, addr, dst_pte, entry); |
| 2602 | } else { |
Joerg Roedel | 34ee645 | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 2603 | if (cow) { |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 2604 | huge_ptep_set_wrprotect(src, addr, src_pte); |
Joerg Roedel | 34ee645 | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 2605 | mmu_notifier_invalidate_range(src, mmun_start, |
| 2606 | mmun_end); |
| 2607 | } |
Naoya Horiguchi | 0253d63 | 2014-07-23 14:00:19 -0700 | [diff] [blame] | 2608 | entry = huge_ptep_get(src_pte); |
Hugh Dickins | 1c59827 | 2005-10-19 21:23:43 -0700 | [diff] [blame] | 2609 | ptepage = pte_page(entry); |
| 2610 | get_page(ptepage); |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 2611 | page_dup_rmap(ptepage); |
Hugh Dickins | 1c59827 | 2005-10-19 21:23:43 -0700 | [diff] [blame] | 2612 | set_huge_pte_at(dst, addr, dst_pte, entry); |
| 2613 | } |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2614 | spin_unlock(src_ptl); |
| 2615 | spin_unlock(dst_ptl); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2616 | } |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2617 | |
Andreas Sandberg | e8569dd | 2014-01-21 15:49:09 -0800 | [diff] [blame] | 2618 | if (cow) |
| 2619 | mmu_notifier_invalidate_range_end(src, mmun_start, mmun_end); |
| 2620 | |
| 2621 | return ret; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2622 | } |
| 2623 | |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2624 | void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, |
| 2625 | unsigned long start, unsigned long end, |
| 2626 | struct page *ref_page) |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2627 | { |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2628 | int force_flush = 0; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2629 | struct mm_struct *mm = vma->vm_mm; |
| 2630 | unsigned long address; |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 2631 | pte_t *ptep; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2632 | pte_t pte; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2633 | spinlock_t *ptl; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2634 | struct page *page; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2635 | struct hstate *h = hstate_vma(vma); |
| 2636 | unsigned long sz = huge_page_size(h); |
Sagi Grimberg | 2ec74c3 | 2012-10-08 16:33:33 -0700 | [diff] [blame] | 2637 | const unsigned long mmun_start = start; /* For mmu_notifiers */ |
| 2638 | const unsigned long mmun_end = end; /* For mmu_notifiers */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2639 | |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2640 | WARN_ON(!is_vm_hugetlb_page(vma)); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2641 | BUG_ON(start & ~huge_page_mask(h)); |
| 2642 | BUG_ON(end & ~huge_page_mask(h)); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2643 | |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2644 | tlb_start_vma(tlb, vma); |
Sagi Grimberg | 2ec74c3 | 2012-10-08 16:33:33 -0700 | [diff] [blame] | 2645 | mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); |
Hillf Danton | 569f48b | 2014-12-10 15:44:41 -0800 | [diff] [blame] | 2646 | address = start; |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2647 | again: |
Hillf Danton | 569f48b | 2014-12-10 15:44:41 -0800 | [diff] [blame] | 2648 | for (; address < end; address += sz) { |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 2649 | ptep = huge_pte_offset(mm, address); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2650 | if (!ptep) |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 2651 | continue; |
| 2652 | |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2653 | ptl = huge_pte_lock(h, mm, ptep); |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 2654 | if (huge_pmd_unshare(mm, &address, ptep)) |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2655 | goto unlock; |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 2656 | |
Hillf Danton | 6629326 | 2012-03-23 15:01:48 -0700 | [diff] [blame] | 2657 | pte = huge_ptep_get(ptep); |
| 2658 | if (huge_pte_none(pte)) |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2659 | goto unlock; |
Hillf Danton | 6629326 | 2012-03-23 15:01:48 -0700 | [diff] [blame] | 2660 | |
| 2661 | /* |
Naoya Horiguchi | 9fbc1f6 | 2015-02-11 15:25:32 -0800 | [diff] [blame] | 2662 | * Migrating hugepage or HWPoisoned hugepage is already |
| 2663 | * unmapped and its refcount is dropped, so just clear pte here. |
Hillf Danton | 6629326 | 2012-03-23 15:01:48 -0700 | [diff] [blame] | 2664 | */ |
Naoya Horiguchi | 9fbc1f6 | 2015-02-11 15:25:32 -0800 | [diff] [blame] | 2665 | if (unlikely(!pte_present(pte))) { |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 2666 | huge_pte_clear(mm, address, ptep); |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2667 | goto unlock; |
Naoya Horiguchi | 8c4894c | 2012-12-12 13:52:28 -0800 | [diff] [blame] | 2668 | } |
Hillf Danton | 6629326 | 2012-03-23 15:01:48 -0700 | [diff] [blame] | 2669 | |
| 2670 | page = pte_page(pte); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2671 | /* |
| 2672 | * If a reference page is supplied, it is because a specific |
| 2673 | * page is being unmapped, not a range. Ensure the page we |
| 2674 | * are about to unmap is the actual page of interest. |
| 2675 | */ |
| 2676 | if (ref_page) { |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2677 | if (page != ref_page) |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2678 | goto unlock; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2679 | |
| 2680 | /* |
| 2681 | * Mark the VMA as having unmapped its page so that |
| 2682 | * future faults in this VMA will fail rather than |
| 2683 | * looking like data was lost |
| 2684 | */ |
| 2685 | set_vma_resv_flags(vma, HPAGE_RESV_UNMAPPED); |
| 2686 | } |
| 2687 | |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 2688 | pte = huge_ptep_get_and_clear(mm, address, ptep); |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2689 | tlb_remove_tlb_entry(tlb, ptep, address); |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 2690 | if (huge_pte_dirty(pte)) |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 2691 | set_page_dirty(page); |
Hillf Danton | 9e81130 | 2012-03-21 16:34:03 -0700 | [diff] [blame] | 2692 | |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2693 | page_remove_rmap(page); |
| 2694 | force_flush = !__tlb_remove_page(tlb, page); |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2695 | if (force_flush) { |
Hillf Danton | 569f48b | 2014-12-10 15:44:41 -0800 | [diff] [blame] | 2696 | address += sz; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2697 | spin_unlock(ptl); |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2698 | break; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2699 | } |
Hillf Danton | 9e81130 | 2012-03-21 16:34:03 -0700 | [diff] [blame] | 2700 | /* Bail out after unmapping reference page if supplied */ |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2701 | if (ref_page) { |
| 2702 | spin_unlock(ptl); |
Hillf Danton | 9e81130 | 2012-03-21 16:34:03 -0700 | [diff] [blame] | 2703 | break; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2704 | } |
| 2705 | unlock: |
| 2706 | spin_unlock(ptl); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2707 | } |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2708 | /* |
| 2709 | * mmu_gather ran out of room to batch pages, we break out of |
| 2710 | * the PTE lock to avoid doing the potential expensive TLB invalidate |
| 2711 | * and page-free while holding it. |
| 2712 | */ |
| 2713 | if (force_flush) { |
| 2714 | force_flush = 0; |
| 2715 | tlb_flush_mmu(tlb); |
| 2716 | if (address < end && !ref_page) |
| 2717 | goto again; |
Chen, Kenneth W | fe1668a | 2006-10-04 02:15:24 -0700 | [diff] [blame] | 2718 | } |
Sagi Grimberg | 2ec74c3 | 2012-10-08 16:33:33 -0700 | [diff] [blame] | 2719 | mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2720 | tlb_end_vma(tlb, vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2721 | } |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2722 | |
Mel Gorman | d833352 | 2012-07-31 16:46:20 -0700 | [diff] [blame] | 2723 | void __unmap_hugepage_range_final(struct mmu_gather *tlb, |
| 2724 | struct vm_area_struct *vma, unsigned long start, |
| 2725 | unsigned long end, struct page *ref_page) |
| 2726 | { |
| 2727 | __unmap_hugepage_range(tlb, vma, start, end, ref_page); |
| 2728 | |
| 2729 | /* |
| 2730 | * Clear this flag so that x86's huge_pmd_share page_table_shareable |
| 2731 | * test will fail on a vma being torn down, and not grab a page table |
| 2732 | * on its way out. We're lucky that the flag has such an appropriate |
| 2733 | * name, and can in fact be safely cleared here. We could clear it |
| 2734 | * before the __unmap_hugepage_range above, but all that's necessary |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 2735 | * is to clear it before releasing the i_mmap_rwsem. This works |
Mel Gorman | d833352 | 2012-07-31 16:46:20 -0700 | [diff] [blame] | 2736 | * because in the context this is called, the VMA is about to be |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 2737 | * destroyed and the i_mmap_rwsem is held. |
Mel Gorman | d833352 | 2012-07-31 16:46:20 -0700 | [diff] [blame] | 2738 | */ |
| 2739 | vma->vm_flags &= ~VM_MAYSHARE; |
| 2740 | } |
| 2741 | |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 2742 | void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2743 | unsigned long end, struct page *ref_page) |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 2744 | { |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2745 | struct mm_struct *mm; |
| 2746 | struct mmu_gather tlb; |
| 2747 | |
| 2748 | mm = vma->vm_mm; |
| 2749 | |
Linus Torvalds | 2b04725 | 2013-08-15 11:42:25 -0700 | [diff] [blame] | 2750 | tlb_gather_mmu(&tlb, mm, start, end); |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2751 | __unmap_hugepage_range(&tlb, vma, start, end, ref_page); |
| 2752 | tlb_finish_mmu(&tlb, start, end); |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 2753 | } |
| 2754 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2755 | /* |
| 2756 | * This is called when the original mapper is failing to COW a MAP_PRIVATE |
| 2757 | * mappping it owns the reserve page for. The intention is to unmap the page |
| 2758 | * from other VMAs and let the children be SIGKILLed if they are faulting the |
| 2759 | * same region. |
| 2760 | */ |
Davidlohr Bueso | 2f4612a | 2014-08-06 16:06:45 -0700 | [diff] [blame] | 2761 | static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, |
| 2762 | struct page *page, unsigned long address) |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2763 | { |
Adam Litke | 7526674 | 2008-11-12 13:24:56 -0800 | [diff] [blame] | 2764 | struct hstate *h = hstate_vma(vma); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2765 | struct vm_area_struct *iter_vma; |
| 2766 | struct address_space *mapping; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2767 | pgoff_t pgoff; |
| 2768 | |
| 2769 | /* |
| 2770 | * vm_pgoff is in PAGE_SIZE units, hence the different calculation |
| 2771 | * from page cache lookup which is in HPAGE_SIZE units. |
| 2772 | */ |
Adam Litke | 7526674 | 2008-11-12 13:24:56 -0800 | [diff] [blame] | 2773 | address = address & huge_page_mask(h); |
Michal Hocko | 36e4f20 | 2012-10-08 16:33:31 -0700 | [diff] [blame] | 2774 | pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + |
| 2775 | vma->vm_pgoff; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2776 | mapping = file_inode(vma->vm_file)->i_mapping; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2777 | |
Mel Gorman | 4eb2b1d | 2009-12-14 17:59:53 -0800 | [diff] [blame] | 2778 | /* |
| 2779 | * Take the mapping lock for the duration of the table walk. As |
| 2780 | * this mapping should be shared between all the VMAs, |
| 2781 | * __unmap_hugepage_range() is called as the lock is already held |
| 2782 | */ |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 2783 | i_mmap_lock_write(mapping); |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 2784 | vma_interval_tree_foreach(iter_vma, &mapping->i_mmap, pgoff, pgoff) { |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2785 | /* Do not unmap the current VMA */ |
| 2786 | if (iter_vma == vma) |
| 2787 | continue; |
| 2788 | |
| 2789 | /* |
| 2790 | * Unmap the page from other VMAs without their own reserves. |
| 2791 | * They get marked to be SIGKILLed if they fault in these |
| 2792 | * areas. This is because a future no-page fault on this VMA |
| 2793 | * could insert a zeroed page instead of the data existing |
| 2794 | * from the time of fork. This would look like data corruption |
| 2795 | */ |
| 2796 | if (!is_vma_resv_set(iter_vma, HPAGE_RESV_OWNER)) |
Aneesh Kumar K.V | 24669e5 | 2012-07-31 16:42:03 -0700 | [diff] [blame] | 2797 | unmap_hugepage_range(iter_vma, address, |
| 2798 | address + huge_page_size(h), page); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2799 | } |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 2800 | i_mmap_unlock_write(mapping); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2801 | } |
| 2802 | |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 2803 | /* |
| 2804 | * Hugetlb_cow() should be called with page lock of the original hugepage held. |
Michal Hocko | ef009b2 | 2012-01-10 15:07:21 -0800 | [diff] [blame] | 2805 | * Called with hugetlb_instantiation_mutex held and pte_page locked so we |
| 2806 | * cannot race with other handlers or page migration. |
| 2807 | * Keep the pte_same checks anyway to make transition from the mutex easier. |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 2808 | */ |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2809 | static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2810 | unsigned long address, pte_t *ptep, pte_t pte, |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2811 | struct page *pagecache_page, spinlock_t *ptl) |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2812 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2813 | struct hstate *h = hstate_vma(vma); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2814 | struct page *old_page, *new_page; |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2815 | int ret = 0, outside_reserve = 0; |
Sagi Grimberg | 2ec74c3 | 2012-10-08 16:33:33 -0700 | [diff] [blame] | 2816 | unsigned long mmun_start; /* For mmu_notifiers */ |
| 2817 | unsigned long mmun_end; /* For mmu_notifiers */ |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2818 | |
| 2819 | old_page = pte_page(pte); |
| 2820 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2821 | retry_avoidcopy: |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2822 | /* If no-one else is actually using this page, avoid the copy |
| 2823 | * and just make the page writable */ |
Joonsoo Kim | 37a2140 | 2013-09-11 14:21:04 -0700 | [diff] [blame] | 2824 | if (page_mapcount(old_page) == 1 && PageAnon(old_page)) { |
| 2825 | page_move_anon_rmap(old_page, vma, address); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2826 | set_huge_ptep_writable(vma, address, ptep); |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 2827 | return 0; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2828 | } |
| 2829 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2830 | /* |
| 2831 | * If the process that created a MAP_PRIVATE mapping is about to |
| 2832 | * perform a COW due to a shared page count, attempt to satisfy |
| 2833 | * the allocation without using the existing reserves. The pagecache |
| 2834 | * page is used to determine if the reserve at this address was |
| 2835 | * consumed or not. If reserves were used, a partial faulted mapping |
| 2836 | * at the time of fork() could consume its reserves on COW instead |
| 2837 | * of the full address range. |
| 2838 | */ |
Joonsoo Kim | 5944d01 | 2013-09-11 14:21:55 -0700 | [diff] [blame] | 2839 | if (is_vma_resv_set(vma, HPAGE_RESV_OWNER) && |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2840 | old_page != pagecache_page) |
| 2841 | outside_reserve = 1; |
| 2842 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2843 | page_cache_get(old_page); |
Larry Woodman | b76c8cf | 2009-12-14 17:59:37 -0800 | [diff] [blame] | 2844 | |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2845 | /* |
| 2846 | * Drop page table lock as buddy allocator may be called. It will |
| 2847 | * be acquired again before returning to the caller, as expected. |
| 2848 | */ |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2849 | spin_unlock(ptl); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2850 | new_page = alloc_huge_page(vma, address, outside_reserve); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2851 | |
Adam Litke | 2fc39ce | 2007-11-14 16:59:39 -0800 | [diff] [blame] | 2852 | if (IS_ERR(new_page)) { |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2853 | /* |
| 2854 | * If a process owning a MAP_PRIVATE mapping fails to COW, |
| 2855 | * it is due to references held by a child and an insufficient |
| 2856 | * huge page pool. To guarantee the original mappers |
| 2857 | * reliability, unmap the page from child processes. The child |
| 2858 | * may get SIGKILLed if it later faults. |
| 2859 | */ |
| 2860 | if (outside_reserve) { |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2861 | page_cache_release(old_page); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2862 | BUG_ON(huge_pte_none(pte)); |
Davidlohr Bueso | 2f4612a | 2014-08-06 16:06:45 -0700 | [diff] [blame] | 2863 | unmap_ref_private(mm, vma, old_page, address); |
| 2864 | BUG_ON(huge_pte_none(pte)); |
| 2865 | spin_lock(ptl); |
| 2866 | ptep = huge_pte_offset(mm, address & huge_page_mask(h)); |
| 2867 | if (likely(ptep && |
| 2868 | pte_same(huge_ptep_get(ptep), pte))) |
| 2869 | goto retry_avoidcopy; |
| 2870 | /* |
| 2871 | * race occurs while re-acquiring page table |
| 2872 | * lock, and our job is done. |
| 2873 | */ |
| 2874 | return 0; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2875 | } |
| 2876 | |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2877 | ret = (PTR_ERR(new_page) == -ENOMEM) ? |
| 2878 | VM_FAULT_OOM : VM_FAULT_SIGBUS; |
| 2879 | goto out_release_old; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2880 | } |
| 2881 | |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 2882 | /* |
| 2883 | * When the original hugepage is shared one, it does not have |
| 2884 | * anon_vma prepared. |
| 2885 | */ |
Dean Nelson | 44e2aa9 | 2010-10-26 14:22:08 -0700 | [diff] [blame] | 2886 | if (unlikely(anon_vma_prepare(vma))) { |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2887 | ret = VM_FAULT_OOM; |
| 2888 | goto out_release_all; |
Dean Nelson | 44e2aa9 | 2010-10-26 14:22:08 -0700 | [diff] [blame] | 2889 | } |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 2890 | |
Andrea Arcangeli | 47ad847 | 2011-01-13 15:46:47 -0800 | [diff] [blame] | 2891 | copy_user_huge_page(new_page, old_page, address, vma, |
| 2892 | pages_per_huge_page(h)); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 2893 | __SetPageUptodate(new_page); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2894 | |
Sagi Grimberg | 2ec74c3 | 2012-10-08 16:33:33 -0700 | [diff] [blame] | 2895 | mmun_start = address & huge_page_mask(h); |
| 2896 | mmun_end = mmun_start + huge_page_size(h); |
| 2897 | mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2898 | |
Larry Woodman | b76c8cf | 2009-12-14 17:59:37 -0800 | [diff] [blame] | 2899 | /* |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2900 | * Retake the page table lock to check for racing updates |
Larry Woodman | b76c8cf | 2009-12-14 17:59:37 -0800 | [diff] [blame] | 2901 | * before the page tables are altered |
| 2902 | */ |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2903 | spin_lock(ptl); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2904 | ptep = huge_pte_offset(mm, address & huge_page_mask(h)); |
Naoya Horiguchi | a9af0c5 | 2014-04-07 15:36:54 -0700 | [diff] [blame] | 2905 | if (likely(ptep && pte_same(huge_ptep_get(ptep), pte))) { |
Joonsoo Kim | 07443a8 | 2013-09-11 14:21:58 -0700 | [diff] [blame] | 2906 | ClearPagePrivate(new_page); |
| 2907 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2908 | /* Break COW */ |
Gerald Schaefer | 8fe627e | 2008-04-28 02:13:28 -0700 | [diff] [blame] | 2909 | huge_ptep_clear_flush(vma, address, ptep); |
Joerg Roedel | 34ee645 | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 2910 | mmu_notifier_invalidate_range(mm, mmun_start, mmun_end); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2911 | set_huge_pte_at(mm, address, ptep, |
| 2912 | make_huge_pte(vma, new_page, 1)); |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 2913 | page_remove_rmap(old_page); |
Naoya Horiguchi | cd67f0d | 2010-09-10 13:23:04 +0900 | [diff] [blame] | 2914 | hugepage_add_new_anon_rmap(new_page, vma, address); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2915 | /* Make the old page be freed below */ |
| 2916 | new_page = old_page; |
| 2917 | } |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2918 | spin_unlock(ptl); |
Sagi Grimberg | 2ec74c3 | 2012-10-08 16:33:33 -0700 | [diff] [blame] | 2919 | mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2920 | out_release_all: |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2921 | page_cache_release(new_page); |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2922 | out_release_old: |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2923 | page_cache_release(old_page); |
Joonsoo Kim | 8312034 | 2013-09-11 14:21:57 -0700 | [diff] [blame] | 2924 | |
Davidlohr Bueso | ad4404a | 2014-08-06 16:06:47 -0700 | [diff] [blame] | 2925 | spin_lock(ptl); /* Caller expects lock to be held */ |
| 2926 | return ret; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2927 | } |
| 2928 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2929 | /* Return the pagecache page at a given address within a VMA */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2930 | static struct page *hugetlbfs_pagecache_page(struct hstate *h, |
| 2931 | struct vm_area_struct *vma, unsigned long address) |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2932 | { |
| 2933 | struct address_space *mapping; |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 2934 | pgoff_t idx; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2935 | |
| 2936 | mapping = vma->vm_file->f_mapping; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2937 | idx = vma_hugecache_offset(h, vma, address); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2938 | |
| 2939 | return find_lock_page(mapping, idx); |
| 2940 | } |
| 2941 | |
Hugh Dickins | 3ae77f4 | 2009-09-21 17:03:33 -0700 | [diff] [blame] | 2942 | /* |
| 2943 | * Return whether there is a pagecache page to back given address within VMA. |
| 2944 | * Caller follow_hugetlb_page() holds page_table_lock so we cannot lock_page. |
| 2945 | */ |
| 2946 | static bool hugetlbfs_pagecache_present(struct hstate *h, |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2947 | struct vm_area_struct *vma, unsigned long address) |
| 2948 | { |
| 2949 | struct address_space *mapping; |
| 2950 | pgoff_t idx; |
| 2951 | struct page *page; |
| 2952 | |
| 2953 | mapping = vma->vm_file->f_mapping; |
| 2954 | idx = vma_hugecache_offset(h, vma, address); |
| 2955 | |
| 2956 | page = find_get_page(mapping, idx); |
| 2957 | if (page) |
| 2958 | put_page(page); |
| 2959 | return page != NULL; |
| 2960 | } |
| 2961 | |
Robert P. J. Day | a1ed3dd | 2007-07-17 04:03:33 -0700 | [diff] [blame] | 2962 | static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 2963 | struct address_space *mapping, pgoff_t idx, |
| 2964 | unsigned long address, pte_t *ptep, unsigned int flags) |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2965 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2966 | struct hstate *h = hstate_vma(vma); |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2967 | int ret = VM_FAULT_SIGBUS; |
Hillf Danton | 409eb8c | 2012-01-20 14:34:13 -0800 | [diff] [blame] | 2968 | int anon_rmap = 0; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2969 | unsigned long size; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2970 | struct page *page; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2971 | pte_t new_pte; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 2972 | spinlock_t *ptl; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2973 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2974 | /* |
| 2975 | * Currently, we are forced to kill the process in the event the |
| 2976 | * original mapper has unmapped pages from the child due to a failed |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2977 | * COW. Warn that such a situation has occurred as it may not be obvious |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2978 | */ |
| 2979 | if (is_vma_resv_set(vma, HPAGE_RESV_UNMAPPED)) { |
Andrew Morton | ffb22af | 2013-02-22 16:32:08 -0800 | [diff] [blame] | 2980 | pr_warning("PID %d killed due to inadequate hugepage pool\n", |
| 2981 | current->pid); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2982 | return ret; |
| 2983 | } |
| 2984 | |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2985 | /* |
| 2986 | * Use page lock to guard against racing truncation |
| 2987 | * before we get page_table_lock. |
| 2988 | */ |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 2989 | retry: |
| 2990 | page = find_lock_page(mapping, idx); |
| 2991 | if (!page) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2992 | size = i_size_read(mapping->host) >> huge_page_shift(h); |
Hugh Dickins | ebed4bf | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 2993 | if (idx >= size) |
| 2994 | goto out; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2995 | page = alloc_huge_page(vma, address, 0); |
Adam Litke | 2fc39ce | 2007-11-14 16:59:39 -0800 | [diff] [blame] | 2996 | if (IS_ERR(page)) { |
Aneesh Kumar K.V | 76dcee7 | 2012-07-31 16:41:57 -0700 | [diff] [blame] | 2997 | ret = PTR_ERR(page); |
| 2998 | if (ret == -ENOMEM) |
| 2999 | ret = VM_FAULT_OOM; |
| 3000 | else |
| 3001 | ret = VM_FAULT_SIGBUS; |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 3002 | goto out; |
| 3003 | } |
Andrea Arcangeli | 47ad847 | 2011-01-13 15:46:47 -0800 | [diff] [blame] | 3004 | clear_huge_page(page, address, pages_per_huge_page(h)); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 3005 | __SetPageUptodate(page); |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 3006 | |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 3007 | if (vma->vm_flags & VM_MAYSHARE) { |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 3008 | int err; |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 3009 | struct inode *inode = mapping->host; |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 3010 | |
| 3011 | err = add_to_page_cache(page, mapping, idx, GFP_KERNEL); |
| 3012 | if (err) { |
| 3013 | put_page(page); |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 3014 | if (err == -EEXIST) |
| 3015 | goto retry; |
| 3016 | goto out; |
| 3017 | } |
Joonsoo Kim | 07443a8 | 2013-09-11 14:21:58 -0700 | [diff] [blame] | 3018 | ClearPagePrivate(page); |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 3019 | |
| 3020 | spin_lock(&inode->i_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3021 | inode->i_blocks += blocks_per_huge_page(h); |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 3022 | spin_unlock(&inode->i_lock); |
Mel Gorman | 23be746 | 2010-04-23 13:17:56 -0400 | [diff] [blame] | 3023 | } else { |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 3024 | lock_page(page); |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 3025 | if (unlikely(anon_vma_prepare(vma))) { |
| 3026 | ret = VM_FAULT_OOM; |
| 3027 | goto backout_unlocked; |
| 3028 | } |
Hillf Danton | 409eb8c | 2012-01-20 14:34:13 -0800 | [diff] [blame] | 3029 | anon_rmap = 1; |
Mel Gorman | 23be746 | 2010-04-23 13:17:56 -0400 | [diff] [blame] | 3030 | } |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 3031 | } else { |
Naoya Horiguchi | 998b438 | 2010-09-08 10:19:32 +0900 | [diff] [blame] | 3032 | /* |
| 3033 | * If memory error occurs between mmap() and fault, some process |
| 3034 | * don't have hwpoisoned swap entry for errored virtual address. |
| 3035 | * So we need to block hugepage fault by PG_hwpoison bit check. |
| 3036 | */ |
| 3037 | if (unlikely(PageHWPoison(page))) { |
Chris Forbes | 32f8452 | 2011-07-25 17:12:14 -0700 | [diff] [blame] | 3038 | ret = VM_FAULT_HWPOISON | |
Aneesh Kumar K.V | 972dc4d | 2012-07-31 16:42:00 -0700 | [diff] [blame] | 3039 | VM_FAULT_SET_HINDEX(hstate_index(h)); |
Naoya Horiguchi | 998b438 | 2010-09-08 10:19:32 +0900 | [diff] [blame] | 3040 | goto backout_unlocked; |
| 3041 | } |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 3042 | } |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 3043 | |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3044 | /* |
| 3045 | * If we are going to COW a private mapping later, we examine the |
| 3046 | * pending reservations for this page now. This will ensure that |
| 3047 | * any allocations necessary to record that reservation occur outside |
| 3048 | * the spinlock. |
| 3049 | */ |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 3050 | if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) |
Andy Whitcroft | 2b26736 | 2008-08-12 15:08:49 -0700 | [diff] [blame] | 3051 | if (vma_needs_reservation(h, vma, address) < 0) { |
| 3052 | ret = VM_FAULT_OOM; |
| 3053 | goto backout_unlocked; |
| 3054 | } |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3055 | |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3056 | ptl = huge_pte_lockptr(h, mm, ptep); |
| 3057 | spin_lock(ptl); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3058 | size = i_size_read(mapping->host) >> huge_page_shift(h); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3059 | if (idx >= size) |
| 3060 | goto backout; |
| 3061 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 3062 | ret = 0; |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 3063 | if (!huge_pte_none(huge_ptep_get(ptep))) |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3064 | goto backout; |
| 3065 | |
Joonsoo Kim | 07443a8 | 2013-09-11 14:21:58 -0700 | [diff] [blame] | 3066 | if (anon_rmap) { |
| 3067 | ClearPagePrivate(page); |
Hillf Danton | 409eb8c | 2012-01-20 14:34:13 -0800 | [diff] [blame] | 3068 | hugepage_add_new_anon_rmap(page, vma, address); |
Choi Gi-yong | ac71490 | 2014-04-07 15:37:36 -0700 | [diff] [blame] | 3069 | } else |
Hillf Danton | 409eb8c | 2012-01-20 14:34:13 -0800 | [diff] [blame] | 3070 | page_dup_rmap(page); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 3071 | new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE) |
| 3072 | && (vma->vm_flags & VM_SHARED))); |
| 3073 | set_huge_pte_at(mm, address, ptep, new_pte); |
| 3074 | |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 3075 | if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) { |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 3076 | /* Optimization, do the COW without a second fault */ |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3077 | ret = hugetlb_cow(mm, vma, address, ptep, new_pte, page, ptl); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 3078 | } |
| 3079 | |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3080 | spin_unlock(ptl); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3081 | unlock_page(page); |
| 3082 | out: |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 3083 | return ret; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3084 | |
| 3085 | backout: |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3086 | spin_unlock(ptl); |
Andy Whitcroft | 2b26736 | 2008-08-12 15:08:49 -0700 | [diff] [blame] | 3087 | backout_unlocked: |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3088 | unlock_page(page); |
| 3089 | put_page(page); |
| 3090 | goto out; |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 3091 | } |
| 3092 | |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 3093 | #ifdef CONFIG_SMP |
| 3094 | static u32 fault_mutex_hash(struct hstate *h, struct mm_struct *mm, |
| 3095 | struct vm_area_struct *vma, |
| 3096 | struct address_space *mapping, |
| 3097 | pgoff_t idx, unsigned long address) |
| 3098 | { |
| 3099 | unsigned long key[2]; |
| 3100 | u32 hash; |
| 3101 | |
| 3102 | if (vma->vm_flags & VM_SHARED) { |
| 3103 | key[0] = (unsigned long) mapping; |
| 3104 | key[1] = idx; |
| 3105 | } else { |
| 3106 | key[0] = (unsigned long) mm; |
| 3107 | key[1] = address >> huge_page_shift(h); |
| 3108 | } |
| 3109 | |
| 3110 | hash = jhash2((u32 *)&key, sizeof(key)/sizeof(u32), 0); |
| 3111 | |
| 3112 | return hash & (num_fault_mutexes - 1); |
| 3113 | } |
| 3114 | #else |
| 3115 | /* |
| 3116 | * For uniprocesor systems we always use a single mutex, so just |
| 3117 | * return 0 and avoid the hashing overhead. |
| 3118 | */ |
| 3119 | static u32 fault_mutex_hash(struct hstate *h, struct mm_struct *mm, |
| 3120 | struct vm_area_struct *vma, |
| 3121 | struct address_space *mapping, |
| 3122 | pgoff_t idx, unsigned long address) |
| 3123 | { |
| 3124 | return 0; |
| 3125 | } |
| 3126 | #endif |
| 3127 | |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 3128 | int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 3129 | unsigned long address, unsigned int flags) |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 3130 | { |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 3131 | pte_t *ptep, entry; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3132 | spinlock_t *ptl; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 3133 | int ret; |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 3134 | u32 hash; |
| 3135 | pgoff_t idx; |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 3136 | struct page *page = NULL; |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3137 | struct page *pagecache_page = NULL; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3138 | struct hstate *h = hstate_vma(vma); |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 3139 | struct address_space *mapping; |
Naoya Horiguchi | 0f792cf | 2015-02-11 15:25:25 -0800 | [diff] [blame] | 3140 | int need_wait_lock = 0; |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 3141 | |
KAMEZAWA Hiroyuki | 1e16a53 | 2012-01-10 15:07:22 -0800 | [diff] [blame] | 3142 | address &= huge_page_mask(h); |
| 3143 | |
Naoya Horiguchi | fd6a03e | 2010-05-28 09:29:21 +0900 | [diff] [blame] | 3144 | ptep = huge_pte_offset(mm, address); |
| 3145 | if (ptep) { |
| 3146 | entry = huge_ptep_get(ptep); |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 3147 | if (unlikely(is_hugetlb_entry_migration(entry))) { |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3148 | migration_entry_wait_huge(vma, mm, ptep); |
Naoya Horiguchi | 290408d | 2010-09-08 10:19:35 +0900 | [diff] [blame] | 3149 | return 0; |
| 3150 | } else if (unlikely(is_hugetlb_entry_hwpoisoned(entry))) |
Chris Forbes | 32f8452 | 2011-07-25 17:12:14 -0700 | [diff] [blame] | 3151 | return VM_FAULT_HWPOISON_LARGE | |
Aneesh Kumar K.V | 972dc4d | 2012-07-31 16:42:00 -0700 | [diff] [blame] | 3152 | VM_FAULT_SET_HINDEX(hstate_index(h)); |
Naoya Horiguchi | fd6a03e | 2010-05-28 09:29:21 +0900 | [diff] [blame] | 3153 | } |
| 3154 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3155 | ptep = huge_pte_alloc(mm, address, huge_page_size(h)); |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 3156 | if (!ptep) |
| 3157 | return VM_FAULT_OOM; |
| 3158 | |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 3159 | mapping = vma->vm_file->f_mapping; |
| 3160 | idx = vma_hugecache_offset(h, vma, address); |
| 3161 | |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 3162 | /* |
| 3163 | * Serialize hugepage allocation and instantiation, so that we don't |
| 3164 | * get spurious allocation failures if two CPUs race to instantiate |
| 3165 | * the same page in the page cache. |
| 3166 | */ |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 3167 | hash = fault_mutex_hash(h, mm, vma, mapping, idx, address); |
| 3168 | mutex_lock(&htlb_fault_mutex_table[hash]); |
| 3169 | |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 3170 | entry = huge_ptep_get(ptep); |
| 3171 | if (huge_pte_none(entry)) { |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 3172 | ret = hugetlb_no_page(mm, vma, mapping, idx, address, ptep, flags); |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 3173 | goto out_mutex; |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 3174 | } |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 3175 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 3176 | ret = 0; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 3177 | |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3178 | /* |
Naoya Horiguchi | 0f792cf | 2015-02-11 15:25:25 -0800 | [diff] [blame] | 3179 | * entry could be a migration/hwpoison entry at this point, so this |
| 3180 | * check prevents the kernel from going below assuming that we have |
| 3181 | * a active hugepage in pagecache. This goto expects the 2nd page fault, |
| 3182 | * and is_hugetlb_entry_(migration|hwpoisoned) check will properly |
| 3183 | * handle it. |
| 3184 | */ |
| 3185 | if (!pte_present(entry)) |
| 3186 | goto out_mutex; |
| 3187 | |
| 3188 | /* |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3189 | * If we are going to COW the mapping later, we examine the pending |
| 3190 | * reservations for this page now. This will ensure that any |
| 3191 | * allocations necessary to record that reservation occur outside the |
| 3192 | * spinlock. For private mappings, we also lookup the pagecache |
| 3193 | * page now as it is used to determine if a reservation has been |
| 3194 | * consumed. |
| 3195 | */ |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 3196 | if ((flags & FAULT_FLAG_WRITE) && !huge_pte_write(entry)) { |
Andy Whitcroft | 2b26736 | 2008-08-12 15:08:49 -0700 | [diff] [blame] | 3197 | if (vma_needs_reservation(h, vma, address) < 0) { |
| 3198 | ret = VM_FAULT_OOM; |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 3199 | goto out_mutex; |
Andy Whitcroft | 2b26736 | 2008-08-12 15:08:49 -0700 | [diff] [blame] | 3200 | } |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3201 | |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 3202 | if (!(vma->vm_flags & VM_MAYSHARE)) |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3203 | pagecache_page = hugetlbfs_pagecache_page(h, |
| 3204 | vma, address); |
| 3205 | } |
| 3206 | |
Naoya Horiguchi | 0f792cf | 2015-02-11 15:25:25 -0800 | [diff] [blame] | 3207 | ptl = huge_pte_lock(h, mm, ptep); |
Naoya Horiguchi | 0fe6e20 | 2010-05-28 09:29:16 +0900 | [diff] [blame] | 3208 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 3209 | /* Check for a racing update before calling hugetlb_cow */ |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 3210 | if (unlikely(!pte_same(entry, huge_ptep_get(ptep)))) |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3211 | goto out_ptl; |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 3212 | |
Naoya Horiguchi | 0f792cf | 2015-02-11 15:25:25 -0800 | [diff] [blame] | 3213 | /* |
| 3214 | * hugetlb_cow() requires page locks of pte_page(entry) and |
| 3215 | * pagecache_page, so here we need take the former one |
| 3216 | * when page != pagecache_page or !pagecache_page. |
| 3217 | */ |
| 3218 | page = pte_page(entry); |
| 3219 | if (page != pagecache_page) |
| 3220 | if (!trylock_page(page)) { |
| 3221 | need_wait_lock = 1; |
| 3222 | goto out_ptl; |
| 3223 | } |
| 3224 | |
| 3225 | get_page(page); |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 3226 | |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 3227 | if (flags & FAULT_FLAG_WRITE) { |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 3228 | if (!huge_pte_write(entry)) { |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3229 | ret = hugetlb_cow(mm, vma, address, ptep, entry, |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3230 | pagecache_page, ptl); |
Naoya Horiguchi | 0f792cf | 2015-02-11 15:25:25 -0800 | [diff] [blame] | 3231 | goto out_put_page; |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 3232 | } |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 3233 | entry = huge_pte_mkdirty(entry); |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 3234 | } |
| 3235 | entry = pte_mkyoung(entry); |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 3236 | if (huge_ptep_set_access_flags(vma, address, ptep, entry, |
| 3237 | flags & FAULT_FLAG_WRITE)) |
Russell King | 4b3073e | 2009-12-18 16:40:18 +0000 | [diff] [blame] | 3238 | update_mmu_cache(vma, address, ptep); |
Naoya Horiguchi | 0f792cf | 2015-02-11 15:25:25 -0800 | [diff] [blame] | 3239 | out_put_page: |
| 3240 | if (page != pagecache_page) |
| 3241 | unlock_page(page); |
| 3242 | put_page(page); |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3243 | out_ptl: |
| 3244 | spin_unlock(ptl); |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 3245 | |
| 3246 | if (pagecache_page) { |
| 3247 | unlock_page(pagecache_page); |
| 3248 | put_page(pagecache_page); |
| 3249 | } |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 3250 | out_mutex: |
Davidlohr Bueso | 8382d91 | 2014-04-03 14:47:31 -0700 | [diff] [blame] | 3251 | mutex_unlock(&htlb_fault_mutex_table[hash]); |
Naoya Horiguchi | 0f792cf | 2015-02-11 15:25:25 -0800 | [diff] [blame] | 3252 | /* |
| 3253 | * Generally it's safe to hold refcount during waiting page lock. But |
| 3254 | * here we just wait to defer the next page fault to avoid busy loop and |
| 3255 | * the page is not used after unlocked before returning from the current |
| 3256 | * page fault. So we are safe from accessing freed page, even if we wait |
| 3257 | * here without taking refcount. |
| 3258 | */ |
| 3259 | if (need_wait_lock) |
| 3260 | wait_on_page_locked(page); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 3261 | return ret; |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 3262 | } |
| 3263 | |
Michel Lespinasse | 28a3571 | 2013-02-22 16:35:55 -0800 | [diff] [blame] | 3264 | long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, |
| 3265 | struct page **pages, struct vm_area_struct **vmas, |
| 3266 | unsigned long *position, unsigned long *nr_pages, |
| 3267 | long i, unsigned int flags) |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3268 | { |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 3269 | unsigned long pfn_offset; |
| 3270 | unsigned long vaddr = *position; |
Michel Lespinasse | 28a3571 | 2013-02-22 16:35:55 -0800 | [diff] [blame] | 3271 | unsigned long remainder = *nr_pages; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3272 | struct hstate *h = hstate_vma(vma); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3273 | |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3274 | while (vaddr < vma->vm_end && remainder) { |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3275 | pte_t *pte; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3276 | spinlock_t *ptl = NULL; |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3277 | int absent; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3278 | struct page *page; |
| 3279 | |
| 3280 | /* |
| 3281 | * Some archs (sparc64, sh*) have multiple pte_ts to |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3282 | * each hugepage. We have to make sure we get the |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3283 | * first, for the page indexing below to work. |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3284 | * |
| 3285 | * Note that page table lock is not held when pte is null. |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3286 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3287 | pte = huge_pte_offset(mm, vaddr & huge_page_mask(h)); |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3288 | if (pte) |
| 3289 | ptl = huge_pte_lock(h, mm, pte); |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3290 | absent = !pte || huge_pte_none(huge_ptep_get(pte)); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3291 | |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3292 | /* |
| 3293 | * When coredumping, it suits get_dump_page if we just return |
Hugh Dickins | 3ae77f4 | 2009-09-21 17:03:33 -0700 | [diff] [blame] | 3294 | * an error where there's an empty slot with no huge pagecache |
| 3295 | * to back it. This way, we avoid allocating a hugepage, and |
| 3296 | * the sparse dumpfile avoids allocating disk blocks, but its |
| 3297 | * huge holes still show up with zeroes where they need to be. |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3298 | */ |
Hugh Dickins | 3ae77f4 | 2009-09-21 17:03:33 -0700 | [diff] [blame] | 3299 | if (absent && (flags & FOLL_DUMP) && |
| 3300 | !hugetlbfs_pagecache_present(h, vma, vaddr)) { |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3301 | if (pte) |
| 3302 | spin_unlock(ptl); |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3303 | remainder = 0; |
| 3304 | break; |
| 3305 | } |
| 3306 | |
Naoya Horiguchi | 9cc3a5b | 2013-04-17 15:58:30 -0700 | [diff] [blame] | 3307 | /* |
| 3308 | * We need call hugetlb_fault for both hugepages under migration |
| 3309 | * (in which case hugetlb_fault waits for the migration,) and |
| 3310 | * hwpoisoned hugepages (in which case we need to prevent the |
| 3311 | * caller from accessing to them.) In order to do this, we use |
| 3312 | * here is_swap_pte instead of is_hugetlb_entry_migration and |
| 3313 | * is_hugetlb_entry_hwpoisoned. This is because it simply covers |
| 3314 | * both cases, and because we can't follow correct pages |
| 3315 | * directly from any kind of swap entries. |
| 3316 | */ |
| 3317 | if (absent || is_swap_pte(huge_ptep_get(pte)) || |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 3318 | ((flags & FOLL_WRITE) && |
| 3319 | !huge_pte_write(huge_ptep_get(pte)))) { |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3320 | int ret; |
| 3321 | |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3322 | if (pte) |
| 3323 | spin_unlock(ptl); |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3324 | ret = hugetlb_fault(mm, vma, vaddr, |
| 3325 | (flags & FOLL_WRITE) ? FAULT_FLAG_WRITE : 0); |
Adam Litke | a89182c | 2007-08-22 14:01:51 -0700 | [diff] [blame] | 3326 | if (!(ret & VM_FAULT_ERROR)) |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3327 | continue; |
| 3328 | |
| 3329 | remainder = 0; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 3330 | break; |
| 3331 | } |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3332 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3333 | pfn_offset = (vaddr & ~huge_page_mask(h)) >> PAGE_SHIFT; |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 3334 | page = pte_page(huge_ptep_get(pte)); |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 3335 | same_page: |
Chen, Kenneth W | d669218 | 2006-03-31 02:29:57 -0800 | [diff] [blame] | 3336 | if (pages) { |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3337 | pages[i] = mem_map_offset(page, pfn_offset); |
Andrea Arcangeli | a0368d4 | 2014-01-21 15:48:49 -0800 | [diff] [blame] | 3338 | get_page_foll(pages[i]); |
Chen, Kenneth W | d669218 | 2006-03-31 02:29:57 -0800 | [diff] [blame] | 3339 | } |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3340 | |
| 3341 | if (vmas) |
| 3342 | vmas[i] = vma; |
| 3343 | |
| 3344 | vaddr += PAGE_SIZE; |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 3345 | ++pfn_offset; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3346 | --remainder; |
| 3347 | ++i; |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 3348 | if (vaddr < vma->vm_end && remainder && |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3349 | pfn_offset < pages_per_huge_page(h)) { |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 3350 | /* |
| 3351 | * We use pfn_offset to avoid touching the pageframes |
| 3352 | * of this compound page. |
| 3353 | */ |
| 3354 | goto same_page; |
| 3355 | } |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3356 | spin_unlock(ptl); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3357 | } |
Michel Lespinasse | 28a3571 | 2013-02-22 16:35:55 -0800 | [diff] [blame] | 3358 | *nr_pages = remainder; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3359 | *position = vaddr; |
| 3360 | |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 3361 | return i ? i : -EFAULT; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 3362 | } |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3363 | |
Peter Zijlstra | 7da4d64 | 2012-11-19 03:14:23 +0100 | [diff] [blame] | 3364 | unsigned long hugetlb_change_protection(struct vm_area_struct *vma, |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3365 | unsigned long address, unsigned long end, pgprot_t newprot) |
| 3366 | { |
| 3367 | struct mm_struct *mm = vma->vm_mm; |
| 3368 | unsigned long start = address; |
| 3369 | pte_t *ptep; |
| 3370 | pte_t pte; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3371 | struct hstate *h = hstate_vma(vma); |
Peter Zijlstra | 7da4d64 | 2012-11-19 03:14:23 +0100 | [diff] [blame] | 3372 | unsigned long pages = 0; |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3373 | |
| 3374 | BUG_ON(address >= end); |
| 3375 | flush_cache_range(vma, address, end); |
| 3376 | |
Rik van Riel | a533809 | 2014-04-07 15:36:57 -0700 | [diff] [blame] | 3377 | mmu_notifier_invalidate_range_start(mm, start, end); |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 3378 | i_mmap_lock_write(vma->vm_file->f_mapping); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3379 | for (; address < end; address += huge_page_size(h)) { |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3380 | spinlock_t *ptl; |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3381 | ptep = huge_pte_offset(mm, address); |
| 3382 | if (!ptep) |
| 3383 | continue; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3384 | ptl = huge_pte_lock(h, mm, ptep); |
Peter Zijlstra | 7da4d64 | 2012-11-19 03:14:23 +0100 | [diff] [blame] | 3385 | if (huge_pmd_unshare(mm, &address, ptep)) { |
| 3386 | pages++; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3387 | spin_unlock(ptl); |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 3388 | continue; |
Peter Zijlstra | 7da4d64 | 2012-11-19 03:14:23 +0100 | [diff] [blame] | 3389 | } |
Naoya Horiguchi | a8bda28 | 2015-02-11 15:25:28 -0800 | [diff] [blame] | 3390 | pte = huge_ptep_get(ptep); |
| 3391 | if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) { |
| 3392 | spin_unlock(ptl); |
| 3393 | continue; |
| 3394 | } |
| 3395 | if (unlikely(is_hugetlb_entry_migration(pte))) { |
| 3396 | swp_entry_t entry = pte_to_swp_entry(pte); |
| 3397 | |
| 3398 | if (is_write_migration_entry(entry)) { |
| 3399 | pte_t newpte; |
| 3400 | |
| 3401 | make_migration_entry_read(&entry); |
| 3402 | newpte = swp_entry_to_pte(entry); |
| 3403 | set_huge_pte_at(mm, address, ptep, newpte); |
| 3404 | pages++; |
| 3405 | } |
| 3406 | spin_unlock(ptl); |
| 3407 | continue; |
| 3408 | } |
| 3409 | if (!huge_pte_none(pte)) { |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3410 | pte = huge_ptep_get_and_clear(mm, address, ptep); |
Gerald Schaefer | 106c992 | 2013-04-29 15:07:23 -0700 | [diff] [blame] | 3411 | pte = pte_mkhuge(huge_pte_modify(pte, newprot)); |
Tony Lu | be7517d | 2013-02-04 14:28:46 -0800 | [diff] [blame] | 3412 | pte = arch_make_huge_pte(pte, vma, NULL, 0); |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3413 | set_huge_pte_at(mm, address, ptep, pte); |
Peter Zijlstra | 7da4d64 | 2012-11-19 03:14:23 +0100 | [diff] [blame] | 3414 | pages++; |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3415 | } |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3416 | spin_unlock(ptl); |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3417 | } |
Mel Gorman | d833352 | 2012-07-31 16:46:20 -0700 | [diff] [blame] | 3418 | /* |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 3419 | * Must flush TLB before releasing i_mmap_rwsem: x86's huge_pmd_unshare |
Mel Gorman | d833352 | 2012-07-31 16:46:20 -0700 | [diff] [blame] | 3420 | * may have cleared our pud entry and done put_page on the page table: |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 3421 | * once we release i_mmap_rwsem, another task can do the final put_page |
Mel Gorman | d833352 | 2012-07-31 16:46:20 -0700 | [diff] [blame] | 3422 | * and that page table be reused and filled with junk. |
| 3423 | */ |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3424 | flush_tlb_range(vma, start, end); |
Joerg Roedel | 34ee645 | 2014-11-13 13:46:09 +1100 | [diff] [blame] | 3425 | mmu_notifier_invalidate_range(mm, start, end); |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 3426 | i_mmap_unlock_write(vma->vm_file->f_mapping); |
Rik van Riel | a533809 | 2014-04-07 15:36:57 -0700 | [diff] [blame] | 3427 | mmu_notifier_invalidate_range_end(mm, start, end); |
Peter Zijlstra | 7da4d64 | 2012-11-19 03:14:23 +0100 | [diff] [blame] | 3428 | |
| 3429 | return pages << h->order; |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 3430 | } |
| 3431 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 3432 | int hugetlb_reserve_pages(struct inode *inode, |
| 3433 | long from, long to, |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 3434 | struct vm_area_struct *vma, |
KOSAKI Motohiro | ca16d14 | 2011-05-26 19:16:19 +0900 | [diff] [blame] | 3435 | vm_flags_t vm_flags) |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 3436 | { |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3437 | long ret, chg; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3438 | struct hstate *h = hstate_inode(inode); |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 3439 | struct hugepage_subpool *spool = subpool_inode(inode); |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 3440 | struct resv_map *resv_map; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 3441 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 3442 | /* |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3443 | * Only apply hugepage reservation if asked. At fault time, an |
| 3444 | * attempt will be made for VM_NORESERVE to allocate a page |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 3445 | * without using reserves |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3446 | */ |
KOSAKI Motohiro | ca16d14 | 2011-05-26 19:16:19 +0900 | [diff] [blame] | 3447 | if (vm_flags & VM_NORESERVE) |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3448 | return 0; |
| 3449 | |
| 3450 | /* |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 3451 | * Shared mappings base their reservation on the number of pages that |
| 3452 | * are already allocated on behalf of the file. Private mappings need |
| 3453 | * to reserve the full area even if read-only as mprotect() may be |
| 3454 | * called to make the mapping read-write. Assume !vma is a shm mapping |
| 3455 | */ |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 3456 | if (!vma || vma->vm_flags & VM_MAYSHARE) { |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 3457 | resv_map = inode_resv_map(inode); |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 3458 | |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 3459 | chg = region_chg(resv_map, from, to); |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 3460 | |
| 3461 | } else { |
| 3462 | resv_map = resv_map_alloc(); |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 3463 | if (!resv_map) |
| 3464 | return -ENOMEM; |
| 3465 | |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3466 | chg = to - from; |
| 3467 | |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 3468 | set_vma_resv_map(vma, resv_map); |
| 3469 | set_vma_resv_flags(vma, HPAGE_RESV_OWNER); |
| 3470 | } |
| 3471 | |
Dave Hansen | c50ac05 | 2012-05-29 15:06:46 -0700 | [diff] [blame] | 3472 | if (chg < 0) { |
| 3473 | ret = chg; |
| 3474 | goto out_err; |
| 3475 | } |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3476 | |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 3477 | /* There must be enough pages in the subpool for the mapping */ |
Dave Hansen | c50ac05 | 2012-05-29 15:06:46 -0700 | [diff] [blame] | 3478 | if (hugepage_subpool_get_pages(spool, chg)) { |
| 3479 | ret = -ENOSPC; |
| 3480 | goto out_err; |
| 3481 | } |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3482 | |
| 3483 | /* |
| 3484 | * Check enough hugepages are available for the reservation. |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 3485 | * Hand the pages back to the subpool if there are not |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3486 | */ |
| 3487 | ret = hugetlb_acct_memory(h, chg); |
| 3488 | if (ret < 0) { |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 3489 | hugepage_subpool_put_pages(spool, chg); |
Dave Hansen | c50ac05 | 2012-05-29 15:06:46 -0700 | [diff] [blame] | 3490 | goto out_err; |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 3491 | } |
| 3492 | |
| 3493 | /* |
| 3494 | * Account for the reservations made. Shared mappings record regions |
| 3495 | * that have reservations as they are shared by multiple VMAs. |
| 3496 | * When the last VMA disappears, the region map says how much |
| 3497 | * the reservation was and the page cache tells how much of |
| 3498 | * the reservation was consumed. Private mappings are per-VMA and |
| 3499 | * only the consumed reservations are tracked. When the VMA |
| 3500 | * disappears, the original reservation is the VMA size and the |
| 3501 | * consumed reservations are stored in the map. Hence, nothing |
| 3502 | * else has to be done for private mappings here |
| 3503 | */ |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 3504 | if (!vma || vma->vm_flags & VM_MAYSHARE) |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 3505 | region_add(resv_map, from, to); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 3506 | return 0; |
Dave Hansen | c50ac05 | 2012-05-29 15:06:46 -0700 | [diff] [blame] | 3507 | out_err: |
Joonsoo Kim | f031dd2 | 2014-04-03 14:47:28 -0700 | [diff] [blame] | 3508 | if (vma && is_vma_resv_set(vma, HPAGE_RESV_OWNER)) |
| 3509 | kref_put(&resv_map->refs, resv_map_release); |
Dave Hansen | c50ac05 | 2012-05-29 15:06:46 -0700 | [diff] [blame] | 3510 | return ret; |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 3511 | } |
| 3512 | |
| 3513 | void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed) |
| 3514 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3515 | struct hstate *h = hstate_inode(inode); |
Joonsoo Kim | 4e35f48 | 2014-04-03 14:47:30 -0700 | [diff] [blame] | 3516 | struct resv_map *resv_map = inode_resv_map(inode); |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 3517 | long chg = 0; |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 3518 | struct hugepage_subpool *spool = subpool_inode(inode); |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 3519 | |
Joonsoo Kim | 9119a41 | 2014-04-03 14:47:25 -0700 | [diff] [blame] | 3520 | if (resv_map) |
Joonsoo Kim | 1406ec9 | 2014-04-03 14:47:26 -0700 | [diff] [blame] | 3521 | chg = region_truncate(resv_map, offset); |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 3522 | spin_lock(&inode->i_lock); |
Eric Sandeen | e4c6f8b | 2009-07-29 15:02:16 -0700 | [diff] [blame] | 3523 | inode->i_blocks -= (blocks_per_huge_page(h) * freed); |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 3524 | spin_unlock(&inode->i_lock); |
| 3525 | |
David Gibson | 9048162 | 2012-03-21 16:34:12 -0700 | [diff] [blame] | 3526 | hugepage_subpool_put_pages(spool, (chg - freed)); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 3527 | hugetlb_acct_memory(h, -(chg - freed)); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 3528 | } |
Naoya Horiguchi | 93f70f9 | 2010-05-28 09:29:20 +0900 | [diff] [blame] | 3529 | |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3530 | #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE |
| 3531 | static unsigned long page_table_shareable(struct vm_area_struct *svma, |
| 3532 | struct vm_area_struct *vma, |
| 3533 | unsigned long addr, pgoff_t idx) |
| 3534 | { |
| 3535 | unsigned long saddr = ((idx - svma->vm_pgoff) << PAGE_SHIFT) + |
| 3536 | svma->vm_start; |
| 3537 | unsigned long sbase = saddr & PUD_MASK; |
| 3538 | unsigned long s_end = sbase + PUD_SIZE; |
| 3539 | |
| 3540 | /* Allow segments to share if only one is marked locked */ |
| 3541 | unsigned long vm_flags = vma->vm_flags & ~VM_LOCKED; |
| 3542 | unsigned long svm_flags = svma->vm_flags & ~VM_LOCKED; |
| 3543 | |
| 3544 | /* |
| 3545 | * match the virtual addresses, permission and the alignment of the |
| 3546 | * page table page. |
| 3547 | */ |
| 3548 | if (pmd_index(addr) != pmd_index(saddr) || |
| 3549 | vm_flags != svm_flags || |
| 3550 | sbase < svma->vm_start || svma->vm_end < s_end) |
| 3551 | return 0; |
| 3552 | |
| 3553 | return saddr; |
| 3554 | } |
| 3555 | |
| 3556 | static int vma_shareable(struct vm_area_struct *vma, unsigned long addr) |
| 3557 | { |
| 3558 | unsigned long base = addr & PUD_MASK; |
| 3559 | unsigned long end = base + PUD_SIZE; |
| 3560 | |
| 3561 | /* |
| 3562 | * check on proper vm_flags and page table alignment |
| 3563 | */ |
| 3564 | if (vma->vm_flags & VM_MAYSHARE && |
| 3565 | vma->vm_start <= base && end <= vma->vm_end) |
| 3566 | return 1; |
| 3567 | return 0; |
| 3568 | } |
| 3569 | |
| 3570 | /* |
| 3571 | * Search for a shareable pmd page for hugetlb. In any case calls pmd_alloc() |
| 3572 | * and returns the corresponding pte. While this is not necessary for the |
| 3573 | * !shared pmd case because we can allocate the pmd later as well, it makes the |
| 3574 | * code much cleaner. pmd allocation is essential for the shared case because |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 3575 | * pud has to be populated inside the same i_mmap_rwsem section - otherwise |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3576 | * racing tasks could either miss the sharing (see huge_pte_offset) or select a |
| 3577 | * bad pmd for sharing. |
| 3578 | */ |
| 3579 | pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud) |
| 3580 | { |
| 3581 | struct vm_area_struct *vma = find_vma(mm, addr); |
| 3582 | struct address_space *mapping = vma->vm_file->f_mapping; |
| 3583 | pgoff_t idx = ((addr - vma->vm_start) >> PAGE_SHIFT) + |
| 3584 | vma->vm_pgoff; |
| 3585 | struct vm_area_struct *svma; |
| 3586 | unsigned long saddr; |
| 3587 | pte_t *spte = NULL; |
| 3588 | pte_t *pte; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3589 | spinlock_t *ptl; |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3590 | |
| 3591 | if (!vma_shareable(vma, addr)) |
| 3592 | return (pte_t *)pmd_alloc(mm, pud, addr); |
| 3593 | |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 3594 | i_mmap_lock_write(mapping); |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3595 | vma_interval_tree_foreach(svma, &mapping->i_mmap, idx, idx) { |
| 3596 | if (svma == vma) |
| 3597 | continue; |
| 3598 | |
| 3599 | saddr = page_table_shareable(svma, vma, addr, idx); |
| 3600 | if (saddr) { |
| 3601 | spte = huge_pte_offset(svma->vm_mm, saddr); |
| 3602 | if (spte) { |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 3603 | mm_inc_nr_pmds(mm); |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3604 | get_page(virt_to_page(spte)); |
| 3605 | break; |
| 3606 | } |
| 3607 | } |
| 3608 | } |
| 3609 | |
| 3610 | if (!spte) |
| 3611 | goto out; |
| 3612 | |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3613 | ptl = huge_pte_lockptr(hstate_vma(vma), mm, spte); |
| 3614 | spin_lock(ptl); |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 3615 | if (pud_none(*pud)) { |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3616 | pud_populate(mm, pud, |
| 3617 | (pmd_t *)((unsigned long)spte & PAGE_MASK)); |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 3618 | } else { |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3619 | put_page(virt_to_page(spte)); |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 3620 | mm_inc_nr_pmds(mm); |
| 3621 | } |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3622 | spin_unlock(ptl); |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3623 | out: |
| 3624 | pte = (pte_t *)pmd_alloc(mm, pud, addr); |
Davidlohr Bueso | 83cde9e | 2014-12-12 16:54:21 -0800 | [diff] [blame] | 3625 | i_mmap_unlock_write(mapping); |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3626 | return pte; |
| 3627 | } |
| 3628 | |
| 3629 | /* |
| 3630 | * unmap huge page backed by shared pte. |
| 3631 | * |
| 3632 | * Hugetlb pte page is ref counted at the time of mapping. If pte is shared |
| 3633 | * indicated by page_count > 1, unmap is achieved by clearing pud and |
| 3634 | * decrementing the ref count. If count == 1, the pte page is not shared. |
| 3635 | * |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 3636 | * called with page table lock held. |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3637 | * |
| 3638 | * returns: 1 successfully unmapped a shared pte page |
| 3639 | * 0 the underlying pte page is not shared, or it is the last user |
| 3640 | */ |
| 3641 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
| 3642 | { |
| 3643 | pgd_t *pgd = pgd_offset(mm, *addr); |
| 3644 | pud_t *pud = pud_offset(pgd, *addr); |
| 3645 | |
| 3646 | BUG_ON(page_count(virt_to_page(ptep)) == 0); |
| 3647 | if (page_count(virt_to_page(ptep)) == 1) |
| 3648 | return 0; |
| 3649 | |
| 3650 | pud_clear(pud); |
| 3651 | put_page(virt_to_page(ptep)); |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 3652 | mm_dec_nr_pmds(mm); |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3653 | *addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE; |
| 3654 | return 1; |
| 3655 | } |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3656 | #define want_pmd_share() (1) |
| 3657 | #else /* !CONFIG_ARCH_WANT_HUGE_PMD_SHARE */ |
| 3658 | pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud) |
| 3659 | { |
| 3660 | return NULL; |
| 3661 | } |
| 3662 | #define want_pmd_share() (0) |
Steve Capper | 3212b53 | 2013-04-23 12:35:02 +0100 | [diff] [blame] | 3663 | #endif /* CONFIG_ARCH_WANT_HUGE_PMD_SHARE */ |
| 3664 | |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3665 | #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB |
| 3666 | pte_t *huge_pte_alloc(struct mm_struct *mm, |
| 3667 | unsigned long addr, unsigned long sz) |
| 3668 | { |
| 3669 | pgd_t *pgd; |
| 3670 | pud_t *pud; |
| 3671 | pte_t *pte = NULL; |
| 3672 | |
| 3673 | pgd = pgd_offset(mm, addr); |
| 3674 | pud = pud_alloc(mm, pgd, addr); |
| 3675 | if (pud) { |
| 3676 | if (sz == PUD_SIZE) { |
| 3677 | pte = (pte_t *)pud; |
| 3678 | } else { |
| 3679 | BUG_ON(sz != PMD_SIZE); |
| 3680 | if (want_pmd_share() && pud_none(*pud)) |
| 3681 | pte = huge_pmd_share(mm, addr, pud); |
| 3682 | else |
| 3683 | pte = (pte_t *)pmd_alloc(mm, pud, addr); |
| 3684 | } |
| 3685 | } |
| 3686 | BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte)); |
| 3687 | |
| 3688 | return pte; |
| 3689 | } |
| 3690 | |
| 3691 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) |
| 3692 | { |
| 3693 | pgd_t *pgd; |
| 3694 | pud_t *pud; |
| 3695 | pmd_t *pmd = NULL; |
| 3696 | |
| 3697 | pgd = pgd_offset(mm, addr); |
| 3698 | if (pgd_present(*pgd)) { |
| 3699 | pud = pud_offset(pgd, addr); |
| 3700 | if (pud_present(*pud)) { |
| 3701 | if (pud_huge(*pud)) |
| 3702 | return (pte_t *)pud; |
| 3703 | pmd = pmd_offset(pud, addr); |
| 3704 | } |
| 3705 | } |
| 3706 | return (pte_t *) pmd; |
| 3707 | } |
| 3708 | |
Naoya Horiguchi | 61f77ed | 2015-02-11 15:25:15 -0800 | [diff] [blame] | 3709 | #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ |
| 3710 | |
| 3711 | /* |
| 3712 | * These functions are overwritable if your architecture needs its own |
| 3713 | * behavior. |
| 3714 | */ |
| 3715 | struct page * __weak |
| 3716 | follow_huge_addr(struct mm_struct *mm, unsigned long address, |
| 3717 | int write) |
| 3718 | { |
| 3719 | return ERR_PTR(-EINVAL); |
| 3720 | } |
| 3721 | |
| 3722 | struct page * __weak |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3723 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, |
Naoya Horiguchi | e66f17f | 2015-02-11 15:25:22 -0800 | [diff] [blame] | 3724 | pmd_t *pmd, int flags) |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3725 | { |
Naoya Horiguchi | e66f17f | 2015-02-11 15:25:22 -0800 | [diff] [blame] | 3726 | struct page *page = NULL; |
| 3727 | spinlock_t *ptl; |
| 3728 | retry: |
| 3729 | ptl = pmd_lockptr(mm, pmd); |
| 3730 | spin_lock(ptl); |
| 3731 | /* |
| 3732 | * make sure that the address range covered by this pmd is not |
| 3733 | * unmapped from other threads. |
| 3734 | */ |
| 3735 | if (!pmd_huge(*pmd)) |
| 3736 | goto out; |
| 3737 | if (pmd_present(*pmd)) { |
| 3738 | page = pte_page(*(pte_t *)pmd) + |
| 3739 | ((address & ~PMD_MASK) >> PAGE_SHIFT); |
| 3740 | if (flags & FOLL_GET) |
| 3741 | get_page(page); |
| 3742 | } else { |
| 3743 | if (is_hugetlb_entry_migration(huge_ptep_get((pte_t *)pmd))) { |
| 3744 | spin_unlock(ptl); |
| 3745 | __migration_entry_wait(mm, (pte_t *)pmd, ptl); |
| 3746 | goto retry; |
| 3747 | } |
| 3748 | /* |
| 3749 | * hwpoisoned entry is treated as no_page_table in |
| 3750 | * follow_page_mask(). |
| 3751 | */ |
| 3752 | } |
| 3753 | out: |
| 3754 | spin_unlock(ptl); |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3755 | return page; |
| 3756 | } |
| 3757 | |
Naoya Horiguchi | 61f77ed | 2015-02-11 15:25:15 -0800 | [diff] [blame] | 3758 | struct page * __weak |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3759 | follow_huge_pud(struct mm_struct *mm, unsigned long address, |
Naoya Horiguchi | e66f17f | 2015-02-11 15:25:22 -0800 | [diff] [blame] | 3760 | pud_t *pud, int flags) |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3761 | { |
Naoya Horiguchi | e66f17f | 2015-02-11 15:25:22 -0800 | [diff] [blame] | 3762 | if (flags & FOLL_GET) |
| 3763 | return NULL; |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3764 | |
Naoya Horiguchi | e66f17f | 2015-02-11 15:25:22 -0800 | [diff] [blame] | 3765 | return pte_page(*(pte_t *)pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); |
Steve Capper | 9e5fc74 | 2013-04-30 08:02:03 +0100 | [diff] [blame] | 3766 | } |
| 3767 | |
Andi Kleen | d5bd910 | 2010-09-27 09:00:12 +0200 | [diff] [blame] | 3768 | #ifdef CONFIG_MEMORY_FAILURE |
| 3769 | |
Naoya Horiguchi | 6de2b1a | 2010-09-08 10:19:36 +0900 | [diff] [blame] | 3770 | /* Should be called in hugetlb_lock */ |
| 3771 | static int is_hugepage_on_freelist(struct page *hpage) |
| 3772 | { |
| 3773 | struct page *page; |
| 3774 | struct page *tmp; |
| 3775 | struct hstate *h = page_hstate(hpage); |
| 3776 | int nid = page_to_nid(hpage); |
| 3777 | |
| 3778 | list_for_each_entry_safe(page, tmp, &h->hugepage_freelists[nid], lru) |
| 3779 | if (page == hpage) |
| 3780 | return 1; |
| 3781 | return 0; |
| 3782 | } |
| 3783 | |
Naoya Horiguchi | 93f70f9 | 2010-05-28 09:29:20 +0900 | [diff] [blame] | 3784 | /* |
| 3785 | * This function is called from memory failure code. |
| 3786 | * Assume the caller holds page lock of the head page. |
| 3787 | */ |
Naoya Horiguchi | 6de2b1a | 2010-09-08 10:19:36 +0900 | [diff] [blame] | 3788 | int dequeue_hwpoisoned_huge_page(struct page *hpage) |
Naoya Horiguchi | 93f70f9 | 2010-05-28 09:29:20 +0900 | [diff] [blame] | 3789 | { |
| 3790 | struct hstate *h = page_hstate(hpage); |
| 3791 | int nid = page_to_nid(hpage); |
Naoya Horiguchi | 6de2b1a | 2010-09-08 10:19:36 +0900 | [diff] [blame] | 3792 | int ret = -EBUSY; |
Naoya Horiguchi | 93f70f9 | 2010-05-28 09:29:20 +0900 | [diff] [blame] | 3793 | |
| 3794 | spin_lock(&hugetlb_lock); |
Naoya Horiguchi | 6de2b1a | 2010-09-08 10:19:36 +0900 | [diff] [blame] | 3795 | if (is_hugepage_on_freelist(hpage)) { |
Naoya Horiguchi | 56f2fb1 | 2012-12-12 13:52:33 -0800 | [diff] [blame] | 3796 | /* |
| 3797 | * Hwpoisoned hugepage isn't linked to activelist or freelist, |
| 3798 | * but dangling hpage->lru can trigger list-debug warnings |
| 3799 | * (this happens when we call unpoison_memory() on it), |
| 3800 | * so let it point to itself with list_del_init(). |
| 3801 | */ |
| 3802 | list_del_init(&hpage->lru); |
Naoya Horiguchi | 8c6c2ec | 2010-09-08 10:19:38 +0900 | [diff] [blame] | 3803 | set_page_refcounted(hpage); |
Naoya Horiguchi | 6de2b1a | 2010-09-08 10:19:36 +0900 | [diff] [blame] | 3804 | h->free_huge_pages--; |
| 3805 | h->free_huge_pages_node[nid]--; |
| 3806 | ret = 0; |
| 3807 | } |
Naoya Horiguchi | 93f70f9 | 2010-05-28 09:29:20 +0900 | [diff] [blame] | 3808 | spin_unlock(&hugetlb_lock); |
Naoya Horiguchi | 6de2b1a | 2010-09-08 10:19:36 +0900 | [diff] [blame] | 3809 | return ret; |
Naoya Horiguchi | 93f70f9 | 2010-05-28 09:29:20 +0900 | [diff] [blame] | 3810 | } |
Naoya Horiguchi | 6de2b1a | 2010-09-08 10:19:36 +0900 | [diff] [blame] | 3811 | #endif |
Naoya Horiguchi | 31caf66 | 2013-09-11 14:21:59 -0700 | [diff] [blame] | 3812 | |
| 3813 | bool isolate_huge_page(struct page *page, struct list_head *list) |
| 3814 | { |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 3815 | VM_BUG_ON_PAGE(!PageHead(page), page); |
Naoya Horiguchi | 31caf66 | 2013-09-11 14:21:59 -0700 | [diff] [blame] | 3816 | if (!get_page_unless_zero(page)) |
| 3817 | return false; |
| 3818 | spin_lock(&hugetlb_lock); |
| 3819 | list_move_tail(&page->lru, list); |
| 3820 | spin_unlock(&hugetlb_lock); |
| 3821 | return true; |
| 3822 | } |
| 3823 | |
| 3824 | void putback_active_hugepage(struct page *page) |
| 3825 | { |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 3826 | VM_BUG_ON_PAGE(!PageHead(page), page); |
Naoya Horiguchi | 31caf66 | 2013-09-11 14:21:59 -0700 | [diff] [blame] | 3827 | spin_lock(&hugetlb_lock); |
| 3828 | list_move_tail(&page->lru, &(page_hstate(page))->hugepage_activelist); |
| 3829 | spin_unlock(&hugetlb_lock); |
| 3830 | put_page(page); |
| 3831 | } |
Naoya Horiguchi | c8721bb | 2013-09-11 14:22:09 -0700 | [diff] [blame] | 3832 | |
| 3833 | bool is_hugepage_active(struct page *page) |
| 3834 | { |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 3835 | VM_BUG_ON_PAGE(!PageHuge(page), page); |
Naoya Horiguchi | c8721bb | 2013-09-11 14:22:09 -0700 | [diff] [blame] | 3836 | /* |
| 3837 | * This function can be called for a tail page because the caller, |
| 3838 | * scan_movable_pages, scans through a given pfn-range which typically |
| 3839 | * covers one memory block. In systems using gigantic hugepage (1GB |
| 3840 | * for x86_64,) a hugepage is larger than a memory block, and we don't |
| 3841 | * support migrating such large hugepages for now, so return false |
| 3842 | * when called for tail pages. |
| 3843 | */ |
| 3844 | if (PageTail(page)) |
| 3845 | return false; |
| 3846 | /* |
| 3847 | * Refcount of a hwpoisoned hugepages is 1, but they are not active, |
| 3848 | * so we should return false for them. |
| 3849 | */ |
| 3850 | if (unlikely(PageHWPoison(page))) |
| 3851 | return false; |
| 3852 | return page_count(page) > 0; |
| 3853 | } |