mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status
Currently there's no easy way to get per-process usage of hugetlb pages,
which is inconvenient because userspace applications which use hugetlb
typically want to control their processes on the basis of how much memory
(including hugetlb) they use. So this patch simply provides easy access
to the info via /proc/PID/status.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Joern Engel <joern@logfs.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9cc7734..abfbe8c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2790,6 +2790,12 @@
1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
}
+void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm)
+{
+ seq_printf(m, "HugetlbPages:\t%8lu kB\n",
+ atomic_long_read(&mm->hugetlb_usage) << (PAGE_SHIFT - 10));
+}
+
/* Return the number pages of memory we physically have, in PAGE_SIZE units. */
unsigned long hugetlb_total_pages(void)
{
@@ -3025,6 +3031,7 @@
get_page(ptepage);
page_dup_rmap(ptepage);
set_huge_pte_at(dst, addr, dst_pte, entry);
+ hugetlb_count_add(pages_per_huge_page(h), dst);
}
spin_unlock(src_ptl);
spin_unlock(dst_ptl);
@@ -3105,6 +3112,7 @@
if (huge_pte_dirty(pte))
set_page_dirty(page);
+ hugetlb_count_sub(pages_per_huge_page(h), mm);
page_remove_rmap(page);
force_flush = !__tlb_remove_page(tlb, page);
if (force_flush) {
@@ -3509,6 +3517,7 @@
&& (vma->vm_flags & VM_SHARED)));
set_huge_pte_at(mm, address, ptep, new_pte);
+ hugetlb_count_add(pages_per_huge_page(h), mm);
if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) {
/* Optimization, do the COW without a second fault */
ret = hugetlb_cow(mm, vma, address, ptep, new_pte, page, ptl);