Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1 | /* |
Paul E. McKenney | 29766f1 | 2006-06-27 02:54:02 -0700 | [diff] [blame] | 2 | * Read-Copy Update module-based torture test facility |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | * |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 18 | * Copyright (C) IBM Corporation, 2005, 2006 |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 19 | * |
| 20 | * Authors: Paul E. McKenney <paulmck@us.ibm.com> |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 21 | * Josh Triplett <josh@freedesktop.org> |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 22 | * |
| 23 | * See also: Documentation/RCU/torture.txt |
| 24 | */ |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/kthread.h> |
| 30 | #include <linux/err.h> |
| 31 | #include <linux/spinlock.h> |
| 32 | #include <linux/smp.h> |
| 33 | #include <linux/rcupdate.h> |
| 34 | #include <linux/interrupt.h> |
| 35 | #include <linux/sched.h> |
| 36 | #include <asm/atomic.h> |
| 37 | #include <linux/bitops.h> |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 38 | #include <linux/completion.h> |
| 39 | #include <linux/moduleparam.h> |
| 40 | #include <linux/percpu.h> |
| 41 | #include <linux/notifier.h> |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 42 | #include <linux/reboot.h> |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 43 | #include <linux/freezer.h> |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 44 | #include <linux/cpu.h> |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 45 | #include <linux/delay.h> |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 46 | #include <linux/stat.h> |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 47 | #include <linux/srcu.h> |
Robert P. J. Day | 1aeb272 | 2008-04-29 00:59:25 -0700 | [diff] [blame] | 48 | #include <linux/slab.h> |
Harvey Harrison | f07767f | 2008-10-20 10:23:38 -0700 | [diff] [blame] | 49 | #include <asm/byteorder.h> |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 50 | |
| 51 | MODULE_LICENSE("GPL"); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 52 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and " |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 53 | "Josh Triplett <josh@freedesktop.org>"); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 54 | |
Josh Triplett | 4802211 | 2006-10-03 23:26:16 +0200 | [diff] [blame] | 55 | static int nreaders = -1; /* # reader threads, defaults to 2*ncpus */ |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 56 | static int nfakewriters = 4; /* # fake writer threads */ |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 57 | static int stat_interval; /* Interval between stats, in seconds. */ |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 58 | /* Defaults to "only at end of test". */ |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 59 | static int verbose; /* Print more debug info. */ |
| 60 | static int test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */ |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 61 | static int shuffle_interval = 3; /* Interval between shuffles (in sec)*/ |
| 62 | static int stutter = 5; /* Start/stop testing interval (in sec) */ |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 63 | static int irqreader = 1; /* RCU readers from irq (timers). */ |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 64 | static int fqs_duration = 0; /* Duration of bursts (us), 0 to disable. */ |
| 65 | static int fqs_holdoff = 0; /* Hold time within burst (us). */ |
| 66 | static int fqs_stutter = 3; /* Wait time between bursts (s). */ |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 67 | static int test_boost = 1; /* Test RCU prio boost: 0=no, 1=maybe, 2=yes. */ |
| 68 | static int test_boost_interval = 7; /* Interval between boost tests, seconds. */ |
| 69 | static int test_boost_duration = 4; /* Duration of each boost test, seconds. */ |
Josh Triplett | 20d2e42 | 2006-10-04 02:17:15 -0700 | [diff] [blame] | 70 | static char *torture_type = "rcu"; /* What RCU implementation to torture. */ |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 71 | |
Josh Triplett | d6ad671 | 2007-03-06 01:42:13 -0800 | [diff] [blame] | 72 | module_param(nreaders, int, 0444); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 73 | MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); |
Josh Triplett | d6ad671 | 2007-03-06 01:42:13 -0800 | [diff] [blame] | 74 | module_param(nfakewriters, int, 0444); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 75 | MODULE_PARM_DESC(nfakewriters, "Number of RCU fake writer threads"); |
Josh Triplett | d6ad671 | 2007-03-06 01:42:13 -0800 | [diff] [blame] | 76 | module_param(stat_interval, int, 0444); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 77 | MODULE_PARM_DESC(stat_interval, "Number of seconds between stats printk()s"); |
Josh Triplett | d6ad671 | 2007-03-06 01:42:13 -0800 | [diff] [blame] | 78 | module_param(verbose, bool, 0444); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 79 | MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); |
Josh Triplett | d6ad671 | 2007-03-06 01:42:13 -0800 | [diff] [blame] | 80 | module_param(test_no_idle_hz, bool, 0444); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 81 | MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs"); |
Josh Triplett | d6ad671 | 2007-03-06 01:42:13 -0800 | [diff] [blame] | 82 | module_param(shuffle_interval, int, 0444); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 83 | MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles"); |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 84 | module_param(stutter, int, 0444); |
| 85 | MODULE_PARM_DESC(stutter, "Number of seconds to run/halt test"); |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 86 | module_param(irqreader, int, 0444); |
| 87 | MODULE_PARM_DESC(irqreader, "Allow RCU readers from irq handlers"); |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 88 | module_param(fqs_duration, int, 0444); |
| 89 | MODULE_PARM_DESC(fqs_duration, "Duration of fqs bursts (us)"); |
| 90 | module_param(fqs_holdoff, int, 0444); |
| 91 | MODULE_PARM_DESC(fqs_holdoff, "Holdoff time within fqs bursts (us)"); |
| 92 | module_param(fqs_stutter, int, 0444); |
| 93 | MODULE_PARM_DESC(fqs_stutter, "Wait time between fqs bursts (s)"); |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 94 | module_param(test_boost, int, 0444); |
| 95 | MODULE_PARM_DESC(test_boost, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); |
| 96 | module_param(test_boost_interval, int, 0444); |
| 97 | MODULE_PARM_DESC(test_boost_interval, "Interval between boost tests, seconds."); |
| 98 | module_param(test_boost_duration, int, 0444); |
| 99 | MODULE_PARM_DESC(test_boost_duration, "Duration of each boost test, seconds."); |
Josh Triplett | d6ad671 | 2007-03-06 01:42:13 -0800 | [diff] [blame] | 100 | module_param(torture_type, charp, 0444); |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 101 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, srcu)"); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 102 | |
| 103 | #define TORTURE_FLAG "-torture:" |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 104 | #define PRINTK_STRING(s) \ |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 105 | do { printk(KERN_ALERT "%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 106 | #define VERBOSE_PRINTK_STRING(s) \ |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 107 | do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 108 | #define VERBOSE_PRINTK_ERRSTRING(s) \ |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 109 | do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG "!!! " s "\n", torture_type); } while (0) |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 110 | |
| 111 | static char printk_buf[4096]; |
| 112 | |
| 113 | static int nrealreaders; |
| 114 | static struct task_struct *writer_task; |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 115 | static struct task_struct **fakewriter_tasks; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 116 | static struct task_struct **reader_tasks; |
| 117 | static struct task_struct *stats_task; |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 118 | static struct task_struct *shuffler_task; |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 119 | static struct task_struct *stutter_task; |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 120 | static struct task_struct *fqs_task; |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 121 | static struct task_struct *boost_tasks[NR_CPUS]; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 122 | |
| 123 | #define RCU_TORTURE_PIPE_LEN 10 |
| 124 | |
| 125 | struct rcu_torture { |
| 126 | struct rcu_head rtort_rcu; |
| 127 | int rtort_pipe_count; |
| 128 | struct list_head rtort_free; |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 129 | int rtort_mbtest; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 130 | }; |
| 131 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 132 | static LIST_HEAD(rcu_torture_freelist); |
Paul E. McKenney | 0ddea0e | 2010-09-19 21:06:14 -0700 | [diff] [blame] | 133 | static struct rcu_torture __rcu *rcu_torture_current; |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 134 | static long rcu_torture_current_version; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 135 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
| 136 | static DEFINE_SPINLOCK(rcu_torture_lock); |
| 137 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count) = |
| 138 | { 0 }; |
| 139 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch) = |
| 140 | { 0 }; |
| 141 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 142 | static atomic_t n_rcu_torture_alloc; |
| 143 | static atomic_t n_rcu_torture_alloc_fail; |
| 144 | static atomic_t n_rcu_torture_free; |
| 145 | static atomic_t n_rcu_torture_mberror; |
| 146 | static atomic_t n_rcu_torture_error; |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 147 | static long n_rcu_torture_boost_ktrerror; |
| 148 | static long n_rcu_torture_boost_rterror; |
| 149 | static long n_rcu_torture_boost_allocerror; |
| 150 | static long n_rcu_torture_boost_afferror; |
| 151 | static long n_rcu_torture_boost_failure; |
| 152 | static long n_rcu_torture_boosts; |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 153 | static long n_rcu_torture_timers; |
Josh Triplett | e303373 | 2006-10-04 02:17:14 -0700 | [diff] [blame] | 154 | static struct list_head rcu_torture_removed; |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 155 | static cpumask_var_t shuffle_tmp_mask; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 156 | |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 157 | static int stutter_pause_test; |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 158 | |
Paul E. McKenney | 31a72bc | 2008-06-18 09:26:49 -0700 | [diff] [blame] | 159 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
| 160 | #define RCUTORTURE_RUNNABLE_INIT 1 |
| 161 | #else |
| 162 | #define RCUTORTURE_RUNNABLE_INIT 0 |
| 163 | #endif |
| 164 | int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; |
| 165 | |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 166 | #ifdef CONFIG_RCU_BOOST |
| 167 | #define rcu_can_boost() 1 |
| 168 | #else /* #ifdef CONFIG_RCU_BOOST */ |
| 169 | #define rcu_can_boost() 0 |
| 170 | #endif /* #else #ifdef CONFIG_RCU_BOOST */ |
| 171 | |
| 172 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
| 173 | DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ |
| 174 | /* and boost task create/destroy. */ |
| 175 | |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 176 | /* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */ |
| 177 | |
| 178 | #define FULLSTOP_DONTSTOP 0 /* Normal operation. */ |
| 179 | #define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */ |
| 180 | #define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */ |
| 181 | static int fullstop = FULLSTOP_RMMOD; |
Paul E. McKenney | 0ddea0e | 2010-09-19 21:06:14 -0700 | [diff] [blame] | 182 | /* |
| 183 | * Protect fullstop transitions and spawning of kthreads. |
| 184 | */ |
| 185 | static DEFINE_MUTEX(fullstop_mutex); |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 186 | |
| 187 | /* |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 188 | * Detect and respond to a system shutdown. |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 189 | */ |
| 190 | static int |
| 191 | rcutorture_shutdown_notify(struct notifier_block *unused1, |
| 192 | unsigned long unused2, void *unused3) |
| 193 | { |
Paul E. McKenney | c59ab97 | 2009-01-04 18:28:27 -0800 | [diff] [blame] | 194 | mutex_lock(&fullstop_mutex); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 195 | if (fullstop == FULLSTOP_DONTSTOP) |
Paul E. McKenney | c59ab97 | 2009-01-04 18:28:27 -0800 | [diff] [blame] | 196 | fullstop = FULLSTOP_SHUTDOWN; |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 197 | else |
| 198 | printk(KERN_WARNING /* but going down anyway, so... */ |
| 199 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
Paul E. McKenney | c59ab97 | 2009-01-04 18:28:27 -0800 | [diff] [blame] | 200 | mutex_unlock(&fullstop_mutex); |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 201 | return NOTIFY_DONE; |
| 202 | } |
| 203 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 204 | /* |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 205 | * Absorb kthreads into a kernel function that won't return, so that |
| 206 | * they won't ever access module text or data again. |
| 207 | */ |
| 208 | static void rcutorture_shutdown_absorb(char *title) |
| 209 | { |
| 210 | if (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { |
| 211 | printk(KERN_NOTICE |
| 212 | "rcutorture thread %s parking due to system shutdown\n", |
| 213 | title); |
| 214 | schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | /* |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 219 | * Allocate an element from the rcu_tortures pool. |
| 220 | */ |
Adrian Bunk | 97a41e2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 221 | static struct rcu_torture * |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 222 | rcu_torture_alloc(void) |
| 223 | { |
| 224 | struct list_head *p; |
| 225 | |
Ingo Molnar | adac166 | 2006-01-25 19:50:12 +0100 | [diff] [blame] | 226 | spin_lock_bh(&rcu_torture_lock); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 227 | if (list_empty(&rcu_torture_freelist)) { |
| 228 | atomic_inc(&n_rcu_torture_alloc_fail); |
Ingo Molnar | adac166 | 2006-01-25 19:50:12 +0100 | [diff] [blame] | 229 | spin_unlock_bh(&rcu_torture_lock); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 230 | return NULL; |
| 231 | } |
| 232 | atomic_inc(&n_rcu_torture_alloc); |
| 233 | p = rcu_torture_freelist.next; |
| 234 | list_del_init(p); |
Ingo Molnar | adac166 | 2006-01-25 19:50:12 +0100 | [diff] [blame] | 235 | spin_unlock_bh(&rcu_torture_lock); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 236 | return container_of(p, struct rcu_torture, rtort_free); |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Free an element to the rcu_tortures pool. |
| 241 | */ |
| 242 | static void |
| 243 | rcu_torture_free(struct rcu_torture *p) |
| 244 | { |
| 245 | atomic_inc(&n_rcu_torture_free); |
Ingo Molnar | adac166 | 2006-01-25 19:50:12 +0100 | [diff] [blame] | 246 | spin_lock_bh(&rcu_torture_lock); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 247 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
Ingo Molnar | adac166 | 2006-01-25 19:50:12 +0100 | [diff] [blame] | 248 | spin_unlock_bh(&rcu_torture_lock); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 249 | } |
| 250 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 251 | struct rcu_random_state { |
| 252 | unsigned long rrs_state; |
Josh Triplett | 75cfef3 | 2006-10-04 02:17:12 -0700 | [diff] [blame] | 253 | long rrs_count; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 254 | }; |
| 255 | |
| 256 | #define RCU_RANDOM_MULT 39916801 /* prime */ |
| 257 | #define RCU_RANDOM_ADD 479001701 /* prime */ |
| 258 | #define RCU_RANDOM_REFRESH 10000 |
| 259 | |
| 260 | #define DEFINE_RCU_RANDOM(name) struct rcu_random_state name = { 0, 0 } |
| 261 | |
| 262 | /* |
| 263 | * Crude but fast random-number generator. Uses a linear congruential |
Paul E. McKenney | c17ac85 | 2007-10-16 23:27:19 -0700 | [diff] [blame] | 264 | * generator, with occasional help from cpu_clock(). |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 265 | */ |
Josh Triplett | 75cfef3 | 2006-10-04 02:17:12 -0700 | [diff] [blame] | 266 | static unsigned long |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 267 | rcu_random(struct rcu_random_state *rrsp) |
| 268 | { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 269 | if (--rrsp->rrs_count < 0) { |
Peter Zijlstra | c676329 | 2010-05-25 10:48:51 +0200 | [diff] [blame] | 270 | rrsp->rrs_state += (unsigned long)local_clock(); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 271 | rrsp->rrs_count = RCU_RANDOM_REFRESH; |
| 272 | } |
| 273 | rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD; |
| 274 | return swahw32(rrsp->rrs_state); |
| 275 | } |
| 276 | |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 277 | static void |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 278 | rcu_stutter_wait(char *title) |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 279 | { |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 280 | while (stutter_pause_test || !rcutorture_runnable) { |
Paul E. McKenney | e3d7be2 | 2008-06-22 13:06:38 -0700 | [diff] [blame] | 281 | if (rcutorture_runnable) |
| 282 | schedule_timeout_interruptible(1); |
| 283 | else |
Paul E. McKenney | 3ccf79f | 2008-06-22 14:02:55 -0700 | [diff] [blame] | 284 | schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 285 | rcutorture_shutdown_absorb(title); |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 286 | } |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 287 | } |
| 288 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 289 | /* |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 290 | * Operations vector for selecting different types of tests. |
| 291 | */ |
| 292 | |
| 293 | struct rcu_torture_ops { |
| 294 | void (*init)(void); |
| 295 | void (*cleanup)(void); |
| 296 | int (*readlock)(void); |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 297 | void (*read_delay)(struct rcu_random_state *rrsp); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 298 | void (*readunlock)(int idx); |
| 299 | int (*completed)(void); |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 300 | void (*deferred_free)(struct rcu_torture *p); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 301 | void (*sync)(void); |
Paul E. McKenney | 2326974 | 2008-05-12 21:21:05 +0200 | [diff] [blame] | 302 | void (*cb_barrier)(void); |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 303 | void (*fqs)(void); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 304 | int (*stats)(char *page); |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 305 | int irq_capable; |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 306 | int can_boost; |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 307 | char *name; |
| 308 | }; |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 309 | |
| 310 | static struct rcu_torture_ops *cur_ops; |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 311 | |
| 312 | /* |
| 313 | * Definitions for rcu torture testing. |
| 314 | */ |
| 315 | |
Josh Triplett | a49a4af | 2006-09-29 01:59:30 -0700 | [diff] [blame] | 316 | static int rcu_torture_read_lock(void) __acquires(RCU) |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 317 | { |
| 318 | rcu_read_lock(); |
| 319 | return 0; |
| 320 | } |
| 321 | |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 322 | static void rcu_read_delay(struct rcu_random_state *rrsp) |
| 323 | { |
Josh Triplett | b8d57a7 | 2009-09-08 15:54:35 -0700 | [diff] [blame] | 324 | const unsigned long shortdelay_us = 200; |
| 325 | const unsigned long longdelay_ms = 50; |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 326 | |
Josh Triplett | b8d57a7 | 2009-09-08 15:54:35 -0700 | [diff] [blame] | 327 | /* We want a short delay sometimes to make a reader delay the grace |
| 328 | * period, and we want a long delay occasionally to trigger |
| 329 | * force_quiescent_state. */ |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 330 | |
Josh Triplett | b8d57a7 | 2009-09-08 15:54:35 -0700 | [diff] [blame] | 331 | if (!(rcu_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
| 332 | mdelay(longdelay_ms); |
| 333 | if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
| 334 | udelay(shortdelay_us); |
Lai Jiangshan | e546f48 | 2010-06-21 16:57:42 +0800 | [diff] [blame] | 335 | #ifdef CONFIG_PREEMPT |
| 336 | if (!preempt_count() && !(rcu_random(rrsp) % (nrealreaders * 20000))) |
| 337 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
| 338 | #endif |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 339 | } |
| 340 | |
Josh Triplett | a49a4af | 2006-09-29 01:59:30 -0700 | [diff] [blame] | 341 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 342 | { |
| 343 | rcu_read_unlock(); |
| 344 | } |
| 345 | |
| 346 | static int rcu_torture_completed(void) |
| 347 | { |
| 348 | return rcu_batches_completed(); |
| 349 | } |
| 350 | |
| 351 | static void |
| 352 | rcu_torture_cb(struct rcu_head *p) |
| 353 | { |
| 354 | int i; |
| 355 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
| 356 | |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 357 | if (fullstop != FULLSTOP_DONTSTOP) { |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 358 | /* Test is ending, just drop callbacks on the floor. */ |
| 359 | /* The next initialization will pick up the pieces. */ |
| 360 | return; |
| 361 | } |
| 362 | i = rp->rtort_pipe_count; |
| 363 | if (i > RCU_TORTURE_PIPE_LEN) |
| 364 | i = RCU_TORTURE_PIPE_LEN; |
| 365 | atomic_inc(&rcu_torture_wcount[i]); |
| 366 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { |
| 367 | rp->rtort_mbtest = 0; |
| 368 | rcu_torture_free(rp); |
| 369 | } else |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 370 | cur_ops->deferred_free(rp); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Paul E. McKenney | d9a3da0 | 2009-12-02 12:10:15 -0800 | [diff] [blame] | 373 | static int rcu_no_completed(void) |
| 374 | { |
| 375 | return 0; |
| 376 | } |
| 377 | |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 378 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
| 379 | { |
| 380 | call_rcu(&p->rtort_rcu, rcu_torture_cb); |
| 381 | } |
| 382 | |
| 383 | static struct rcu_torture_ops rcu_ops = { |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 384 | .init = NULL, |
| 385 | .cleanup = NULL, |
| 386 | .readlock = rcu_torture_read_lock, |
| 387 | .read_delay = rcu_read_delay, |
| 388 | .readunlock = rcu_torture_read_unlock, |
| 389 | .completed = rcu_torture_completed, |
| 390 | .deferred_free = rcu_torture_deferred_free, |
| 391 | .sync = synchronize_rcu, |
| 392 | .cb_barrier = rcu_barrier, |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 393 | .fqs = rcu_force_quiescent_state, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 394 | .stats = NULL, |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 395 | .irq_capable = 1, |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 396 | .can_boost = rcu_can_boost(), |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 397 | .name = "rcu" |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 398 | }; |
| 399 | |
Josh Triplett | e303373 | 2006-10-04 02:17:14 -0700 | [diff] [blame] | 400 | static void rcu_sync_torture_deferred_free(struct rcu_torture *p) |
| 401 | { |
| 402 | int i; |
| 403 | struct rcu_torture *rp; |
| 404 | struct rcu_torture *rp1; |
| 405 | |
| 406 | cur_ops->sync(); |
| 407 | list_add(&p->rtort_free, &rcu_torture_removed); |
| 408 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { |
| 409 | i = rp->rtort_pipe_count; |
| 410 | if (i > RCU_TORTURE_PIPE_LEN) |
| 411 | i = RCU_TORTURE_PIPE_LEN; |
| 412 | atomic_inc(&rcu_torture_wcount[i]); |
| 413 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { |
| 414 | rp->rtort_mbtest = 0; |
| 415 | list_del(&rp->rtort_free); |
| 416 | rcu_torture_free(rp); |
| 417 | } |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | static void rcu_sync_torture_init(void) |
| 422 | { |
| 423 | INIT_LIST_HEAD(&rcu_torture_removed); |
| 424 | } |
| 425 | |
Josh Triplett | 20d2e42 | 2006-10-04 02:17:15 -0700 | [diff] [blame] | 426 | static struct rcu_torture_ops rcu_sync_ops = { |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 427 | .init = rcu_sync_torture_init, |
| 428 | .cleanup = NULL, |
| 429 | .readlock = rcu_torture_read_lock, |
| 430 | .read_delay = rcu_read_delay, |
| 431 | .readunlock = rcu_torture_read_unlock, |
| 432 | .completed = rcu_torture_completed, |
| 433 | .deferred_free = rcu_sync_torture_deferred_free, |
| 434 | .sync = synchronize_rcu, |
| 435 | .cb_barrier = NULL, |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 436 | .fqs = rcu_force_quiescent_state, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 437 | .stats = NULL, |
| 438 | .irq_capable = 1, |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 439 | .can_boost = rcu_can_boost(), |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 440 | .name = "rcu_sync" |
Josh Triplett | 20d2e42 | 2006-10-04 02:17:15 -0700 | [diff] [blame] | 441 | }; |
| 442 | |
Paul E. McKenney | d9a3da0 | 2009-12-02 12:10:15 -0800 | [diff] [blame] | 443 | static struct rcu_torture_ops rcu_expedited_ops = { |
| 444 | .init = rcu_sync_torture_init, |
| 445 | .cleanup = NULL, |
| 446 | .readlock = rcu_torture_read_lock, |
| 447 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ |
| 448 | .readunlock = rcu_torture_read_unlock, |
| 449 | .completed = rcu_no_completed, |
| 450 | .deferred_free = rcu_sync_torture_deferred_free, |
| 451 | .sync = synchronize_rcu_expedited, |
| 452 | .cb_barrier = NULL, |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 453 | .fqs = rcu_force_quiescent_state, |
Paul E. McKenney | d9a3da0 | 2009-12-02 12:10:15 -0800 | [diff] [blame] | 454 | .stats = NULL, |
| 455 | .irq_capable = 1, |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 456 | .can_boost = rcu_can_boost(), |
Paul E. McKenney | d9a3da0 | 2009-12-02 12:10:15 -0800 | [diff] [blame] | 457 | .name = "rcu_expedited" |
| 458 | }; |
| 459 | |
Paul E. McKenney | c32e066 | 2006-06-27 02:54:04 -0700 | [diff] [blame] | 460 | /* |
| 461 | * Definitions for rcu_bh torture testing. |
| 462 | */ |
| 463 | |
Josh Triplett | a49a4af | 2006-09-29 01:59:30 -0700 | [diff] [blame] | 464 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
Paul E. McKenney | c32e066 | 2006-06-27 02:54:04 -0700 | [diff] [blame] | 465 | { |
| 466 | rcu_read_lock_bh(); |
| 467 | return 0; |
| 468 | } |
| 469 | |
Josh Triplett | a49a4af | 2006-09-29 01:59:30 -0700 | [diff] [blame] | 470 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
Paul E. McKenney | c32e066 | 2006-06-27 02:54:04 -0700 | [diff] [blame] | 471 | { |
| 472 | rcu_read_unlock_bh(); |
| 473 | } |
| 474 | |
| 475 | static int rcu_bh_torture_completed(void) |
| 476 | { |
| 477 | return rcu_batches_completed_bh(); |
| 478 | } |
| 479 | |
| 480 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) |
| 481 | { |
| 482 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); |
| 483 | } |
| 484 | |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 485 | struct rcu_bh_torture_synchronize { |
| 486 | struct rcu_head head; |
| 487 | struct completion completion; |
| 488 | }; |
| 489 | |
| 490 | static void rcu_bh_torture_wakeme_after_cb(struct rcu_head *head) |
| 491 | { |
| 492 | struct rcu_bh_torture_synchronize *rcu; |
| 493 | |
| 494 | rcu = container_of(head, struct rcu_bh_torture_synchronize, head); |
| 495 | complete(&rcu->completion); |
| 496 | } |
| 497 | |
| 498 | static void rcu_bh_torture_synchronize(void) |
| 499 | { |
| 500 | struct rcu_bh_torture_synchronize rcu; |
| 501 | |
Paul E. McKenney | 72d5a9f | 2010-05-10 17:12:17 -0700 | [diff] [blame] | 502 | init_rcu_head_on_stack(&rcu.head); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 503 | init_completion(&rcu.completion); |
| 504 | call_rcu_bh(&rcu.head, rcu_bh_torture_wakeme_after_cb); |
| 505 | wait_for_completion(&rcu.completion); |
Paul E. McKenney | 72d5a9f | 2010-05-10 17:12:17 -0700 | [diff] [blame] | 506 | destroy_rcu_head_on_stack(&rcu.head); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 507 | } |
| 508 | |
Paul E. McKenney | c32e066 | 2006-06-27 02:54:04 -0700 | [diff] [blame] | 509 | static struct rcu_torture_ops rcu_bh_ops = { |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 510 | .init = NULL, |
| 511 | .cleanup = NULL, |
| 512 | .readlock = rcu_bh_torture_read_lock, |
| 513 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ |
| 514 | .readunlock = rcu_bh_torture_read_unlock, |
| 515 | .completed = rcu_bh_torture_completed, |
| 516 | .deferred_free = rcu_bh_torture_deferred_free, |
| 517 | .sync = rcu_bh_torture_synchronize, |
| 518 | .cb_barrier = rcu_barrier_bh, |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 519 | .fqs = rcu_bh_force_quiescent_state, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 520 | .stats = NULL, |
| 521 | .irq_capable = 1, |
| 522 | .name = "rcu_bh" |
Paul E. McKenney | c32e066 | 2006-06-27 02:54:04 -0700 | [diff] [blame] | 523 | }; |
| 524 | |
Josh Triplett | 11a1470 | 2006-10-04 02:17:16 -0700 | [diff] [blame] | 525 | static struct rcu_torture_ops rcu_bh_sync_ops = { |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 526 | .init = rcu_sync_torture_init, |
| 527 | .cleanup = NULL, |
| 528 | .readlock = rcu_bh_torture_read_lock, |
| 529 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ |
| 530 | .readunlock = rcu_bh_torture_read_unlock, |
| 531 | .completed = rcu_bh_torture_completed, |
| 532 | .deferred_free = rcu_sync_torture_deferred_free, |
| 533 | .sync = rcu_bh_torture_synchronize, |
| 534 | .cb_barrier = NULL, |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 535 | .fqs = rcu_bh_force_quiescent_state, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 536 | .stats = NULL, |
| 537 | .irq_capable = 1, |
| 538 | .name = "rcu_bh_sync" |
Josh Triplett | 11a1470 | 2006-10-04 02:17:16 -0700 | [diff] [blame] | 539 | }; |
| 540 | |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 541 | /* |
| 542 | * Definitions for srcu torture testing. |
| 543 | */ |
| 544 | |
| 545 | static struct srcu_struct srcu_ctl; |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 546 | |
| 547 | static void srcu_torture_init(void) |
| 548 | { |
| 549 | init_srcu_struct(&srcu_ctl); |
Josh Triplett | e303373 | 2006-10-04 02:17:14 -0700 | [diff] [blame] | 550 | rcu_sync_torture_init(); |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | static void srcu_torture_cleanup(void) |
| 554 | { |
| 555 | synchronize_srcu(&srcu_ctl); |
| 556 | cleanup_srcu_struct(&srcu_ctl); |
| 557 | } |
| 558 | |
Josh Triplett | 012d3ca | 2006-12-06 20:40:19 -0800 | [diff] [blame] | 559 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 560 | { |
| 561 | return srcu_read_lock(&srcu_ctl); |
| 562 | } |
| 563 | |
| 564 | static void srcu_read_delay(struct rcu_random_state *rrsp) |
| 565 | { |
| 566 | long delay; |
| 567 | const long uspertick = 1000000 / HZ; |
| 568 | const long longdelay = 10; |
| 569 | |
| 570 | /* We want there to be long-running readers, but not all the time. */ |
| 571 | |
| 572 | delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick); |
| 573 | if (!delay) |
| 574 | schedule_timeout_interruptible(longdelay); |
Lai Jiangshan | e546f48 | 2010-06-21 16:57:42 +0800 | [diff] [blame] | 575 | else |
| 576 | rcu_read_delay(rrsp); |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 577 | } |
| 578 | |
Josh Triplett | 012d3ca | 2006-12-06 20:40:19 -0800 | [diff] [blame] | 579 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 580 | { |
| 581 | srcu_read_unlock(&srcu_ctl, idx); |
| 582 | } |
| 583 | |
| 584 | static int srcu_torture_completed(void) |
| 585 | { |
| 586 | return srcu_batches_completed(&srcu_ctl); |
| 587 | } |
| 588 | |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 589 | static void srcu_torture_synchronize(void) |
| 590 | { |
| 591 | synchronize_srcu(&srcu_ctl); |
| 592 | } |
| 593 | |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 594 | static int srcu_torture_stats(char *page) |
| 595 | { |
| 596 | int cnt = 0; |
| 597 | int cpu; |
| 598 | int idx = srcu_ctl.completed & 0x1; |
| 599 | |
| 600 | cnt += sprintf(&page[cnt], "%s%s per-CPU(idx=%d):", |
| 601 | torture_type, TORTURE_FLAG, idx); |
| 602 | for_each_possible_cpu(cpu) { |
| 603 | cnt += sprintf(&page[cnt], " %d(%d,%d)", cpu, |
| 604 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], |
| 605 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); |
| 606 | } |
| 607 | cnt += sprintf(&page[cnt], "\n"); |
| 608 | return cnt; |
| 609 | } |
| 610 | |
| 611 | static struct rcu_torture_ops srcu_ops = { |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 612 | .init = srcu_torture_init, |
| 613 | .cleanup = srcu_torture_cleanup, |
| 614 | .readlock = srcu_torture_read_lock, |
| 615 | .read_delay = srcu_read_delay, |
| 616 | .readunlock = srcu_torture_read_unlock, |
| 617 | .completed = srcu_torture_completed, |
| 618 | .deferred_free = rcu_sync_torture_deferred_free, |
| 619 | .sync = srcu_torture_synchronize, |
| 620 | .cb_barrier = NULL, |
| 621 | .stats = srcu_torture_stats, |
| 622 | .name = "srcu" |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 623 | }; |
| 624 | |
Paul E. McKenney | 804bb83 | 2009-10-25 19:03:52 -0700 | [diff] [blame] | 625 | static void srcu_torture_synchronize_expedited(void) |
| 626 | { |
| 627 | synchronize_srcu_expedited(&srcu_ctl); |
| 628 | } |
| 629 | |
| 630 | static struct rcu_torture_ops srcu_expedited_ops = { |
| 631 | .init = srcu_torture_init, |
| 632 | .cleanup = srcu_torture_cleanup, |
| 633 | .readlock = srcu_torture_read_lock, |
| 634 | .read_delay = srcu_read_delay, |
| 635 | .readunlock = srcu_torture_read_unlock, |
| 636 | .completed = srcu_torture_completed, |
| 637 | .deferred_free = rcu_sync_torture_deferred_free, |
| 638 | .sync = srcu_torture_synchronize_expedited, |
| 639 | .cb_barrier = NULL, |
| 640 | .stats = srcu_torture_stats, |
| 641 | .name = "srcu_expedited" |
| 642 | }; |
| 643 | |
Josh Triplett | 4b6c2cc | 2006-10-04 02:17:16 -0700 | [diff] [blame] | 644 | /* |
| 645 | * Definitions for sched torture testing. |
| 646 | */ |
| 647 | |
| 648 | static int sched_torture_read_lock(void) |
| 649 | { |
| 650 | preempt_disable(); |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | static void sched_torture_read_unlock(int idx) |
| 655 | { |
| 656 | preempt_enable(); |
| 657 | } |
| 658 | |
Paul E. McKenney | 2326974 | 2008-05-12 21:21:05 +0200 | [diff] [blame] | 659 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
| 660 | { |
| 661 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); |
| 662 | } |
| 663 | |
Josh Triplett | 4b6c2cc | 2006-10-04 02:17:16 -0700 | [diff] [blame] | 664 | static void sched_torture_synchronize(void) |
| 665 | { |
| 666 | synchronize_sched(); |
| 667 | } |
| 668 | |
| 669 | static struct rcu_torture_ops sched_ops = { |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 670 | .init = rcu_sync_torture_init, |
| 671 | .cleanup = NULL, |
| 672 | .readlock = sched_torture_read_lock, |
| 673 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ |
| 674 | .readunlock = sched_torture_read_unlock, |
Paul E. McKenney | d9a3da0 | 2009-12-02 12:10:15 -0800 | [diff] [blame] | 675 | .completed = rcu_no_completed, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 676 | .deferred_free = rcu_sched_torture_deferred_free, |
| 677 | .sync = sched_torture_synchronize, |
| 678 | .cb_barrier = rcu_barrier_sched, |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 679 | .fqs = rcu_sched_force_quiescent_state, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 680 | .stats = NULL, |
| 681 | .irq_capable = 1, |
| 682 | .name = "sched" |
Josh Triplett | 4b6c2cc | 2006-10-04 02:17:16 -0700 | [diff] [blame] | 683 | }; |
| 684 | |
Paul E. McKenney | 804bb83 | 2009-10-25 19:03:52 -0700 | [diff] [blame] | 685 | static struct rcu_torture_ops sched_sync_ops = { |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 686 | .init = rcu_sync_torture_init, |
| 687 | .cleanup = NULL, |
| 688 | .readlock = sched_torture_read_lock, |
| 689 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ |
| 690 | .readunlock = sched_torture_read_unlock, |
Paul E. McKenney | d9a3da0 | 2009-12-02 12:10:15 -0800 | [diff] [blame] | 691 | .completed = rcu_no_completed, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 692 | .deferred_free = rcu_sync_torture_deferred_free, |
| 693 | .sync = sched_torture_synchronize, |
| 694 | .cb_barrier = NULL, |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 695 | .fqs = rcu_sched_force_quiescent_state, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 696 | .stats = NULL, |
| 697 | .name = "sched_sync" |
| 698 | }; |
| 699 | |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 700 | static struct rcu_torture_ops sched_expedited_ops = { |
| 701 | .init = rcu_sync_torture_init, |
| 702 | .cleanup = NULL, |
| 703 | .readlock = sched_torture_read_lock, |
| 704 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ |
| 705 | .readunlock = sched_torture_read_unlock, |
Paul E. McKenney | d9a3da0 | 2009-12-02 12:10:15 -0800 | [diff] [blame] | 706 | .completed = rcu_no_completed, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 707 | .deferred_free = rcu_sync_torture_deferred_free, |
| 708 | .sync = synchronize_sched_expedited, |
| 709 | .cb_barrier = NULL, |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 710 | .fqs = rcu_sched_force_quiescent_state, |
Tejun Heo | 969c792 | 2010-05-06 18:49:21 +0200 | [diff] [blame] | 711 | .stats = NULL, |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 712 | .irq_capable = 1, |
| 713 | .name = "sched_expedited" |
Paul E. McKenney | 2326974 | 2008-05-12 21:21:05 +0200 | [diff] [blame] | 714 | }; |
| 715 | |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 716 | /* |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 717 | * RCU torture priority-boost testing. Runs one real-time thread per |
| 718 | * CPU for moderate bursts, repeatedly registering RCU callbacks and |
| 719 | * spinning waiting for them to be invoked. If a given callback takes |
| 720 | * too long to be invoked, we assume that priority inversion has occurred. |
| 721 | */ |
| 722 | |
| 723 | struct rcu_boost_inflight { |
| 724 | struct rcu_head rcu; |
| 725 | int inflight; |
| 726 | }; |
| 727 | |
| 728 | static void rcu_torture_boost_cb(struct rcu_head *head) |
| 729 | { |
| 730 | struct rcu_boost_inflight *rbip = |
| 731 | container_of(head, struct rcu_boost_inflight, rcu); |
| 732 | |
| 733 | smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ |
| 734 | rbip->inflight = 0; |
| 735 | } |
| 736 | |
| 737 | static int rcu_torture_boost(void *arg) |
| 738 | { |
| 739 | unsigned long call_rcu_time; |
| 740 | unsigned long endtime; |
| 741 | unsigned long oldstarttime; |
| 742 | struct rcu_boost_inflight rbi = { .inflight = 0 }; |
| 743 | struct sched_param sp; |
| 744 | |
| 745 | VERBOSE_PRINTK_STRING("rcu_torture_boost started"); |
| 746 | |
| 747 | /* Set real-time priority. */ |
| 748 | sp.sched_priority = 1; |
| 749 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { |
| 750 | VERBOSE_PRINTK_STRING("rcu_torture_boost RT prio failed!"); |
| 751 | n_rcu_torture_boost_rterror++; |
| 752 | } |
| 753 | |
| 754 | /* Each pass through the following loop does one boost-test cycle. */ |
| 755 | do { |
| 756 | /* Wait for the next test interval. */ |
| 757 | oldstarttime = boost_starttime; |
| 758 | while (jiffies - oldstarttime > ULONG_MAX / 2) { |
| 759 | schedule_timeout_uninterruptible(1); |
| 760 | rcu_stutter_wait("rcu_torture_boost"); |
| 761 | if (kthread_should_stop() || |
| 762 | fullstop != FULLSTOP_DONTSTOP) |
| 763 | goto checkwait; |
| 764 | } |
| 765 | |
| 766 | /* Do one boost-test interval. */ |
| 767 | endtime = oldstarttime + test_boost_duration * HZ; |
| 768 | call_rcu_time = jiffies; |
| 769 | while (jiffies - endtime > ULONG_MAX / 2) { |
| 770 | /* If we don't have a callback in flight, post one. */ |
| 771 | if (!rbi.inflight) { |
| 772 | smp_mb(); /* RCU core before ->inflight = 1. */ |
| 773 | rbi.inflight = 1; |
| 774 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); |
| 775 | if (jiffies - call_rcu_time > |
| 776 | test_boost_duration * HZ - HZ / 2) { |
| 777 | VERBOSE_PRINTK_STRING("rcu_torture_boost boosting failed"); |
| 778 | n_rcu_torture_boost_failure++; |
| 779 | } |
| 780 | call_rcu_time = jiffies; |
| 781 | } |
| 782 | cond_resched(); |
| 783 | rcu_stutter_wait("rcu_torture_boost"); |
| 784 | if (kthread_should_stop() || |
| 785 | fullstop != FULLSTOP_DONTSTOP) |
| 786 | goto checkwait; |
| 787 | } |
| 788 | |
| 789 | /* |
| 790 | * Set the start time of the next test interval. |
| 791 | * Yes, this is vulnerable to long delays, but such |
| 792 | * delays simply cause a false negative for the next |
| 793 | * interval. Besides, we are running at RT priority, |
| 794 | * so delays should be relatively rare. |
| 795 | */ |
| 796 | while (oldstarttime == boost_starttime) { |
| 797 | if (mutex_trylock(&boost_mutex)) { |
| 798 | boost_starttime = jiffies + |
| 799 | test_boost_interval * HZ; |
| 800 | n_rcu_torture_boosts++; |
| 801 | mutex_unlock(&boost_mutex); |
| 802 | break; |
| 803 | } |
| 804 | schedule_timeout_uninterruptible(1); |
| 805 | } |
| 806 | |
| 807 | /* Go do the stutter. */ |
| 808 | checkwait: rcu_stutter_wait("rcu_torture_boost"); |
| 809 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
| 810 | |
| 811 | /* Clean up and exit. */ |
| 812 | VERBOSE_PRINTK_STRING("rcu_torture_boost task stopping"); |
| 813 | rcutorture_shutdown_absorb("rcu_torture_boost"); |
| 814 | while (!kthread_should_stop() || rbi.inflight) |
| 815 | schedule_timeout_uninterruptible(1); |
| 816 | smp_mb(); /* order accesses to ->inflight before stack-frame death. */ |
| 817 | return 0; |
| 818 | } |
| 819 | |
| 820 | /* |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 821 | * RCU torture force-quiescent-state kthread. Repeatedly induces |
| 822 | * bursts of calls to force_quiescent_state(), increasing the probability |
| 823 | * of occurrence of some important types of race conditions. |
| 824 | */ |
| 825 | static int |
| 826 | rcu_torture_fqs(void *arg) |
| 827 | { |
| 828 | unsigned long fqs_resume_time; |
| 829 | int fqs_burst_remaining; |
| 830 | |
| 831 | VERBOSE_PRINTK_STRING("rcu_torture_fqs task started"); |
| 832 | do { |
| 833 | fqs_resume_time = jiffies + fqs_stutter * HZ; |
| 834 | while (jiffies - fqs_resume_time > LONG_MAX) { |
| 835 | schedule_timeout_interruptible(1); |
| 836 | } |
| 837 | fqs_burst_remaining = fqs_duration; |
| 838 | while (fqs_burst_remaining > 0) { |
| 839 | cur_ops->fqs(); |
| 840 | udelay(fqs_holdoff); |
| 841 | fqs_burst_remaining -= fqs_holdoff; |
| 842 | } |
| 843 | rcu_stutter_wait("rcu_torture_fqs"); |
| 844 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
| 845 | VERBOSE_PRINTK_STRING("rcu_torture_fqs task stopping"); |
| 846 | rcutorture_shutdown_absorb("rcu_torture_fqs"); |
| 847 | while (!kthread_should_stop()) |
| 848 | schedule_timeout_uninterruptible(1); |
| 849 | return 0; |
| 850 | } |
| 851 | |
| 852 | /* |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 853 | * RCU torture writer kthread. Repeatedly substitutes a new structure |
| 854 | * for that pointed to by rcu_torture_current, freeing the old structure |
| 855 | * after a series of grace periods (the "pipeline"). |
| 856 | */ |
| 857 | static int |
| 858 | rcu_torture_writer(void *arg) |
| 859 | { |
| 860 | int i; |
| 861 | long oldbatch = rcu_batches_completed(); |
| 862 | struct rcu_torture *rp; |
| 863 | struct rcu_torture *old_rp; |
| 864 | static DEFINE_RCU_RANDOM(rand); |
| 865 | |
| 866 | VERBOSE_PRINTK_STRING("rcu_torture_writer task started"); |
Ingo Molnar | dbdf65b | 2005-11-13 16:07:22 -0800 | [diff] [blame] | 867 | set_user_nice(current, 19); |
| 868 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 869 | do { |
| 870 | schedule_timeout_uninterruptible(1); |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 871 | rp = rcu_torture_alloc(); |
| 872 | if (rp == NULL) |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 873 | continue; |
| 874 | rp->rtort_pipe_count = 0; |
| 875 | udelay(rcu_random(&rand) & 0x3ff); |
Paul E. McKenney | 0ddea0e | 2010-09-19 21:06:14 -0700 | [diff] [blame] | 876 | old_rp = rcu_dereference_check(rcu_torture_current, |
| 877 | current == writer_task); |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 878 | rp->rtort_mbtest = 1; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 879 | rcu_assign_pointer(rcu_torture_current, rp); |
Paul E. McKenney | 9b2619a | 2009-09-23 09:50:43 -0700 | [diff] [blame] | 880 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 881 | if (old_rp) { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 882 | i = old_rp->rtort_pipe_count; |
| 883 | if (i > RCU_TORTURE_PIPE_LEN) |
| 884 | i = RCU_TORTURE_PIPE_LEN; |
| 885 | atomic_inc(&rcu_torture_wcount[i]); |
| 886 | old_rp->rtort_pipe_count++; |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 887 | cur_ops->deferred_free(old_rp); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 888 | } |
| 889 | rcu_torture_current_version++; |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 890 | oldbatch = cur_ops->completed(); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 891 | rcu_stutter_wait("rcu_torture_writer"); |
| 892 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 893 | VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 894 | rcutorture_shutdown_absorb("rcu_torture_writer"); |
| 895 | while (!kthread_should_stop()) |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 896 | schedule_timeout_uninterruptible(1); |
| 897 | return 0; |
| 898 | } |
| 899 | |
| 900 | /* |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 901 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random |
| 902 | * delay between calls. |
| 903 | */ |
| 904 | static int |
| 905 | rcu_torture_fakewriter(void *arg) |
| 906 | { |
| 907 | DEFINE_RCU_RANDOM(rand); |
| 908 | |
| 909 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); |
| 910 | set_user_nice(current, 19); |
| 911 | |
| 912 | do { |
| 913 | schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); |
| 914 | udelay(rcu_random(&rand) & 0x3ff); |
| 915 | cur_ops->sync(); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 916 | rcu_stutter_wait("rcu_torture_fakewriter"); |
| 917 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 918 | |
| 919 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 920 | rcutorture_shutdown_absorb("rcu_torture_fakewriter"); |
| 921 | while (!kthread_should_stop()) |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 922 | schedule_timeout_uninterruptible(1); |
| 923 | return 0; |
| 924 | } |
| 925 | |
| 926 | /* |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 927 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, |
| 928 | * incrementing the corresponding element of the pipeline array. The |
| 929 | * counter in the element should never be greater than 1, otherwise, the |
| 930 | * RCU implementation is broken. |
| 931 | */ |
| 932 | static void rcu_torture_timer(unsigned long unused) |
| 933 | { |
| 934 | int idx; |
| 935 | int completed; |
| 936 | static DEFINE_RCU_RANDOM(rand); |
| 937 | static DEFINE_SPINLOCK(rand_lock); |
| 938 | struct rcu_torture *p; |
| 939 | int pipe_count; |
| 940 | |
| 941 | idx = cur_ops->readlock(); |
| 942 | completed = cur_ops->completed(); |
Paul E. McKenney | 632ee20 | 2010-02-22 17:04:45 -0800 | [diff] [blame] | 943 | p = rcu_dereference_check(rcu_torture_current, |
| 944 | rcu_read_lock_held() || |
| 945 | rcu_read_lock_bh_held() || |
| 946 | rcu_read_lock_sched_held() || |
| 947 | srcu_read_lock_held(&srcu_ctl)); |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 948 | if (p == NULL) { |
| 949 | /* Leave because rcu_torture_writer is not yet underway */ |
| 950 | cur_ops->readunlock(idx); |
| 951 | return; |
| 952 | } |
| 953 | if (p->rtort_mbtest == 0) |
| 954 | atomic_inc(&n_rcu_torture_mberror); |
| 955 | spin_lock(&rand_lock); |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 956 | cur_ops->read_delay(&rand); |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 957 | n_rcu_torture_timers++; |
| 958 | spin_unlock(&rand_lock); |
| 959 | preempt_disable(); |
| 960 | pipe_count = p->rtort_pipe_count; |
| 961 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { |
| 962 | /* Should not happen, but... */ |
| 963 | pipe_count = RCU_TORTURE_PIPE_LEN; |
| 964 | } |
Rusty Russell | dd17c8f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 965 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 966 | completed = cur_ops->completed() - completed; |
| 967 | if (completed > RCU_TORTURE_PIPE_LEN) { |
| 968 | /* Should not happen, but... */ |
| 969 | completed = RCU_TORTURE_PIPE_LEN; |
| 970 | } |
Rusty Russell | dd17c8f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 971 | __this_cpu_inc(rcu_torture_batch[completed]); |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 972 | preempt_enable(); |
| 973 | cur_ops->readunlock(idx); |
| 974 | } |
| 975 | |
| 976 | /* |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 977 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, |
| 978 | * incrementing the corresponding element of the pipeline array. The |
| 979 | * counter in the element should never be greater than 1, otherwise, the |
| 980 | * RCU implementation is broken. |
| 981 | */ |
| 982 | static int |
| 983 | rcu_torture_reader(void *arg) |
| 984 | { |
| 985 | int completed; |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 986 | int idx; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 987 | DEFINE_RCU_RANDOM(rand); |
| 988 | struct rcu_torture *p; |
| 989 | int pipe_count; |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 990 | struct timer_list t; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 991 | |
| 992 | VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); |
Ingo Molnar | dbdf65b | 2005-11-13 16:07:22 -0800 | [diff] [blame] | 993 | set_user_nice(current, 19); |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 994 | if (irqreader && cur_ops->irq_capable) |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 995 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
Ingo Molnar | dbdf65b | 2005-11-13 16:07:22 -0800 | [diff] [blame] | 996 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 997 | do { |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 998 | if (irqreader && cur_ops->irq_capable) { |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 999 | if (!timer_pending(&t)) |
Paul E. McKenney | 6155fec | 2010-02-22 17:05:04 -0800 | [diff] [blame] | 1000 | mod_timer(&t, jiffies + 1); |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 1001 | } |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1002 | idx = cur_ops->readlock(); |
| 1003 | completed = cur_ops->completed(); |
Paul E. McKenney | 632ee20 | 2010-02-22 17:04:45 -0800 | [diff] [blame] | 1004 | p = rcu_dereference_check(rcu_torture_current, |
| 1005 | rcu_read_lock_held() || |
| 1006 | rcu_read_lock_bh_held() || |
| 1007 | rcu_read_lock_sched_held() || |
| 1008 | srcu_read_lock_held(&srcu_ctl)); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1009 | if (p == NULL) { |
| 1010 | /* Wait for rcu_torture_writer to get underway */ |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1011 | cur_ops->readunlock(idx); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1012 | schedule_timeout_interruptible(HZ); |
| 1013 | continue; |
| 1014 | } |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1015 | if (p->rtort_mbtest == 0) |
| 1016 | atomic_inc(&n_rcu_torture_mberror); |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 1017 | cur_ops->read_delay(&rand); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1018 | preempt_disable(); |
| 1019 | pipe_count = p->rtort_pipe_count; |
| 1020 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { |
| 1021 | /* Should not happen, but... */ |
| 1022 | pipe_count = RCU_TORTURE_PIPE_LEN; |
| 1023 | } |
Rusty Russell | dd17c8f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 1024 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1025 | completed = cur_ops->completed() - completed; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1026 | if (completed > RCU_TORTURE_PIPE_LEN) { |
| 1027 | /* Should not happen, but... */ |
| 1028 | completed = RCU_TORTURE_PIPE_LEN; |
| 1029 | } |
Rusty Russell | dd17c8f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 1030 | __this_cpu_inc(rcu_torture_batch[completed]); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1031 | preempt_enable(); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1032 | cur_ops->readunlock(idx); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1033 | schedule(); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1034 | rcu_stutter_wait("rcu_torture_reader"); |
| 1035 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1036 | VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1037 | rcutorture_shutdown_absorb("rcu_torture_reader"); |
Paul E. McKenney | 0acc512 | 2009-06-25 09:08:17 -0700 | [diff] [blame] | 1038 | if (irqreader && cur_ops->irq_capable) |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 1039 | del_timer_sync(&t); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1040 | while (!kthread_should_stop()) |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1041 | schedule_timeout_uninterruptible(1); |
| 1042 | return 0; |
| 1043 | } |
| 1044 | |
| 1045 | /* |
| 1046 | * Create an RCU-torture statistics message in the specified buffer. |
| 1047 | */ |
| 1048 | static int |
| 1049 | rcu_torture_printk(char *page) |
| 1050 | { |
| 1051 | int cnt = 0; |
| 1052 | int cpu; |
| 1053 | int i; |
| 1054 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; |
| 1055 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; |
| 1056 | |
KAMEZAWA Hiroyuki | 0a94502 | 2006-03-28 01:56:37 -0800 | [diff] [blame] | 1057 | for_each_possible_cpu(cpu) { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1058 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
| 1059 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; |
| 1060 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; |
| 1061 | } |
| 1062 | } |
| 1063 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { |
| 1064 | if (pipesummary[i] != 0) |
| 1065 | break; |
| 1066 | } |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1067 | cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1068 | cnt += sprintf(&page[cnt], |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1069 | "rtc: %p ver: %ld tfle: %d rta: %d rtaf: %d rtf: %d " |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1070 | "rtmbe: %d rtbke: %ld rtbre: %ld rtbae: %ld rtbafe: %ld " |
| 1071 | "rtbf: %ld rtb: %ld nt: %ld", |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1072 | rcu_torture_current, |
| 1073 | rcu_torture_current_version, |
| 1074 | list_empty(&rcu_torture_freelist), |
| 1075 | atomic_read(&n_rcu_torture_alloc), |
| 1076 | atomic_read(&n_rcu_torture_alloc_fail), |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1077 | atomic_read(&n_rcu_torture_free), |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 1078 | atomic_read(&n_rcu_torture_mberror), |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1079 | n_rcu_torture_boost_ktrerror, |
| 1080 | n_rcu_torture_boost_rterror, |
| 1081 | n_rcu_torture_boost_allocerror, |
| 1082 | n_rcu_torture_boost_afferror, |
| 1083 | n_rcu_torture_boost_failure, |
| 1084 | n_rcu_torture_boosts, |
Paul E. McKenney | 0729fbf | 2008-06-25 12:24:52 -0700 | [diff] [blame] | 1085 | n_rcu_torture_timers); |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1086 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
| 1087 | n_rcu_torture_boost_ktrerror != 0 || |
| 1088 | n_rcu_torture_boost_rterror != 0 || |
| 1089 | n_rcu_torture_boost_allocerror != 0 || |
| 1090 | n_rcu_torture_boost_afferror != 0 || |
| 1091 | n_rcu_torture_boost_failure != 0) |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1092 | cnt += sprintf(&page[cnt], " !!!"); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1093 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1094 | if (i > 1) { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1095 | cnt += sprintf(&page[cnt], "!!! "); |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1096 | atomic_inc(&n_rcu_torture_error); |
Ingo Molnar | 5af970a | 2008-06-18 10:09:48 +0200 | [diff] [blame] | 1097 | WARN_ON_ONCE(1); |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1098 | } |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1099 | cnt += sprintf(&page[cnt], "Reader Pipe: "); |
| 1100 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
| 1101 | cnt += sprintf(&page[cnt], " %ld", pipesummary[i]); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1102 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1103 | cnt += sprintf(&page[cnt], "Reader Batch: "); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1104 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1105 | cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1106 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1107 | cnt += sprintf(&page[cnt], "Free-Block Circulation: "); |
| 1108 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
| 1109 | cnt += sprintf(&page[cnt], " %d", |
| 1110 | atomic_read(&rcu_torture_wcount[i])); |
| 1111 | } |
| 1112 | cnt += sprintf(&page[cnt], "\n"); |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1113 | if (cur_ops->stats) |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1114 | cnt += cur_ops->stats(&page[cnt]); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1115 | return cnt; |
| 1116 | } |
| 1117 | |
| 1118 | /* |
| 1119 | * Print torture statistics. Caller must ensure that there is only |
| 1120 | * one call to this function at a given time!!! This is normally |
| 1121 | * accomplished by relying on the module system to only have one copy |
| 1122 | * of the module loaded, and then by giving the rcu_torture_stats |
| 1123 | * kthread full control (or the init/cleanup functions when rcu_torture_stats |
| 1124 | * thread is not running). |
| 1125 | */ |
| 1126 | static void |
| 1127 | rcu_torture_stats_print(void) |
| 1128 | { |
| 1129 | int cnt; |
| 1130 | |
| 1131 | cnt = rcu_torture_printk(printk_buf); |
| 1132 | printk(KERN_ALERT "%s", printk_buf); |
| 1133 | } |
| 1134 | |
| 1135 | /* |
| 1136 | * Periodically prints torture statistics, if periodic statistics printing |
| 1137 | * was specified via the stat_interval module parameter. |
| 1138 | * |
| 1139 | * No need to worry about fullstop here, since this one doesn't reference |
| 1140 | * volatile state or register callbacks. |
| 1141 | */ |
| 1142 | static int |
| 1143 | rcu_torture_stats(void *arg) |
| 1144 | { |
| 1145 | VERBOSE_PRINTK_STRING("rcu_torture_stats task started"); |
| 1146 | do { |
| 1147 | schedule_timeout_interruptible(stat_interval * HZ); |
| 1148 | rcu_torture_stats_print(); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1149 | rcutorture_shutdown_absorb("rcu_torture_stats"); |
| 1150 | } while (!kthread_should_stop()); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1151 | VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); |
| 1152 | return 0; |
| 1153 | } |
| 1154 | |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1155 | static int rcu_idle_cpu; /* Force all torture tasks off this CPU */ |
| 1156 | |
| 1157 | /* Shuffle tasks such that we allow @rcu_idle_cpu to become idle. A special case |
| 1158 | * is when @rcu_idle_cpu = -1, when we allow the tasks to run on all CPUs. |
| 1159 | */ |
Paul E. McKenney | b2896d2 | 2006-10-04 02:17:03 -0700 | [diff] [blame] | 1160 | static void rcu_torture_shuffle_tasks(void) |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1161 | { |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1162 | int i; |
| 1163 | |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1164 | cpumask_setall(shuffle_tmp_mask); |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 1165 | get_online_cpus(); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1166 | |
| 1167 | /* No point in shuffling if there is only one online CPU (ex: UP) */ |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1168 | if (num_online_cpus() == 1) { |
| 1169 | put_online_cpus(); |
| 1170 | return; |
| 1171 | } |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1172 | |
| 1173 | if (rcu_idle_cpu != -1) |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1174 | cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1175 | |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1176 | set_cpus_allowed_ptr(current, shuffle_tmp_mask); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1177 | |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1178 | if (reader_tasks) { |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1179 | for (i = 0; i < nrealreaders; i++) |
| 1180 | if (reader_tasks[i]) |
Mike Travis | f70316d | 2008-04-04 18:11:06 -0700 | [diff] [blame] | 1181 | set_cpus_allowed_ptr(reader_tasks[i], |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1182 | shuffle_tmp_mask); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1183 | } |
| 1184 | |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1185 | if (fakewriter_tasks) { |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1186 | for (i = 0; i < nfakewriters; i++) |
| 1187 | if (fakewriter_tasks[i]) |
Mike Travis | f70316d | 2008-04-04 18:11:06 -0700 | [diff] [blame] | 1188 | set_cpus_allowed_ptr(fakewriter_tasks[i], |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1189 | shuffle_tmp_mask); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1190 | } |
| 1191 | |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1192 | if (writer_task) |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1193 | set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1194 | |
| 1195 | if (stats_task) |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1196 | set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1197 | |
| 1198 | if (rcu_idle_cpu == -1) |
| 1199 | rcu_idle_cpu = num_online_cpus() - 1; |
| 1200 | else |
| 1201 | rcu_idle_cpu--; |
| 1202 | |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 1203 | put_online_cpus(); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1204 | } |
| 1205 | |
| 1206 | /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the |
| 1207 | * system to become idle at a time and cut off its timer ticks. This is meant |
| 1208 | * to test the support for such tickless idle CPU in RCU. |
| 1209 | */ |
| 1210 | static int |
| 1211 | rcu_torture_shuffle(void *arg) |
| 1212 | { |
| 1213 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task started"); |
| 1214 | do { |
| 1215 | schedule_timeout_interruptible(shuffle_interval * HZ); |
| 1216 | rcu_torture_shuffle_tasks(); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1217 | rcutorture_shutdown_absorb("rcu_torture_shuffle"); |
| 1218 | } while (!kthread_should_stop()); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1219 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); |
| 1220 | return 0; |
| 1221 | } |
| 1222 | |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 1223 | /* Cause the rcutorture test to "stutter", starting and stopping all |
| 1224 | * threads periodically. |
| 1225 | */ |
| 1226 | static int |
| 1227 | rcu_torture_stutter(void *arg) |
| 1228 | { |
| 1229 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task started"); |
| 1230 | do { |
| 1231 | schedule_timeout_interruptible(stutter * HZ); |
| 1232 | stutter_pause_test = 1; |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1233 | if (!kthread_should_stop()) |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 1234 | schedule_timeout_interruptible(stutter * HZ); |
| 1235 | stutter_pause_test = 0; |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1236 | rcutorture_shutdown_absorb("rcu_torture_stutter"); |
| 1237 | } while (!kthread_should_stop()); |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 1238 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); |
| 1239 | return 0; |
| 1240 | } |
| 1241 | |
Paul E. McKenney | 95c3832 | 2006-03-24 03:15:58 -0800 | [diff] [blame] | 1242 | static inline void |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1243 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, char *tag) |
Paul E. McKenney | 95c3832 | 2006-03-24 03:15:58 -0800 | [diff] [blame] | 1244 | { |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1245 | printk(KERN_ALERT "%s" TORTURE_FLAG |
| 1246 | "--- %s: nreaders=%d nfakewriters=%d " |
Paul E. McKenney | 95c3832 | 2006-03-24 03:15:58 -0800 | [diff] [blame] | 1247 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 1248 | "shuffle_interval=%d stutter=%d irqreader=%d " |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1249 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " |
| 1250 | "test_boost=%d/%d test_boost_interval=%d " |
| 1251 | "test_boost_duration=%d\n", |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1252 | torture_type, tag, nrealreaders, nfakewriters, |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 1253 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1254 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, |
| 1255 | test_boost, cur_ops->can_boost, |
| 1256 | test_boost_interval, test_boost_duration); |
Paul E. McKenney | 95c3832 | 2006-03-24 03:15:58 -0800 | [diff] [blame] | 1257 | } |
| 1258 | |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1259 | static struct notifier_block rcutorture_shutdown_nb = { |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1260 | .notifier_call = rcutorture_shutdown_notify, |
| 1261 | }; |
| 1262 | |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1263 | static void rcutorture_booster_cleanup(int cpu) |
| 1264 | { |
| 1265 | struct task_struct *t; |
| 1266 | |
| 1267 | if (boost_tasks[cpu] == NULL) |
| 1268 | return; |
| 1269 | mutex_lock(&boost_mutex); |
| 1270 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_boost task"); |
| 1271 | t = boost_tasks[cpu]; |
| 1272 | boost_tasks[cpu] = NULL; |
| 1273 | mutex_unlock(&boost_mutex); |
| 1274 | |
| 1275 | /* This must be outside of the mutex, otherwise deadlock! */ |
| 1276 | kthread_stop(t); |
| 1277 | } |
| 1278 | |
| 1279 | static int rcutorture_booster_init(int cpu) |
| 1280 | { |
| 1281 | int retval; |
| 1282 | |
| 1283 | if (boost_tasks[cpu] != NULL) |
| 1284 | return 0; /* Already created, nothing more to do. */ |
| 1285 | |
| 1286 | /* Don't allow time recalculation while creating a new task. */ |
| 1287 | mutex_lock(&boost_mutex); |
| 1288 | VERBOSE_PRINTK_STRING("Creating rcu_torture_boost task"); |
| 1289 | boost_tasks[cpu] = kthread_create(rcu_torture_boost, NULL, |
| 1290 | "rcu_torture_boost"); |
| 1291 | if (IS_ERR(boost_tasks[cpu])) { |
| 1292 | retval = PTR_ERR(boost_tasks[cpu]); |
| 1293 | VERBOSE_PRINTK_STRING("rcu_torture_boost task create failed"); |
| 1294 | n_rcu_torture_boost_ktrerror++; |
| 1295 | boost_tasks[cpu] = NULL; |
| 1296 | mutex_unlock(&boost_mutex); |
| 1297 | return retval; |
| 1298 | } |
| 1299 | kthread_bind(boost_tasks[cpu], cpu); |
| 1300 | wake_up_process(boost_tasks[cpu]); |
| 1301 | mutex_unlock(&boost_mutex); |
| 1302 | return 0; |
| 1303 | } |
| 1304 | |
| 1305 | static int rcutorture_cpu_notify(struct notifier_block *self, |
| 1306 | unsigned long action, void *hcpu) |
| 1307 | { |
| 1308 | long cpu = (long)hcpu; |
| 1309 | |
| 1310 | switch (action) { |
| 1311 | case CPU_ONLINE: |
| 1312 | case CPU_DOWN_FAILED: |
| 1313 | (void)rcutorture_booster_init(cpu); |
| 1314 | break; |
| 1315 | case CPU_DOWN_PREPARE: |
| 1316 | rcutorture_booster_cleanup(cpu); |
| 1317 | break; |
| 1318 | default: |
| 1319 | break; |
| 1320 | } |
| 1321 | return NOTIFY_OK; |
| 1322 | } |
| 1323 | |
| 1324 | static struct notifier_block rcutorture_cpu_nb = { |
| 1325 | .notifier_call = rcutorture_cpu_notify, |
| 1326 | }; |
| 1327 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1328 | static void |
| 1329 | rcu_torture_cleanup(void) |
| 1330 | { |
| 1331 | int i; |
| 1332 | |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1333 | mutex_lock(&fullstop_mutex); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1334 | if (fullstop == FULLSTOP_SHUTDOWN) { |
| 1335 | printk(KERN_WARNING /* but going down anyway, so... */ |
| 1336 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1337 | mutex_unlock(&fullstop_mutex); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1338 | schedule_timeout_uninterruptible(10); |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1339 | if (cur_ops->cb_barrier != NULL) |
| 1340 | cur_ops->cb_barrier(); |
| 1341 | return; |
| 1342 | } |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1343 | fullstop = FULLSTOP_RMMOD; |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1344 | mutex_unlock(&fullstop_mutex); |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1345 | unregister_reboot_notifier(&rcutorture_shutdown_nb); |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 1346 | if (stutter_task) { |
| 1347 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); |
| 1348 | kthread_stop(stutter_task); |
| 1349 | } |
| 1350 | stutter_task = NULL; |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1351 | if (shuffler_task) { |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1352 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); |
| 1353 | kthread_stop(shuffler_task); |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1354 | free_cpumask_var(shuffle_tmp_mask); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1355 | } |
| 1356 | shuffler_task = NULL; |
| 1357 | |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1358 | if (writer_task) { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1359 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); |
| 1360 | kthread_stop(writer_task); |
| 1361 | } |
| 1362 | writer_task = NULL; |
| 1363 | |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1364 | if (reader_tasks) { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1365 | for (i = 0; i < nrealreaders; i++) { |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1366 | if (reader_tasks[i]) { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1367 | VERBOSE_PRINTK_STRING( |
| 1368 | "Stopping rcu_torture_reader task"); |
| 1369 | kthread_stop(reader_tasks[i]); |
| 1370 | } |
| 1371 | reader_tasks[i] = NULL; |
| 1372 | } |
| 1373 | kfree(reader_tasks); |
| 1374 | reader_tasks = NULL; |
| 1375 | } |
| 1376 | rcu_torture_current = NULL; |
| 1377 | |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1378 | if (fakewriter_tasks) { |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1379 | for (i = 0; i < nfakewriters; i++) { |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1380 | if (fakewriter_tasks[i]) { |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1381 | VERBOSE_PRINTK_STRING( |
| 1382 | "Stopping rcu_torture_fakewriter task"); |
| 1383 | kthread_stop(fakewriter_tasks[i]); |
| 1384 | } |
| 1385 | fakewriter_tasks[i] = NULL; |
| 1386 | } |
| 1387 | kfree(fakewriter_tasks); |
| 1388 | fakewriter_tasks = NULL; |
| 1389 | } |
| 1390 | |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1391 | if (stats_task) { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1392 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); |
| 1393 | kthread_stop(stats_task); |
| 1394 | } |
| 1395 | stats_task = NULL; |
| 1396 | |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 1397 | if (fqs_task) { |
| 1398 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_fqs task"); |
| 1399 | kthread_stop(fqs_task); |
| 1400 | } |
| 1401 | fqs_task = NULL; |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1402 | if ((test_boost == 1 && cur_ops->can_boost) || |
| 1403 | test_boost == 2) { |
| 1404 | unregister_cpu_notifier(&rcutorture_cpu_nb); |
| 1405 | for_each_possible_cpu(i) |
| 1406 | rcutorture_booster_cleanup(i); |
| 1407 | } |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 1408 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1409 | /* Wait for all RCU callbacks to fire. */ |
Paul E. McKenney | 2326974 | 2008-05-12 21:21:05 +0200 | [diff] [blame] | 1410 | |
| 1411 | if (cur_ops->cb_barrier != NULL) |
| 1412 | cur_ops->cb_barrier(); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1413 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1414 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1415 | |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1416 | if (cur_ops->cleanup) |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1417 | cur_ops->cleanup(); |
Paul E. McKenney | 95c3832 | 2006-03-24 03:15:58 -0800 | [diff] [blame] | 1418 | if (atomic_read(&n_rcu_torture_error)) |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1419 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
Paul E. McKenney | 95c3832 | 2006-03-24 03:15:58 -0800 | [diff] [blame] | 1420 | else |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1421 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1422 | } |
| 1423 | |
Josh Triplett | 6f8bc50 | 2007-05-08 00:25:24 -0700 | [diff] [blame] | 1424 | static int __init |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1425 | rcu_torture_init(void) |
| 1426 | { |
| 1427 | int i; |
| 1428 | int cpu; |
| 1429 | int firsterr = 0; |
Josh Triplett | ade5fb8 | 2007-05-08 00:33:22 -0700 | [diff] [blame] | 1430 | static struct rcu_torture_ops *torture_ops[] = |
Paul E. McKenney | d9a3da0 | 2009-12-02 12:10:15 -0800 | [diff] [blame] | 1431 | { &rcu_ops, &rcu_sync_ops, &rcu_expedited_ops, |
| 1432 | &rcu_bh_ops, &rcu_bh_sync_ops, |
Paul E. McKenney | 804bb83 | 2009-10-25 19:03:52 -0700 | [diff] [blame] | 1433 | &srcu_ops, &srcu_expedited_ops, |
| 1434 | &sched_ops, &sched_sync_ops, &sched_expedited_ops, }; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1435 | |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1436 | mutex_lock(&fullstop_mutex); |
| 1437 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1438 | /* Process args and tell the world that the torturer is on the job. */ |
Josh Triplett | ade5fb8 | 2007-05-08 00:33:22 -0700 | [diff] [blame] | 1439 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1440 | cur_ops = torture_ops[i]; |
Josh Triplett | ade5fb8 | 2007-05-08 00:33:22 -0700 | [diff] [blame] | 1441 | if (strcmp(torture_type, cur_ops->name) == 0) |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1442 | break; |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1443 | } |
Josh Triplett | ade5fb8 | 2007-05-08 00:33:22 -0700 | [diff] [blame] | 1444 | if (i == ARRAY_SIZE(torture_ops)) { |
Paul E. McKenney | cf886c4 | 2009-10-25 19:03:54 -0700 | [diff] [blame] | 1445 | printk(KERN_ALERT "rcu-torture: invalid torture type: \"%s\"\n", |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1446 | torture_type); |
Paul E. McKenney | cf886c4 | 2009-10-25 19:03:54 -0700 | [diff] [blame] | 1447 | printk(KERN_ALERT "rcu-torture types:"); |
| 1448 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
| 1449 | printk(KERN_ALERT " %s", torture_ops[i]->name); |
| 1450 | printk(KERN_ALERT "\n"); |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1451 | mutex_unlock(&fullstop_mutex); |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 1452 | return -EINVAL; |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1453 | } |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 1454 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
| 1455 | printk(KERN_ALERT "rcu-torture: ->fqs NULL and non-zero " |
| 1456 | "fqs_duration, fqs disabled.\n"); |
| 1457 | fqs_duration = 0; |
| 1458 | } |
Josh Triplett | c8e5b16 | 2007-05-08 00:33:20 -0700 | [diff] [blame] | 1459 | if (cur_ops->init) |
Paul E. McKenney | 72e9bb5 | 2006-06-27 02:54:03 -0700 | [diff] [blame] | 1460 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
| 1461 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1462 | if (nreaders >= 0) |
| 1463 | nrealreaders = nreaders; |
| 1464 | else |
| 1465 | nrealreaders = 2 * num_online_cpus(); |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1466 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
Paul E. McKenney | c9d557c | 2009-01-07 14:33:30 -0800 | [diff] [blame] | 1467 | fullstop = FULLSTOP_DONTSTOP; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1468 | |
| 1469 | /* Set up the freelist. */ |
| 1470 | |
| 1471 | INIT_LIST_HEAD(&rcu_torture_freelist); |
Ahmed S. Darwish | 788e770 | 2007-05-08 00:33:14 -0700 | [diff] [blame] | 1472 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1473 | rcu_tortures[i].rtort_mbtest = 0; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1474 | list_add_tail(&rcu_tortures[i].rtort_free, |
| 1475 | &rcu_torture_freelist); |
| 1476 | } |
| 1477 | |
| 1478 | /* Initialize the statistics so that each run gets its own numbers. */ |
| 1479 | |
| 1480 | rcu_torture_current = NULL; |
| 1481 | rcu_torture_current_version = 0; |
| 1482 | atomic_set(&n_rcu_torture_alloc, 0); |
| 1483 | atomic_set(&n_rcu_torture_alloc_fail, 0); |
| 1484 | atomic_set(&n_rcu_torture_free, 0); |
Paul E. McKenney | 996417d | 2005-11-18 01:10:50 -0800 | [diff] [blame] | 1485 | atomic_set(&n_rcu_torture_mberror, 0); |
| 1486 | atomic_set(&n_rcu_torture_error, 0); |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1487 | n_rcu_torture_boost_ktrerror = 0; |
| 1488 | n_rcu_torture_boost_rterror = 0; |
| 1489 | n_rcu_torture_boost_allocerror = 0; |
| 1490 | n_rcu_torture_boost_afferror = 0; |
| 1491 | n_rcu_torture_boost_failure = 0; |
| 1492 | n_rcu_torture_boosts = 0; |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1493 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
| 1494 | atomic_set(&rcu_torture_wcount[i], 0); |
KAMEZAWA Hiroyuki | 0a94502 | 2006-03-28 01:56:37 -0800 | [diff] [blame] | 1495 | for_each_possible_cpu(cpu) { |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1496 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
| 1497 | per_cpu(rcu_torture_count, cpu)[i] = 0; |
| 1498 | per_cpu(rcu_torture_batch, cpu)[i] = 0; |
| 1499 | } |
| 1500 | } |
| 1501 | |
| 1502 | /* Start up the kthreads. */ |
| 1503 | |
| 1504 | VERBOSE_PRINTK_STRING("Creating rcu_torture_writer task"); |
| 1505 | writer_task = kthread_run(rcu_torture_writer, NULL, |
| 1506 | "rcu_torture_writer"); |
| 1507 | if (IS_ERR(writer_task)) { |
| 1508 | firsterr = PTR_ERR(writer_task); |
| 1509 | VERBOSE_PRINTK_ERRSTRING("Failed to create writer"); |
| 1510 | writer_task = NULL; |
| 1511 | goto unwind; |
| 1512 | } |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1513 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 1514 | GFP_KERNEL); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1515 | if (fakewriter_tasks == NULL) { |
| 1516 | VERBOSE_PRINTK_ERRSTRING("out of memory"); |
| 1517 | firsterr = -ENOMEM; |
| 1518 | goto unwind; |
| 1519 | } |
| 1520 | for (i = 0; i < nfakewriters; i++) { |
| 1521 | VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); |
| 1522 | fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 1523 | "rcu_torture_fakewriter"); |
Josh Triplett | b772e1d | 2006-10-04 02:17:13 -0700 | [diff] [blame] | 1524 | if (IS_ERR(fakewriter_tasks[i])) { |
| 1525 | firsterr = PTR_ERR(fakewriter_tasks[i]); |
| 1526 | VERBOSE_PRINTK_ERRSTRING("Failed to create fakewriter"); |
| 1527 | fakewriter_tasks[i] = NULL; |
| 1528 | goto unwind; |
| 1529 | } |
| 1530 | } |
Josh Triplett | 2860aab | 2006-10-04 02:17:11 -0700 | [diff] [blame] | 1531 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1532 | GFP_KERNEL); |
| 1533 | if (reader_tasks == NULL) { |
| 1534 | VERBOSE_PRINTK_ERRSTRING("out of memory"); |
| 1535 | firsterr = -ENOMEM; |
| 1536 | goto unwind; |
| 1537 | } |
| 1538 | for (i = 0; i < nrealreaders; i++) { |
| 1539 | VERBOSE_PRINTK_STRING("Creating rcu_torture_reader task"); |
| 1540 | reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, |
| 1541 | "rcu_torture_reader"); |
| 1542 | if (IS_ERR(reader_tasks[i])) { |
| 1543 | firsterr = PTR_ERR(reader_tasks[i]); |
| 1544 | VERBOSE_PRINTK_ERRSTRING("Failed to create reader"); |
| 1545 | reader_tasks[i] = NULL; |
| 1546 | goto unwind; |
| 1547 | } |
| 1548 | } |
| 1549 | if (stat_interval > 0) { |
| 1550 | VERBOSE_PRINTK_STRING("Creating rcu_torture_stats task"); |
| 1551 | stats_task = kthread_run(rcu_torture_stats, NULL, |
| 1552 | "rcu_torture_stats"); |
| 1553 | if (IS_ERR(stats_task)) { |
| 1554 | firsterr = PTR_ERR(stats_task); |
| 1555 | VERBOSE_PRINTK_ERRSTRING("Failed to create stats"); |
| 1556 | stats_task = NULL; |
| 1557 | goto unwind; |
| 1558 | } |
| 1559 | } |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1560 | if (test_no_idle_hz) { |
| 1561 | rcu_idle_cpu = num_online_cpus() - 1; |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1562 | |
| 1563 | if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { |
| 1564 | firsterr = -ENOMEM; |
| 1565 | VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask"); |
| 1566 | goto unwind; |
| 1567 | } |
| 1568 | |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1569 | /* Create the shuffler thread */ |
| 1570 | shuffler_task = kthread_run(rcu_torture_shuffle, NULL, |
| 1571 | "rcu_torture_shuffle"); |
| 1572 | if (IS_ERR(shuffler_task)) { |
Rusty Russell | 73d0a4b | 2009-03-30 22:05:16 -0600 | [diff] [blame] | 1573 | free_cpumask_var(shuffle_tmp_mask); |
Srivatsa Vaddagiri | d84f520 | 2006-01-08 01:03:42 -0800 | [diff] [blame] | 1574 | firsterr = PTR_ERR(shuffler_task); |
| 1575 | VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); |
| 1576 | shuffler_task = NULL; |
| 1577 | goto unwind; |
| 1578 | } |
| 1579 | } |
Paul E. McKenney | d120f65 | 2008-06-18 05:21:44 -0700 | [diff] [blame] | 1580 | if (stutter < 0) |
| 1581 | stutter = 0; |
| 1582 | if (stutter) { |
| 1583 | /* Create the stutter thread */ |
| 1584 | stutter_task = kthread_run(rcu_torture_stutter, NULL, |
| 1585 | "rcu_torture_stutter"); |
| 1586 | if (IS_ERR(stutter_task)) { |
| 1587 | firsterr = PTR_ERR(stutter_task); |
| 1588 | VERBOSE_PRINTK_ERRSTRING("Failed to create stutter"); |
| 1589 | stutter_task = NULL; |
| 1590 | goto unwind; |
| 1591 | } |
| 1592 | } |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 1593 | if (fqs_duration < 0) |
| 1594 | fqs_duration = 0; |
| 1595 | if (fqs_duration) { |
| 1596 | /* Create the stutter thread */ |
| 1597 | fqs_task = kthread_run(rcu_torture_fqs, NULL, |
| 1598 | "rcu_torture_fqs"); |
| 1599 | if (IS_ERR(fqs_task)) { |
| 1600 | firsterr = PTR_ERR(fqs_task); |
| 1601 | VERBOSE_PRINTK_ERRSTRING("Failed to create fqs"); |
| 1602 | fqs_task = NULL; |
| 1603 | goto unwind; |
| 1604 | } |
| 1605 | } |
Paul E. McKenney | 8e8be45 | 2010-09-02 16:16:14 -0700 | [diff] [blame] | 1606 | if (test_boost_interval < 1) |
| 1607 | test_boost_interval = 1; |
| 1608 | if (test_boost_duration < 2) |
| 1609 | test_boost_duration = 2; |
| 1610 | if ((test_boost == 1 && cur_ops->can_boost) || |
| 1611 | test_boost == 2) { |
| 1612 | int retval; |
| 1613 | |
| 1614 | boost_starttime = jiffies + test_boost_interval * HZ; |
| 1615 | register_cpu_notifier(&rcutorture_cpu_nb); |
| 1616 | for_each_possible_cpu(i) { |
| 1617 | if (cpu_is_offline(i)) |
| 1618 | continue; /* Heuristic: CPU can go offline. */ |
| 1619 | retval = rcutorture_booster_init(i); |
| 1620 | if (retval < 0) { |
| 1621 | firsterr = retval; |
| 1622 | goto unwind; |
| 1623 | } |
| 1624 | } |
| 1625 | } |
| 1626 | register_reboot_notifier(&rcutorture_shutdown_nb); |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1627 | mutex_unlock(&fullstop_mutex); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1628 | return 0; |
| 1629 | |
| 1630 | unwind: |
Paul E. McKenney | 343e909 | 2008-12-15 16:13:07 -0800 | [diff] [blame] | 1631 | mutex_unlock(&fullstop_mutex); |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 1632 | rcu_torture_cleanup(); |
| 1633 | return firsterr; |
| 1634 | } |
| 1635 | |
| 1636 | module_init(rcu_torture_init); |
| 1637 | module_exit(rcu_torture_cleanup); |