/* * Module-based torture test facility for locking * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, you can access it online at * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright (C) IBM Corporation, 2014 * * Authors: Paul E. McKenney <paulmck@us.ibm.com> * Davidlohr Bueso <dave@stgolabs.net> * Based on kernel/rcu/torture.c. */#include <linux/kernel.h>#include <linux/module.h>#include <linux/kthread.h>#include <linux/sched/rt.h>#include <linux/spinlock.h>#include <linux/rwlock.h>#include <linux/mutex.h>#include <linux/rwsem.h>#include <linux/smp.h>#include <linux/interrupt.h>#include <linux/sched.h>#include <linux/atomic.h>#include <linux/moduleparam.h>#include <linux/delay.h>#include <linux/slab.h>#include <linux/percpu-rwsem.h>#include <linux/torture.h> MODULE_LICENSE("GPL");MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>"); torture_param(int, nwriters_stress, -1, "Number of write-locking stress-test threads");torture_param(int, nreaders_stress, -1, "Number of read-locking stress-test threads");torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)");torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable");torture_param(int, shuffle_interval, 3, "Number of jiffies between shuffles, 0=disable");torture_param(int, shutdown_secs, 0, "Shutdown time (j), <= zero to disable.");torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s");torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable");torture_param(bool, verbose, true, "Enable verbose debugging printk()s"); static char *torture_type = "spin_lock";module_param(torture_type, charp, 0444);MODULE_PARM_DESC(torture_type, "Type of lock to torture (spin_lock, spin_lock_irq, mutex_lock, ...)"); static struct task_struct *stats_task;static struct task_struct **writer_tasks;static struct task_struct **reader_tasks; static bool lock_is_write_held;static bool lock_is_read_held; struct lock_stress_stats { long n_lock_fail; long n_lock_acquired;}; #if defined(MODULE)#define LOCKTORTURE_RUNNABLE_INIT 1#else#define LOCKTORTURE_RUNNABLE_INIT 0#endifint torture_runnable = LOCKTORTURE_RUNNABLE_INIT;module_param(torture_runnable, int, 0444);MODULE_PARM_DESC(torture_runnable, "Start locktorture at module init"); /* Forward reference. */static void lock_torture_cleanup(void); /* * Operations vector for selecting different types of tests. */struct lock_torture_ops { void (*init)(void); int (*writelock)(void); void (*write_delay)(struct torture_random_state *trsp); void (*task_boost)(struct torture_random_state *trsp); void (*writeunlock)(void); int (*readlock)(void); void (*read_delay)(struct torture_random_state *trsp); void (*readunlock)(void); unsigned long flags; /* for irq spinlocks */ const char *name;}; struct lock_torture_cxt { int nrealwriters_stress; int nrealreaders_stress; bool debug_lock; atomic_t n_lock_torture_errors; struct lock_torture_ops *cur_ops; struct lock_stress_stats *lwsa; /* writer statistics */ struct lock_stress_stats *lrsa; /* reader statistics */};static struct lock_torture_cxt cxt = { 0, 0, false, ATOMIC_INIT(0), NULL, NULL};/* * Definitions for lock torture testing. */ static int torture_lock_busted_write_lock(void){ return 0; /* BUGGY, do not use in real life!!! */} static void torture_lock_busted_write_delay(struct torture_random_state *trsp){ const unsigned long longdelay_ms = 100; /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms);#ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */#endif} static void torture_lock_busted_write_unlock(void){ /* BUGGY, do not use in real life!!! */} static void torture_boost_dummy(struct torture_random_state *trsp){ /* Only rtmutexes care about priority */} static struct lock_torture_ops lock_busted_ops = { .writelock = torture_lock_busted_write_lock, .write_delay = torture_lock_busted_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_lock_busted_write_unlock, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "lock_busted"}; static DEFINE_SPINLOCK(torture_spinlock); static int torture_spin_lock_write_lock(void) __acquires(torture_spinlock){ spin_lock(&torture_spinlock); return 0;} static void torture_spin_lock_write_delay(struct torture_random_state *trsp){ const unsigned long shortdelay_us = 2; const unsigned long longdelay_ms = 100; /* We want a short delay mostly to emulate likely code, and * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2 * shortdelay_us))) udelay(shortdelay_us);#ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */#endif} static void torture_spin_lock_write_unlock(void) __releases(torture_spinlock){ spin_unlock(&torture_spinlock);} static struct lock_torture_ops spin_lock_ops = { .writelock = torture_spin_lock_write_lock, .write_delay = torture_spin_lock_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_spin_lock_write_unlock, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "spin_lock"}; static int torture_spin_lock_write_lock_irq(void)__acquires(torture_spinlock){ unsigned long flags; spin_lock_irqsave(&torture_spinlock, flags); cxt.cur_ops->flags = flags; return 0;} static void torture_lock_spin_write_unlock_irq(void)__releases(torture_spinlock){ spin_unlock_irqrestore(&torture_spinlock, cxt.cur_ops->flags);} static struct lock_torture_ops spin_lock_irq_ops = { .writelock = torture_spin_lock_write_lock_irq, .write_delay = torture_spin_lock_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_lock_spin_write_unlock_irq, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "spin_lock_irq"}; static DEFINE_RWLOCK(torture_rwlock); static int torture_rwlock_write_lock(void) __acquires(torture_rwlock){ write_lock(&torture_rwlock); return 0;} static void torture_rwlock_write_delay(struct torture_random_state *trsp){ const unsigned long shortdelay_us = 2; const unsigned long longdelay_ms = 100; /* We want a short delay mostly to emulate likely code, and * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); else udelay(shortdelay_us);} static void torture_rwlock_write_unlock(void) __releases(torture_rwlock){ write_unlock(&torture_rwlock);} static int torture_rwlock_read_lock(void) __acquires(torture_rwlock){ read_lock(&torture_rwlock); return 0;} static void torture_rwlock_read_delay(struct torture_random_state *trsp){ const unsigned long shortdelay_us = 10; const unsigned long longdelay_ms = 100; /* We want a short delay mostly to emulate likely code, and * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealreaders_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); else udelay(shortdelay_us);} static void torture_rwlock_read_unlock(void) __releases(torture_rwlock){ read_unlock(&torture_rwlock);} static struct lock_torture_ops rw_lock_ops = { .writelock = torture_rwlock_write_lock, .write_delay = torture_rwlock_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_rwlock_write_unlock, .readlock = torture_rwlock_read_lock, .read_delay = torture_rwlock_read_delay, .readunlock = torture_rwlock_read_unlock, .name = "rw_lock"}; static int torture_rwlock_write_lock_irq(void) __acquires(torture_rwlock){ unsigned long flags; write_lock_irqsave(&torture_rwlock, flags); cxt.cur_ops->flags = flags; return 0;} static void torture_rwlock_write_unlock_irq(void)__releases(torture_rwlock){ write_unlock_irqrestore(&torture_rwlock, cxt.cur_ops->flags);} static int torture_rwlock_read_lock_irq(void) __acquires(torture_rwlock){ unsigned long flags; read_lock_irqsave(&torture_rwlock, flags); cxt.cur_ops->flags = flags; return 0;} static void torture_rwlock_read_unlock_irq(void)__releases(torture_rwlock){ read_unlock_irqrestore(&torture_rwlock, cxt.cur_ops->flags);} static struct lock_torture_ops rw_lock_irq_ops = { .writelock = torture_rwlock_write_lock_irq, .write_delay = torture_rwlock_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_rwlock_write_unlock_irq, .readlock = torture_rwlock_read_lock_irq, .read_delay = torture_rwlock_read_delay, .readunlock = torture_rwlock_read_unlock_irq, .name = "rw_lock_irq"}; static DEFINE_MUTEX(torture_mutex); static int torture_mutex_lock(void) __acquires(torture_mutex){ mutex_lock(&torture_mutex); return 0;} static void torture_mutex_delay(struct torture_random_state *trsp){ const unsigned long longdelay_ms = 100; /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms * 5); else mdelay(longdelay_ms / 5);#ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */#endif} static void torture_mutex_unlock(void) __releases(torture_mutex){ mutex_unlock(&torture_mutex);} static struct lock_torture_ops mutex_lock_ops = { .writelock = torture_mutex_lock, .write_delay = torture_mutex_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_mutex_unlock, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "mutex_lock"}; #ifdef CONFIG_RT_MUTEXESstatic DEFINE_RT_MUTEX(torture_rtmutex); static int torture_rtmutex_lock(void) __acquires(torture_rtmutex){ rt_mutex_lock(&torture_rtmutex); return 0;} static void torture_rtmutex_boost(struct torture_random_state *trsp){ int policy; struct sched_param param; const unsigned int factor = 50000; /* yes, quite arbitrary */ if (!rt_task(current)) { /* * (1) Boost priority once every ~50k operations. When the * task tries to take the lock, the rtmutex it will account * for the new priority, and do any corresponding pi-dance. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * factor))) { policy = SCHED_FIFO; param.sched_priority = MAX_RT_PRIO - 1; } else /* common case, do nothing */ return; } else { /* * The task will remain boosted for another ~500k operations, * then restored back to its original prio, and so forth. * * When @trsp is nil, we want to force-reset the task for * stopping the kthread. */ if (!trsp || !(torture_random(trsp) % (cxt.nrealwriters_stress * factor * 2))) { policy = SCHED_NORMAL; param.sched_priority = 0; } else /* common case, do nothing */ return; } sched_setscheduler_nocheck(current, policy, ¶m);} static void torture_rtmutex_delay(struct torture_random_state *trsp){ const unsigned long shortdelay_us = 2; const unsigned long longdelay_ms = 100; /* * We want a short delay mostly to emulate likely code, and * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2 * shortdelay_us))) udelay(shortdelay_us);#ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */#endif} static void torture_rtmutex_unlock(void) __releases(torture_rtmutex){ rt_mutex_unlock(&torture_rtmutex);} static struct lock_torture_ops rtmutex_lock_ops = { .writelock = torture_rtmutex_lock, .write_delay = torture_rtmutex_delay, .task_boost = torture_rtmutex_boost, .writeunlock = torture_rtmutex_unlock, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "rtmutex_lock"};#endif static DECLARE_RWSEM(torture_rwsem);static int torture_rwsem_down_write(void) __acquires(torture_rwsem){ down_write(&torture_rwsem); return 0;} static void torture_rwsem_write_delay(struct torture_random_state *trsp){ const unsigned long longdelay_ms = 100; /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms * 10); else mdelay(longdelay_ms / 10);#ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */#endif} static void torture_rwsem_up_write(void) __releases(torture_rwsem){ up_write(&torture_rwsem);} static int torture_rwsem_down_read(void) __acquires(torture_rwsem){ down_read(&torture_rwsem); return 0;} static void torture_rwsem_read_delay(struct torture_random_state *trsp){ const unsigned long longdelay_ms = 100;Lines 1–500 of 969. 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/* * Module-based torture test facility for locking * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, you can access it online at * http://www.gnu.org/licenses/gpl-2.0.html. * * Copyright (C) IBM Corporation, 2014 * * Authors: Paul E. McKenney <paulmck@us.ibm.com> * Davidlohr Bueso <dave@stgolabs.net> * Based on kernel/rcu/torture.c. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/kthread.h> #include <linux/sched/rt.h> #include <linux/spinlock.h> #include <linux/rwlock.h> #include <linux/mutex.h> #include <linux/rwsem.h> #include <linux/smp.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/atomic.h> #include <linux/moduleparam.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/percpu-rwsem.h> #include <linux/torture.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>"); torture_param(int, nwriters_stress, -1, "Number of write-locking stress-test threads"); torture_param(int, nreaders_stress, -1, "Number of read-locking stress-test threads"); torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable"); torture_param(int, shuffle_interval, 3, "Number of jiffies between shuffles, 0=disable"); torture_param(int, shutdown_secs, 0, "Shutdown time (j), <= zero to disable."); torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s"); torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); torture_param(bool, verbose, true, "Enable verbose debugging printk()s"); static char *torture_type = "spin_lock"; module_param(torture_type, charp, 0444); MODULE_PARM_DESC(torture_type, "Type of lock to torture (spin_lock, spin_lock_irq, mutex_lock, ...)"); static struct task_struct *stats_task; static struct task_struct **writer_tasks; static struct task_struct **reader_tasks; static bool lock_is_write_held; static bool lock_is_read_held; struct lock_stress_stats { long n_lock_fail; long n_lock_acquired; }; #if defined(MODULE) #define LOCKTORTURE_RUNNABLE_INIT 1 #else #define LOCKTORTURE_RUNNABLE_INIT 0 #endif int torture_runnable = LOCKTORTURE_RUNNABLE_INIT; module_param(torture_runnable, int, 0444); MODULE_PARM_DESC(torture_runnable, "Start locktorture at module init"); /* Forward reference. */ static void lock_torture_cleanup(void); /* * Operations vector for selecting different types of tests. */ struct lock_torture_ops { void (*init)(void); int (*writelock)(void); void (*write_delay)(struct torture_random_state *trsp); void (*task_boost)(struct torture_random_state *trsp); void (*writeunlock)(void); int (*readlock)(void); void (*read_delay)(struct torture_random_state *trsp); void (*readunlock)(void); unsigned long flags; /* for irq spinlocks */ const char *name; }; struct lock_torture_cxt { int nrealwriters_stress; int nrealreaders_stress; bool debug_lock; atomic_t n_lock_torture_errors; struct lock_torture_ops *cur_ops; struct lock_stress_stats *lwsa; /* writer statistics */ struct lock_stress_stats *lrsa; /* reader statistics */ }; static struct lock_torture_cxt cxt = { 0, 0, false, ATOMIC_INIT(0), NULL, NULL}; /* * Definitions for lock torture testing. */ static int torture_lock_busted_write_lock(void) { return 0; /* BUGGY, do not use in real life!!! */ } static void torture_lock_busted_write_delay(struct torture_random_state *trsp) { const unsigned long longdelay_ms = 100; /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); #ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } static void torture_lock_busted_write_unlock(void) { /* BUGGY, do not use in real life!!! */ } static void torture_boost_dummy(struct torture_random_state *trsp) { /* Only rtmutexes care about priority */ } static struct lock_torture_ops lock_busted_ops = { .writelock = torture_lock_busted_write_lock, .write_delay = torture_lock_busted_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_lock_busted_write_unlock, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "lock_busted" }; static DEFINE_SPINLOCK(torture_spinlock); static int torture_spin_lock_write_lock(void) __acquires(torture_spinlock) { spin_lock(&torture_spinlock); return 0; } static void torture_spin_lock_write_delay(struct torture_random_state *trsp) { const unsigned long shortdelay_us = 2; const unsigned long longdelay_ms = 100; /* We want a short delay mostly to emulate likely code, and * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2 * shortdelay_us))) udelay(shortdelay_us); #ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } static void torture_spin_lock_write_unlock(void) __releases(torture_spinlock) { spin_unlock(&torture_spinlock); } static struct lock_torture_ops spin_lock_ops = { .writelock = torture_spin_lock_write_lock, .write_delay = torture_spin_lock_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_spin_lock_write_unlock, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "spin_lock" }; static int torture_spin_lock_write_lock_irq(void) __acquires(torture_spinlock) { unsigned long flags; spin_lock_irqsave(&torture_spinlock, flags); cxt.cur_ops->flags = flags; return 0; } static void torture_lock_spin_write_unlock_irq(void) __releases(torture_spinlock) { spin_unlock_irqrestore(&torture_spinlock, cxt.cur_ops->flags); } static struct lock_torture_ops spin_lock_irq_ops = { .writelock = torture_spin_lock_write_lock_irq, .write_delay = torture_spin_lock_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_lock_spin_write_unlock_irq, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "spin_lock_irq" }; static DEFINE_RWLOCK(torture_rwlock); static int torture_rwlock_write_lock(void) __acquires(torture_rwlock) { write_lock(&torture_rwlock); return 0; } static void torture_rwlock_write_delay(struct torture_random_state *trsp) { const unsigned long shortdelay_us = 2; const unsigned long longdelay_ms = 100; /* We want a short delay mostly to emulate likely code, and * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); else udelay(shortdelay_us); } static void torture_rwlock_write_unlock(void) __releases(torture_rwlock) { write_unlock(&torture_rwlock); } static int torture_rwlock_read_lock(void) __acquires(torture_rwlock) { read_lock(&torture_rwlock); return 0; } static void torture_rwlock_read_delay(struct torture_random_state *trsp) { const unsigned long shortdelay_us = 10; const unsigned long longdelay_ms = 100; /* We want a short delay mostly to emulate likely code, and * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealreaders_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); else udelay(shortdelay_us); } static void torture_rwlock_read_unlock(void) __releases(torture_rwlock) { read_unlock(&torture_rwlock); } static struct lock_torture_ops rw_lock_ops = { .writelock = torture_rwlock_write_lock, .write_delay = torture_rwlock_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_rwlock_write_unlock, .readlock = torture_rwlock_read_lock, .read_delay = torture_rwlock_read_delay, .readunlock = torture_rwlock_read_unlock, .name = "rw_lock" }; static int torture_rwlock_write_lock_irq(void) __acquires(torture_rwlock) { unsigned long flags; write_lock_irqsave(&torture_rwlock, flags); cxt.cur_ops->flags = flags; return 0; } static void torture_rwlock_write_unlock_irq(void) __releases(torture_rwlock) { write_unlock_irqrestore(&torture_rwlock, cxt.cur_ops->flags); } static int torture_rwlock_read_lock_irq(void) __acquires(torture_rwlock) { unsigned long flags; read_lock_irqsave(&torture_rwlock, flags); cxt.cur_ops->flags = flags; return 0; } static void torture_rwlock_read_unlock_irq(void) __releases(torture_rwlock) { read_unlock_irqrestore(&torture_rwlock, cxt.cur_ops->flags); } static struct lock_torture_ops rw_lock_irq_ops = { .writelock = torture_rwlock_write_lock_irq, .write_delay = torture_rwlock_write_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_rwlock_write_unlock_irq, .readlock = torture_rwlock_read_lock_irq, .read_delay = torture_rwlock_read_delay, .readunlock = torture_rwlock_read_unlock_irq, .name = "rw_lock_irq" }; static DEFINE_MUTEX(torture_mutex); static int torture_mutex_lock(void) __acquires(torture_mutex) { mutex_lock(&torture_mutex); return 0; } static void torture_mutex_delay(struct torture_random_state *trsp) { const unsigned long longdelay_ms = 100; /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms * 5); else mdelay(longdelay_ms / 5); #ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } static void torture_mutex_unlock(void) __releases(torture_mutex) { mutex_unlock(&torture_mutex); } static struct lock_torture_ops mutex_lock_ops = { .writelock = torture_mutex_lock, .write_delay = torture_mutex_delay, .task_boost = torture_boost_dummy, .writeunlock = torture_mutex_unlock, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "mutex_lock" }; #ifdef CONFIG_RT_MUTEXES static DEFINE_RT_MUTEX(torture_rtmutex); static int torture_rtmutex_lock(void) __acquires(torture_rtmutex) { rt_mutex_lock(&torture_rtmutex); return 0; } static void torture_rtmutex_boost(struct torture_random_state *trsp) { int policy; struct sched_param param; const unsigned int factor = 50000; /* yes, quite arbitrary */ if (!rt_task(current)) { /* * (1) Boost priority once every ~50k operations. When the * task tries to take the lock, the rtmutex it will account * for the new priority, and do any corresponding pi-dance. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * factor))) { policy = SCHED_FIFO; param.sched_priority = MAX_RT_PRIO - 1; } else /* common case, do nothing */ return; } else { /* * The task will remain boosted for another ~500k operations, * then restored back to its original prio, and so forth. * * When @trsp is nil, we want to force-reset the task for * stopping the kthread. */ if (!trsp || !(torture_random(trsp) % (cxt.nrealwriters_stress * factor * 2))) { policy = SCHED_NORMAL; param.sched_priority = 0; } else /* common case, do nothing */ return; } sched_setscheduler_nocheck(current, policy, ¶m); } static void torture_rtmutex_delay(struct torture_random_state *trsp) { const unsigned long shortdelay_us = 2; const unsigned long longdelay_ms = 100; /* * We want a short delay mostly to emulate likely code, and * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms); if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2 * shortdelay_us))) udelay(shortdelay_us); #ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } static void torture_rtmutex_unlock(void) __releases(torture_rtmutex) { rt_mutex_unlock(&torture_rtmutex); } static struct lock_torture_ops rtmutex_lock_ops = { .writelock = torture_rtmutex_lock, .write_delay = torture_rtmutex_delay, .task_boost = torture_rtmutex_boost, .writeunlock = torture_rtmutex_unlock, .readlock = NULL, .read_delay = NULL, .readunlock = NULL, .name = "rtmutex_lock" }; #endif static DECLARE_RWSEM(torture_rwsem); static int torture_rwsem_down_write(void) __acquires(torture_rwsem) { down_write(&torture_rwsem); return 0; } static void torture_rwsem_write_delay(struct torture_random_state *trsp) { const unsigned long longdelay_ms = 100; /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms * 10); else mdelay(longdelay_ms / 10); #ifdef CONFIG_PREEMPT if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } static void torture_rwsem_up_write(void) __releases(torture_rwsem) { up_write(&torture_rwsem); } static int torture_rwsem_down_read(void) __acquires(torture_rwsem) { down_read(&torture_rwsem); return 0; } static void torture_rwsem_read_delay(struct torture_random_state *trsp) { const unsigned long longdelay_ms = 100;