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kernel/rcutorture.c
38.5 KB
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/* |
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* Read-Copy Update module-based torture test facility |
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* * 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
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* Copyright (C) IBM Corporation, 2005, 2006 |
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* * Authors: Paul E. McKenney <paulmck@us.ibm.com> |
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* Josh Triplett <josh@freedesktop.org> |
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* * See also: Documentation/RCU/torture.txt */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/kthread.h> #include <linux/err.h> #include <linux/spinlock.h> #include <linux/smp.h> #include <linux/rcupdate.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <asm/atomic.h> #include <linux/bitops.h> |
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#include <linux/completion.h> #include <linux/moduleparam.h> #include <linux/percpu.h> #include <linux/notifier.h> |
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#include <linux/reboot.h> |
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#include <linux/freezer.h> |
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#include <linux/cpu.h> |
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#include <linux/delay.h> |
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#include <linux/stat.h> |
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#include <linux/srcu.h> |
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#include <linux/slab.h> |
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#include <asm/byteorder.h> |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and " |
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"Josh Triplett <josh@freedesktop.org>"); |
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|
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static int nreaders = -1; /* # reader threads, defaults to 2*ncpus */ |
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static int nfakewriters = 4; /* # fake writer threads */ |
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static int stat_interval; /* Interval between stats, in seconds. */ |
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/* Defaults to "only at end of test". */ |
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static int verbose; /* Print more debug info. */ static int test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */ |
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static int shuffle_interval = 3; /* Interval between shuffles (in sec)*/ static int stutter = 5; /* Start/stop testing interval (in sec) */ |
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static int irqreader = 1; /* RCU readers from irq (timers). */ |
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static int fqs_duration = 0; /* Duration of bursts (us), 0 to disable. */ static int fqs_holdoff = 0; /* Hold time within burst (us). */ static int fqs_stutter = 3; /* Wait time between bursts (s). */ |
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static char *torture_type = "rcu"; /* What RCU implementation to torture. */ |
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|
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module_param(nreaders, int, 0444); |
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MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); |
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module_param(nfakewriters, int, 0444); |
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MODULE_PARM_DESC(nfakewriters, "Number of RCU fake writer threads"); |
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module_param(stat_interval, int, 0444); |
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MODULE_PARM_DESC(stat_interval, "Number of seconds between stats printk()s"); |
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module_param(verbose, bool, 0444); |
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MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); |
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module_param(test_no_idle_hz, bool, 0444); |
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MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs"); |
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module_param(shuffle_interval, int, 0444); |
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MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles"); |
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module_param(stutter, int, 0444); MODULE_PARM_DESC(stutter, "Number of seconds to run/halt test"); |
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module_param(irqreader, int, 0444); MODULE_PARM_DESC(irqreader, "Allow RCU readers from irq handlers"); |
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module_param(fqs_duration, int, 0444); MODULE_PARM_DESC(fqs_duration, "Duration of fqs bursts (us)"); module_param(fqs_holdoff, int, 0444); MODULE_PARM_DESC(fqs_holdoff, "Holdoff time within fqs bursts (us)"); module_param(fqs_stutter, int, 0444); MODULE_PARM_DESC(fqs_stutter, "Wait time between fqs bursts (s)"); |
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module_param(torture_type, charp, 0444); |
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MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, srcu)"); |
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#define TORTURE_FLAG "-torture:" |
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#define PRINTK_STRING(s) \ |
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do { printk(KERN_ALERT "%s" TORTURE_FLAG s " ", torture_type); } while (0) |
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#define VERBOSE_PRINTK_STRING(s) \ |
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do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG s " ", torture_type); } while (0) |
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#define VERBOSE_PRINTK_ERRSTRING(s) \ |
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do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG "!!! " s " ", torture_type); } while (0) |
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static char printk_buf[4096]; static int nrealreaders; static struct task_struct *writer_task; |
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static struct task_struct **fakewriter_tasks; |
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static struct task_struct **reader_tasks; static struct task_struct *stats_task; |
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static struct task_struct *shuffler_task; |
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static struct task_struct *stutter_task; |
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static struct task_struct *fqs_task; |
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#define RCU_TORTURE_PIPE_LEN 10 struct rcu_torture { struct rcu_head rtort_rcu; int rtort_pipe_count; struct list_head rtort_free; |
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int rtort_mbtest; |
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}; |
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static LIST_HEAD(rcu_torture_freelist); |
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static struct rcu_torture *rcu_torture_current; static long rcu_torture_current_version; |
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static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; static DEFINE_SPINLOCK(rcu_torture_lock); static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count) = { 0 }; static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch) = { 0 }; static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
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static atomic_t n_rcu_torture_alloc; static atomic_t n_rcu_torture_alloc_fail; static atomic_t n_rcu_torture_free; static atomic_t n_rcu_torture_mberror; static atomic_t n_rcu_torture_error; |
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static long n_rcu_torture_timers; |
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static struct list_head rcu_torture_removed; |
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static cpumask_var_t shuffle_tmp_mask; |
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|
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static int stutter_pause_test; |
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#if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) #define RCUTORTURE_RUNNABLE_INIT 1 #else #define RCUTORTURE_RUNNABLE_INIT 0 #endif int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; |
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/* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */ #define FULLSTOP_DONTSTOP 0 /* Normal operation. */ #define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */ #define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */ static int fullstop = FULLSTOP_RMMOD; DEFINE_MUTEX(fullstop_mutex); /* Protect fullstop transitions and spawning */ /* of kthreads. */ |
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/* |
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* Detect and respond to a system shutdown. |
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*/ static int rcutorture_shutdown_notify(struct notifier_block *unused1, unsigned long unused2, void *unused3) { |
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mutex_lock(&fullstop_mutex); |
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if (fullstop == FULLSTOP_DONTSTOP) |
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fullstop = FULLSTOP_SHUTDOWN; |
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else printk(KERN_WARNING /* but going down anyway, so... */ "Concurrent 'rmmod rcutorture' and shutdown illegal! "); |
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mutex_unlock(&fullstop_mutex); |
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return NOTIFY_DONE; } |
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/* |
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* Absorb kthreads into a kernel function that won't return, so that * they won't ever access module text or data again. */ static void rcutorture_shutdown_absorb(char *title) { if (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { printk(KERN_NOTICE "rcutorture thread %s parking due to system shutdown ", title); schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); } } /* |
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* Allocate an element from the rcu_tortures pool. */ |
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static struct rcu_torture * |
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rcu_torture_alloc(void) { struct list_head *p; |
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spin_lock_bh(&rcu_torture_lock); |
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if (list_empty(&rcu_torture_freelist)) { atomic_inc(&n_rcu_torture_alloc_fail); |
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spin_unlock_bh(&rcu_torture_lock); |
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return NULL; } atomic_inc(&n_rcu_torture_alloc); p = rcu_torture_freelist.next; list_del_init(p); |
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spin_unlock_bh(&rcu_torture_lock); |
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return container_of(p, struct rcu_torture, rtort_free); } /* * Free an element to the rcu_tortures pool. */ static void rcu_torture_free(struct rcu_torture *p) { atomic_inc(&n_rcu_torture_free); |
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spin_lock_bh(&rcu_torture_lock); |
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list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
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spin_unlock_bh(&rcu_torture_lock); |
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} |
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struct rcu_random_state { unsigned long rrs_state; |
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long rrs_count; |
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}; #define RCU_RANDOM_MULT 39916801 /* prime */ #define RCU_RANDOM_ADD 479001701 /* prime */ #define RCU_RANDOM_REFRESH 10000 #define DEFINE_RCU_RANDOM(name) struct rcu_random_state name = { 0, 0 } /* * Crude but fast random-number generator. Uses a linear congruential |
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* generator, with occasional help from cpu_clock(). |
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*/ |
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static unsigned long |
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rcu_random(struct rcu_random_state *rrsp) { |
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if (--rrsp->rrs_count < 0) { |
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rrsp->rrs_state += (unsigned long)local_clock(); |
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rrsp->rrs_count = RCU_RANDOM_REFRESH; } rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD; return swahw32(rrsp->rrs_state); } |
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static void |
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rcu_stutter_wait(char *title) |
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{ |
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while (stutter_pause_test || !rcutorture_runnable) { |
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if (rcutorture_runnable) schedule_timeout_interruptible(1); else |
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schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
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rcutorture_shutdown_absorb(title); |
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} |
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} |
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/* |
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* Operations vector for selecting different types of tests. */ struct rcu_torture_ops { void (*init)(void); void (*cleanup)(void); int (*readlock)(void); |
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void (*read_delay)(struct rcu_random_state *rrsp); |
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void (*readunlock)(int idx); int (*completed)(void); |
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void (*deferred_free)(struct rcu_torture *p); |
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void (*sync)(void); |
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void (*cb_barrier)(void); |
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void (*fqs)(void); |
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int (*stats)(char *page); |
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int irq_capable; |
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char *name; }; |
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static struct rcu_torture_ops *cur_ops; |
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/* * Definitions for rcu torture testing. */ |
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static int rcu_torture_read_lock(void) __acquires(RCU) |
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{ rcu_read_lock(); return 0; } |
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static void rcu_read_delay(struct rcu_random_state *rrsp) { |
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const unsigned long shortdelay_us = 200; const unsigned long longdelay_ms = 50; |
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/* We want a short delay sometimes to make a reader delay the grace * period, and we want a long delay occasionally to trigger * force_quiescent_state. */ |
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if (!(rcu_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) mdelay(longdelay_ms); if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) udelay(shortdelay_us); |
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} |
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static void rcu_torture_read_unlock(int idx) __releases(RCU) |
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{ rcu_read_unlock(); } static int rcu_torture_completed(void) { return rcu_batches_completed(); } static void rcu_torture_cb(struct rcu_head *p) { int i; struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
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if (fullstop != FULLSTOP_DONTSTOP) { |
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/* Test is ending, just drop callbacks on the floor. */ /* The next initialization will pick up the pieces. */ return; } i = rp->rtort_pipe_count; if (i > RCU_TORTURE_PIPE_LEN) i = RCU_TORTURE_PIPE_LEN; atomic_inc(&rcu_torture_wcount[i]); if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { rp->rtort_mbtest = 0; rcu_torture_free(rp); } else |
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cur_ops->deferred_free(rp); |
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} |
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static int rcu_no_completed(void) { return 0; } |
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static void rcu_torture_deferred_free(struct rcu_torture *p) { call_rcu(&p->rtort_rcu, rcu_torture_cb); } static struct rcu_torture_ops rcu_ops = { |
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.init = NULL, .cleanup = NULL, .readlock = rcu_torture_read_lock, .read_delay = rcu_read_delay, .readunlock = rcu_torture_read_unlock, .completed = rcu_torture_completed, .deferred_free = rcu_torture_deferred_free, .sync = synchronize_rcu, .cb_barrier = rcu_barrier, |
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.fqs = rcu_force_quiescent_state, |
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.stats = NULL, |
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.irq_capable = 1, .name = "rcu" |
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}; |
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static void rcu_sync_torture_deferred_free(struct rcu_torture *p) { int i; struct rcu_torture *rp; struct rcu_torture *rp1; cur_ops->sync(); list_add(&p->rtort_free, &rcu_torture_removed); list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { i = rp->rtort_pipe_count; if (i > RCU_TORTURE_PIPE_LEN) i = RCU_TORTURE_PIPE_LEN; atomic_inc(&rcu_torture_wcount[i]); if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { rp->rtort_mbtest = 0; list_del(&rp->rtort_free); rcu_torture_free(rp); } } } static void rcu_sync_torture_init(void) { INIT_LIST_HEAD(&rcu_torture_removed); } |
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static struct rcu_torture_ops rcu_sync_ops = { |
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.init = rcu_sync_torture_init, .cleanup = NULL, .readlock = rcu_torture_read_lock, .read_delay = rcu_read_delay, .readunlock = rcu_torture_read_unlock, .completed = rcu_torture_completed, .deferred_free = rcu_sync_torture_deferred_free, .sync = synchronize_rcu, .cb_barrier = NULL, |
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.fqs = rcu_force_quiescent_state, |
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.stats = NULL, .irq_capable = 1, .name = "rcu_sync" |
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}; |
d9a3da069 rcu: Add expedite... |
397 398 399 400 401 402 403 404 405 406 |
static struct rcu_torture_ops rcu_expedited_ops = { .init = rcu_sync_torture_init, .cleanup = NULL, .readlock = rcu_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = rcu_torture_read_unlock, .completed = rcu_no_completed, .deferred_free = rcu_sync_torture_deferred_free, .sync = synchronize_rcu_expedited, .cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
407 |
.fqs = rcu_force_quiescent_state, |
d9a3da069 rcu: Add expedite... |
408 409 410 411 |
.stats = NULL, .irq_capable = 1, .name = "rcu_expedited" }; |
c32e06605 [PATCH] rcutortur... |
412 413 414 |
/* * Definitions for rcu_bh torture testing. */ |
a49a4af75 [PATCH] rcu: add ... |
415 |
static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e06605 [PATCH] rcutortur... |
416 417 418 419 |
{ rcu_read_lock_bh(); return 0; } |
a49a4af75 [PATCH] rcu: add ... |
420 |
static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e06605 [PATCH] rcutortur... |
421 422 423 424 425 426 427 428 429 430 431 432 433 |
{ rcu_read_unlock_bh(); } static int rcu_bh_torture_completed(void) { return rcu_batches_completed_bh(); } static void rcu_bh_torture_deferred_free(struct rcu_torture *p) { call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); } |
b772e1dd4 [PATCH] RCU: add ... |
434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 |
struct rcu_bh_torture_synchronize { struct rcu_head head; struct completion completion; }; static void rcu_bh_torture_wakeme_after_cb(struct rcu_head *head) { struct rcu_bh_torture_synchronize *rcu; rcu = container_of(head, struct rcu_bh_torture_synchronize, head); complete(&rcu->completion); } static void rcu_bh_torture_synchronize(void) { struct rcu_bh_torture_synchronize rcu; |
72d5a9f7a rcu: remove all r... |
450 |
init_rcu_head_on_stack(&rcu.head); |
b772e1dd4 [PATCH] RCU: add ... |
451 452 453 |
init_completion(&rcu.completion); call_rcu_bh(&rcu.head, rcu_bh_torture_wakeme_after_cb); wait_for_completion(&rcu.completion); |
72d5a9f7a rcu: remove all r... |
454 |
destroy_rcu_head_on_stack(&rcu.head); |
b772e1dd4 [PATCH] RCU: add ... |
455 |
} |
c32e06605 [PATCH] rcutortur... |
456 |
static struct rcu_torture_ops rcu_bh_ops = { |
0acc512cb rcu: Add synchron... |
457 458 459 460 461 462 463 464 465 |
.init = NULL, .cleanup = NULL, .readlock = rcu_bh_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = rcu_bh_torture_read_unlock, .completed = rcu_bh_torture_completed, .deferred_free = rcu_bh_torture_deferred_free, .sync = rcu_bh_torture_synchronize, .cb_barrier = rcu_barrier_bh, |
bf66f18e7 rcu: Add force_qu... |
466 |
.fqs = rcu_bh_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
467 468 469 |
.stats = NULL, .irq_capable = 1, .name = "rcu_bh" |
c32e06605 [PATCH] rcutortur... |
470 |
}; |
11a147013 [PATCH] rcu: add ... |
471 |
static struct rcu_torture_ops rcu_bh_sync_ops = { |
0acc512cb rcu: Add synchron... |
472 473 474 475 476 477 478 479 480 |
.init = rcu_sync_torture_init, .cleanup = NULL, .readlock = rcu_bh_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = rcu_bh_torture_read_unlock, .completed = rcu_bh_torture_completed, .deferred_free = rcu_sync_torture_deferred_free, .sync = rcu_bh_torture_synchronize, .cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
481 |
.fqs = rcu_bh_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
482 483 484 |
.stats = NULL, .irq_capable = 1, .name = "rcu_bh_sync" |
11a147013 [PATCH] rcu: add ... |
485 |
}; |
b2896d2e7 [PATCH] srcu-3: a... |
486 487 488 489 490 |
/* * Definitions for srcu torture testing. */ static struct srcu_struct srcu_ctl; |
b2896d2e7 [PATCH] srcu-3: a... |
491 492 493 494 |
static void srcu_torture_init(void) { init_srcu_struct(&srcu_ctl); |
e30337365 [PATCH] rcu: refa... |
495 |
rcu_sync_torture_init(); |
b2896d2e7 [PATCH] srcu-3: a... |
496 497 498 499 500 501 502 |
} static void srcu_torture_cleanup(void) { synchronize_srcu(&srcu_ctl); cleanup_srcu_struct(&srcu_ctl); } |
012d3ca8d [PATCH] Add Spars... |
503 |
static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e7 [PATCH] srcu-3: a... |
504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 |
{ return srcu_read_lock(&srcu_ctl); } static void srcu_read_delay(struct rcu_random_state *rrsp) { long delay; const long uspertick = 1000000 / HZ; const long longdelay = 10; /* We want there to be long-running readers, but not all the time. */ delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick); if (!delay) schedule_timeout_interruptible(longdelay); } |
012d3ca8d [PATCH] Add Spars... |
520 |
static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e7 [PATCH] srcu-3: a... |
521 522 523 524 525 526 527 528 |
{ srcu_read_unlock(&srcu_ctl, idx); } static int srcu_torture_completed(void) { return srcu_batches_completed(&srcu_ctl); } |
b772e1dd4 [PATCH] RCU: add ... |
529 530 531 532 |
static void srcu_torture_synchronize(void) { synchronize_srcu(&srcu_ctl); } |
b2896d2e7 [PATCH] srcu-3: a... |
533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 |
static int srcu_torture_stats(char *page) { int cnt = 0; int cpu; int idx = srcu_ctl.completed & 0x1; cnt += sprintf(&page[cnt], "%s%s per-CPU(idx=%d):", torture_type, TORTURE_FLAG, idx); for_each_possible_cpu(cpu) { cnt += sprintf(&page[cnt], " %d(%d,%d)", cpu, per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); } cnt += sprintf(&page[cnt], " "); return cnt; } static struct rcu_torture_ops srcu_ops = { |
0acc512cb rcu: Add synchron... |
552 553 554 555 556 557 558 559 560 561 562 |
.init = srcu_torture_init, .cleanup = srcu_torture_cleanup, .readlock = srcu_torture_read_lock, .read_delay = srcu_read_delay, .readunlock = srcu_torture_read_unlock, .completed = srcu_torture_completed, .deferred_free = rcu_sync_torture_deferred_free, .sync = srcu_torture_synchronize, .cb_barrier = NULL, .stats = srcu_torture_stats, .name = "srcu" |
b2896d2e7 [PATCH] srcu-3: a... |
563 |
}; |
804bb8370 rcu: Add synchron... |
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 |
static void srcu_torture_synchronize_expedited(void) { synchronize_srcu_expedited(&srcu_ctl); } static struct rcu_torture_ops srcu_expedited_ops = { .init = srcu_torture_init, .cleanup = srcu_torture_cleanup, .readlock = srcu_torture_read_lock, .read_delay = srcu_read_delay, .readunlock = srcu_torture_read_unlock, .completed = srcu_torture_completed, .deferred_free = rcu_sync_torture_deferred_free, .sync = srcu_torture_synchronize_expedited, .cb_barrier = NULL, .stats = srcu_torture_stats, .name = "srcu_expedited" }; |
4b6c2cca6 [PATCH] rcu: add ... |
582 583 584 585 586 587 588 589 590 591 592 593 594 595 |
/* * Definitions for sched torture testing. */ static int sched_torture_read_lock(void) { preempt_disable(); return 0; } static void sched_torture_read_unlock(int idx) { preempt_enable(); } |
2326974df rcu: add call_rcu... |
596 597 598 599 |
static void rcu_sched_torture_deferred_free(struct rcu_torture *p) { call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); } |
4b6c2cca6 [PATCH] rcu: add ... |
600 601 602 603 604 605 |
static void sched_torture_synchronize(void) { synchronize_sched(); } static struct rcu_torture_ops sched_ops = { |
0acc512cb rcu: Add synchron... |
606 607 608 609 610 |
.init = rcu_sync_torture_init, .cleanup = NULL, .readlock = sched_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, |
d9a3da069 rcu: Add expedite... |
611 |
.completed = rcu_no_completed, |
0acc512cb rcu: Add synchron... |
612 613 614 |
.deferred_free = rcu_sched_torture_deferred_free, .sync = sched_torture_synchronize, .cb_barrier = rcu_barrier_sched, |
bf66f18e7 rcu: Add force_qu... |
615 |
.fqs = rcu_sched_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
616 617 618 |
.stats = NULL, .irq_capable = 1, .name = "sched" |
4b6c2cca6 [PATCH] rcu: add ... |
619 |
}; |
804bb8370 rcu: Add synchron... |
620 |
static struct rcu_torture_ops sched_sync_ops = { |
0acc512cb rcu: Add synchron... |
621 622 623 624 625 |
.init = rcu_sync_torture_init, .cleanup = NULL, .readlock = sched_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, |
d9a3da069 rcu: Add expedite... |
626 |
.completed = rcu_no_completed, |
0acc512cb rcu: Add synchron... |
627 628 629 |
.deferred_free = rcu_sync_torture_deferred_free, .sync = sched_torture_synchronize, .cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
630 |
.fqs = rcu_sched_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
631 632 633 |
.stats = NULL, .name = "sched_sync" }; |
0acc512cb rcu: Add synchron... |
634 635 636 637 638 639 |
static struct rcu_torture_ops sched_expedited_ops = { .init = rcu_sync_torture_init, .cleanup = NULL, .readlock = sched_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, |
d9a3da069 rcu: Add expedite... |
640 |
.completed = rcu_no_completed, |
0acc512cb rcu: Add synchron... |
641 642 643 |
.deferred_free = rcu_sync_torture_deferred_free, .sync = synchronize_sched_expedited, .cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
644 |
.fqs = rcu_sched_force_quiescent_state, |
969c79215 sched: replace mi... |
645 |
.stats = NULL, |
0acc512cb rcu: Add synchron... |
646 647 |
.irq_capable = 1, .name = "sched_expedited" |
2326974df rcu: add call_rcu... |
648 |
}; |
72e9bb549 [PATCH] rcutortur... |
649 |
/* |
bf66f18e7 rcu: Add force_qu... |
650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 |
* RCU torture force-quiescent-state kthread. Repeatedly induces * bursts of calls to force_quiescent_state(), increasing the probability * of occurrence of some important types of race conditions. */ static int rcu_torture_fqs(void *arg) { unsigned long fqs_resume_time; int fqs_burst_remaining; VERBOSE_PRINTK_STRING("rcu_torture_fqs task started"); do { fqs_resume_time = jiffies + fqs_stutter * HZ; while (jiffies - fqs_resume_time > LONG_MAX) { schedule_timeout_interruptible(1); } fqs_burst_remaining = fqs_duration; while (fqs_burst_remaining > 0) { cur_ops->fqs(); udelay(fqs_holdoff); fqs_burst_remaining -= fqs_holdoff; } rcu_stutter_wait("rcu_torture_fqs"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); VERBOSE_PRINTK_STRING("rcu_torture_fqs task stopping"); rcutorture_shutdown_absorb("rcu_torture_fqs"); while (!kthread_should_stop()) schedule_timeout_uninterruptible(1); return 0; } /* |
a241ec65a [PATCH] RCU tortu... |
682 683 684 685 686 687 688 689 690 691 692 693 694 695 |
* RCU torture writer kthread. Repeatedly substitutes a new structure * for that pointed to by rcu_torture_current, freeing the old structure * after a series of grace periods (the "pipeline"). */ static int rcu_torture_writer(void *arg) { int i; long oldbatch = rcu_batches_completed(); struct rcu_torture *rp; struct rcu_torture *old_rp; static DEFINE_RCU_RANDOM(rand); VERBOSE_PRINTK_STRING("rcu_torture_writer task started"); |
dbdf65b1b [PATCH] rcutortur... |
696 |
set_user_nice(current, 19); |
a241ec65a [PATCH] RCU tortu... |
697 698 |
do { schedule_timeout_uninterruptible(1); |
a71fca58b rcu: Fix whitespa... |
699 700 |
rp = rcu_torture_alloc(); if (rp == NULL) |
a241ec65a [PATCH] RCU tortu... |
701 702 703 704 |
continue; rp->rtort_pipe_count = 0; udelay(rcu_random(&rand) & 0x3ff); old_rp = rcu_torture_current; |
996417d2c [PATCH] add succe... |
705 |
rp->rtort_mbtest = 1; |
a241ec65a [PATCH] RCU tortu... |
706 |
rcu_assign_pointer(rcu_torture_current, rp); |
9b2619aff rcu: Clean up cod... |
707 |
smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b1631 rcutorture: style... |
708 |
if (old_rp) { |
a241ec65a [PATCH] RCU tortu... |
709 710 711 712 713 |
i = old_rp->rtort_pipe_count; if (i > RCU_TORTURE_PIPE_LEN) i = RCU_TORTURE_PIPE_LEN; atomic_inc(&rcu_torture_wcount[i]); old_rp->rtort_pipe_count++; |
0acc512cb rcu: Add synchron... |
714 |
cur_ops->deferred_free(old_rp); |
a241ec65a [PATCH] RCU tortu... |
715 716 |
} rcu_torture_current_version++; |
72e9bb549 [PATCH] rcutortur... |
717 |
oldbatch = cur_ops->completed(); |
c9d557c19 rcu: fix bug in r... |
718 719 |
rcu_stutter_wait("rcu_torture_writer"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
a241ec65a [PATCH] RCU tortu... |
720 |
VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); |
c9d557c19 rcu: fix bug in r... |
721 722 |
rcutorture_shutdown_absorb("rcu_torture_writer"); while (!kthread_should_stop()) |
a241ec65a [PATCH] RCU tortu... |
723 724 725 726 727 |
schedule_timeout_uninterruptible(1); return 0; } /* |
b772e1dd4 [PATCH] RCU: add ... |
728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 |
* RCU torture fake writer kthread. Repeatedly calls sync, with a random * delay between calls. */ static int rcu_torture_fakewriter(void *arg) { DEFINE_RCU_RANDOM(rand); VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); set_user_nice(current, 19); do { schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); udelay(rcu_random(&rand) & 0x3ff); cur_ops->sync(); |
c9d557c19 rcu: fix bug in r... |
743 744 |
rcu_stutter_wait("rcu_torture_fakewriter"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
b772e1dd4 [PATCH] RCU: add ... |
745 746 |
VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); |
c9d557c19 rcu: fix bug in r... |
747 748 |
rcutorture_shutdown_absorb("rcu_torture_fakewriter"); while (!kthread_should_stop()) |
b772e1dd4 [PATCH] RCU: add ... |
749 750 751 752 753 |
schedule_timeout_uninterruptible(1); return 0; } /* |
0729fbf3b rcu: make rcutort... |
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 |
* RCU torture reader from timer handler. Dereferences rcu_torture_current, * incrementing the corresponding element of the pipeline array. The * counter in the element should never be greater than 1, otherwise, the * RCU implementation is broken. */ static void rcu_torture_timer(unsigned long unused) { int idx; int completed; static DEFINE_RCU_RANDOM(rand); static DEFINE_SPINLOCK(rand_lock); struct rcu_torture *p; int pipe_count; idx = cur_ops->readlock(); completed = cur_ops->completed(); |
632ee2001 rcu: Introduce lo... |
770 771 772 773 774 |
p = rcu_dereference_check(rcu_torture_current, rcu_read_lock_held() || rcu_read_lock_bh_held() || rcu_read_lock_sched_held() || srcu_read_lock_held(&srcu_ctl)); |
0729fbf3b rcu: make rcutort... |
775 776 777 778 779 780 781 782 |
if (p == NULL) { /* Leave because rcu_torture_writer is not yet underway */ cur_ops->readunlock(idx); return; } if (p->rtort_mbtest == 0) atomic_inc(&n_rcu_torture_mberror); spin_lock(&rand_lock); |
0acc512cb rcu: Add synchron... |
783 |
cur_ops->read_delay(&rand); |
0729fbf3b rcu: make rcutort... |
784 785 786 787 788 789 790 791 |
n_rcu_torture_timers++; spin_unlock(&rand_lock); preempt_disable(); pipe_count = p->rtort_pipe_count; if (pipe_count > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ pipe_count = RCU_TORTURE_PIPE_LEN; } |
dd17c8f72 percpu: remove pe... |
792 |
__this_cpu_inc(rcu_torture_count[pipe_count]); |
0729fbf3b rcu: make rcutort... |
793 794 795 796 797 |
completed = cur_ops->completed() - completed; if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } |
dd17c8f72 percpu: remove pe... |
798 |
__this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3b rcu: make rcutort... |
799 800 801 802 803 |
preempt_enable(); cur_ops->readunlock(idx); } /* |
a241ec65a [PATCH] RCU tortu... |
804 805 806 807 808 809 810 811 812 |
* RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, * incrementing the corresponding element of the pipeline array. The * counter in the element should never be greater than 1, otherwise, the * RCU implementation is broken. */ static int rcu_torture_reader(void *arg) { int completed; |
72e9bb549 [PATCH] rcutortur... |
813 |
int idx; |
a241ec65a [PATCH] RCU tortu... |
814 815 816 |
DEFINE_RCU_RANDOM(rand); struct rcu_torture *p; int pipe_count; |
0729fbf3b rcu: make rcutort... |
817 |
struct timer_list t; |
a241ec65a [PATCH] RCU tortu... |
818 819 |
VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); |
dbdf65b1b [PATCH] rcutortur... |
820 |
set_user_nice(current, 19); |
0acc512cb rcu: Add synchron... |
821 |
if (irqreader && cur_ops->irq_capable) |
0729fbf3b rcu: make rcutort... |
822 |
setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1b [PATCH] rcutortur... |
823 |
|
a241ec65a [PATCH] RCU tortu... |
824 |
do { |
0acc512cb rcu: Add synchron... |
825 |
if (irqreader && cur_ops->irq_capable) { |
0729fbf3b rcu: make rcutort... |
826 |
if (!timer_pending(&t)) |
6155fec92 rcu: Fix rcutortu... |
827 |
mod_timer(&t, jiffies + 1); |
0729fbf3b rcu: make rcutort... |
828 |
} |
72e9bb549 [PATCH] rcutortur... |
829 830 |
idx = cur_ops->readlock(); completed = cur_ops->completed(); |
632ee2001 rcu: Introduce lo... |
831 832 833 834 835 |
p = rcu_dereference_check(rcu_torture_current, rcu_read_lock_held() || rcu_read_lock_bh_held() || rcu_read_lock_sched_held() || srcu_read_lock_held(&srcu_ctl)); |
a241ec65a [PATCH] RCU tortu... |
836 837 |
if (p == NULL) { /* Wait for rcu_torture_writer to get underway */ |
72e9bb549 [PATCH] rcutortur... |
838 |
cur_ops->readunlock(idx); |
a241ec65a [PATCH] RCU tortu... |
839 840 841 |
schedule_timeout_interruptible(HZ); continue; } |
996417d2c [PATCH] add succe... |
842 843 |
if (p->rtort_mbtest == 0) atomic_inc(&n_rcu_torture_mberror); |
0acc512cb rcu: Add synchron... |
844 |
cur_ops->read_delay(&rand); |
a241ec65a [PATCH] RCU tortu... |
845 846 847 848 849 850 |
preempt_disable(); pipe_count = p->rtort_pipe_count; if (pipe_count > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ pipe_count = RCU_TORTURE_PIPE_LEN; } |
dd17c8f72 percpu: remove pe... |
851 |
__this_cpu_inc(rcu_torture_count[pipe_count]); |
72e9bb549 [PATCH] rcutortur... |
852 |
completed = cur_ops->completed() - completed; |
a241ec65a [PATCH] RCU tortu... |
853 854 855 856 |
if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } |
dd17c8f72 percpu: remove pe... |
857 |
__this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65a [PATCH] RCU tortu... |
858 |
preempt_enable(); |
72e9bb549 [PATCH] rcutortur... |
859 |
cur_ops->readunlock(idx); |
a241ec65a [PATCH] RCU tortu... |
860 |
schedule(); |
c9d557c19 rcu: fix bug in r... |
861 862 |
rcu_stutter_wait("rcu_torture_reader"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
a241ec65a [PATCH] RCU tortu... |
863 |
VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); |
c9d557c19 rcu: fix bug in r... |
864 |
rcutorture_shutdown_absorb("rcu_torture_reader"); |
0acc512cb rcu: Add synchron... |
865 |
if (irqreader && cur_ops->irq_capable) |
0729fbf3b rcu: make rcutort... |
866 |
del_timer_sync(&t); |
c9d557c19 rcu: fix bug in r... |
867 |
while (!kthread_should_stop()) |
a241ec65a [PATCH] RCU tortu... |
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 |
schedule_timeout_uninterruptible(1); return 0; } /* * Create an RCU-torture statistics message in the specified buffer. */ static int rcu_torture_printk(char *page) { int cnt = 0; int cpu; int i; long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; |
0a9450227 [PATCH] for_each_... |
883 |
for_each_possible_cpu(cpu) { |
a241ec65a [PATCH] RCU tortu... |
884 885 886 887 888 889 890 891 892 |
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; } } for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { if (pipesummary[i] != 0) break; } |
72e9bb549 [PATCH] rcutortur... |
893 |
cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
894 |
cnt += sprintf(&page[cnt], |
996417d2c [PATCH] add succe... |
895 |
"rtc: %p ver: %ld tfle: %d rta: %d rtaf: %d rtf: %d " |
0729fbf3b rcu: make rcutort... |
896 |
"rtmbe: %d nt: %ld", |
a241ec65a [PATCH] RCU tortu... |
897 898 899 900 901 |
rcu_torture_current, rcu_torture_current_version, list_empty(&rcu_torture_freelist), atomic_read(&n_rcu_torture_alloc), atomic_read(&n_rcu_torture_alloc_fail), |
996417d2c [PATCH] add succe... |
902 |
atomic_read(&n_rcu_torture_free), |
0729fbf3b rcu: make rcutort... |
903 904 |
atomic_read(&n_rcu_torture_mberror), n_rcu_torture_timers); |
996417d2c [PATCH] add succe... |
905 906 |
if (atomic_read(&n_rcu_torture_mberror) != 0) cnt += sprintf(&page[cnt], " !!!"); |
72e9bb549 [PATCH] rcutortur... |
907 908 |
cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
996417d2c [PATCH] add succe... |
909 |
if (i > 1) { |
a241ec65a [PATCH] RCU tortu... |
910 |
cnt += sprintf(&page[cnt], "!!! "); |
996417d2c [PATCH] add succe... |
911 |
atomic_inc(&n_rcu_torture_error); |
5af970a48 rcutorture: WARN_... |
912 |
WARN_ON_ONCE(1); |
996417d2c [PATCH] add succe... |
913 |
} |
a241ec65a [PATCH] RCU tortu... |
914 915 916 |
cnt += sprintf(&page[cnt], "Reader Pipe: "); for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) cnt += sprintf(&page[cnt], " %ld", pipesummary[i]); |
72e9bb549 [PATCH] rcutortur... |
917 918 |
cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
919 |
cnt += sprintf(&page[cnt], "Reader Batch: "); |
72e9bb549 [PATCH] rcutortur... |
920 |
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
a241ec65a [PATCH] RCU tortu... |
921 |
cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); |
72e9bb549 [PATCH] rcutortur... |
922 923 |
cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
924 925 926 927 928 929 930 |
cnt += sprintf(&page[cnt], "Free-Block Circulation: "); for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { cnt += sprintf(&page[cnt], " %d", atomic_read(&rcu_torture_wcount[i])); } cnt += sprintf(&page[cnt], " "); |
c8e5b1631 rcutorture: style... |
931 |
if (cur_ops->stats) |
72e9bb549 [PATCH] rcutortur... |
932 |
cnt += cur_ops->stats(&page[cnt]); |
a241ec65a [PATCH] RCU tortu... |
933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 |
return cnt; } /* * Print torture statistics. Caller must ensure that there is only * one call to this function at a given time!!! This is normally * accomplished by relying on the module system to only have one copy * of the module loaded, and then by giving the rcu_torture_stats * kthread full control (or the init/cleanup functions when rcu_torture_stats * thread is not running). */ static void rcu_torture_stats_print(void) { int cnt; cnt = rcu_torture_printk(printk_buf); printk(KERN_ALERT "%s", printk_buf); } /* * Periodically prints torture statistics, if periodic statistics printing * was specified via the stat_interval module parameter. * * No need to worry about fullstop here, since this one doesn't reference * volatile state or register callbacks. */ static int rcu_torture_stats(void *arg) { VERBOSE_PRINTK_STRING("rcu_torture_stats task started"); do { schedule_timeout_interruptible(stat_interval * HZ); rcu_torture_stats_print(); |
c9d557c19 rcu: fix bug in r... |
967 968 |
rcutorture_shutdown_absorb("rcu_torture_stats"); } while (!kthread_should_stop()); |
a241ec65a [PATCH] RCU tortu... |
969 970 971 |
VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); return 0; } |
d84f52034 [PATCH] Extend RC... |
972 973 974 975 976 |
static int rcu_idle_cpu; /* Force all torture tasks off this CPU */ /* Shuffle tasks such that we allow @rcu_idle_cpu to become idle. A special case * is when @rcu_idle_cpu = -1, when we allow the tasks to run on all CPUs. */ |
b2896d2e7 [PATCH] srcu-3: a... |
977 |
static void rcu_torture_shuffle_tasks(void) |
d84f52034 [PATCH] Extend RC... |
978 |
{ |
d84f52034 [PATCH] Extend RC... |
979 |
int i; |
73d0a4b10 cpumask: convert ... |
980 |
cpumask_setall(shuffle_tmp_mask); |
86ef5c9a8 cpu-hotplug: repl... |
981 |
get_online_cpus(); |
d84f52034 [PATCH] Extend RC... |
982 983 |
/* No point in shuffling if there is only one online CPU (ex: UP) */ |
c9d557c19 rcu: fix bug in r... |
984 985 986 987 |
if (num_online_cpus() == 1) { put_online_cpus(); return; } |
d84f52034 [PATCH] Extend RC... |
988 989 |
if (rcu_idle_cpu != -1) |
73d0a4b10 cpumask: convert ... |
990 |
cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
991 |
|
73d0a4b10 cpumask: convert ... |
992 |
set_cpus_allowed_ptr(current, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
993 |
|
c8e5b1631 rcutorture: style... |
994 |
if (reader_tasks) { |
d84f52034 [PATCH] Extend RC... |
995 996 |
for (i = 0; i < nrealreaders; i++) if (reader_tasks[i]) |
f70316dac generic: use new ... |
997 |
set_cpus_allowed_ptr(reader_tasks[i], |
73d0a4b10 cpumask: convert ... |
998 |
shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
999 |
} |
c8e5b1631 rcutorture: style... |
1000 |
if (fakewriter_tasks) { |
b772e1dd4 [PATCH] RCU: add ... |
1001 1002 |
for (i = 0; i < nfakewriters; i++) if (fakewriter_tasks[i]) |
f70316dac generic: use new ... |
1003 |
set_cpus_allowed_ptr(fakewriter_tasks[i], |
73d0a4b10 cpumask: convert ... |
1004 |
shuffle_tmp_mask); |
b772e1dd4 [PATCH] RCU: add ... |
1005 |
} |
d84f52034 [PATCH] Extend RC... |
1006 |
if (writer_task) |
73d0a4b10 cpumask: convert ... |
1007 |
set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1008 1009 |
if (stats_task) |
73d0a4b10 cpumask: convert ... |
1010 |
set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1011 1012 1013 1014 1015 |
if (rcu_idle_cpu == -1) rcu_idle_cpu = num_online_cpus() - 1; else rcu_idle_cpu--; |
86ef5c9a8 cpu-hotplug: repl... |
1016 |
put_online_cpus(); |
d84f52034 [PATCH] Extend RC... |
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 |
} /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the * system to become idle at a time and cut off its timer ticks. This is meant * to test the support for such tickless idle CPU in RCU. */ static int rcu_torture_shuffle(void *arg) { VERBOSE_PRINTK_STRING("rcu_torture_shuffle task started"); do { schedule_timeout_interruptible(shuffle_interval * HZ); rcu_torture_shuffle_tasks(); |
c9d557c19 rcu: fix bug in r... |
1030 1031 |
rcutorture_shutdown_absorb("rcu_torture_shuffle"); } while (!kthread_should_stop()); |
d84f52034 [PATCH] Extend RC... |
1032 1033 1034 |
VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); return 0; } |
d120f65f3 rcu: make rcutort... |
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 |
/* Cause the rcutorture test to "stutter", starting and stopping all * threads periodically. */ static int rcu_torture_stutter(void *arg) { VERBOSE_PRINTK_STRING("rcu_torture_stutter task started"); do { schedule_timeout_interruptible(stutter * HZ); stutter_pause_test = 1; |
c9d557c19 rcu: fix bug in r... |
1045 |
if (!kthread_should_stop()) |
d120f65f3 rcu: make rcutort... |
1046 1047 |
schedule_timeout_interruptible(stutter * HZ); stutter_pause_test = 0; |
c9d557c19 rcu: fix bug in r... |
1048 1049 |
rcutorture_shutdown_absorb("rcu_torture_stutter"); } while (!kthread_should_stop()); |
d120f65f3 rcu: make rcutort... |
1050 1051 1052 |
VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); return 0; } |
95c383227 [PATCH] rcutortur... |
1053 1054 1055 |
static inline void rcu_torture_print_module_parms(char *tag) { |
b772e1dd4 [PATCH] RCU: add ... |
1056 1057 |
printk(KERN_ALERT "%s" TORTURE_FLAG "--- %s: nreaders=%d nfakewriters=%d " |
95c383227 [PATCH] rcutortur... |
1058 |
"stat_interval=%d verbose=%d test_no_idle_hz=%d " |
bf66f18e7 rcu: Add force_qu... |
1059 1060 1061 |
"shuffle_interval=%d stutter=%d irqreader=%d " "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d ", |
b772e1dd4 [PATCH] RCU: add ... |
1062 |
torture_type, tag, nrealreaders, nfakewriters, |
d120f65f3 rcu: make rcutort... |
1063 |
stat_interval, verbose, test_no_idle_hz, shuffle_interval, |
bf66f18e7 rcu: Add force_qu... |
1064 |
stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter); |
95c383227 [PATCH] rcutortur... |
1065 |
} |
343e9099c rcu: fix rcutortu... |
1066 1067 1068 |
static struct notifier_block rcutorture_nb = { .notifier_call = rcutorture_shutdown_notify, }; |
a241ec65a [PATCH] RCU tortu... |
1069 1070 1071 1072 |
static void rcu_torture_cleanup(void) { int i; |
343e9099c rcu: fix rcutortu... |
1073 |
mutex_lock(&fullstop_mutex); |
c9d557c19 rcu: fix bug in r... |
1074 1075 1076 1077 |
if (fullstop == FULLSTOP_SHUTDOWN) { printk(KERN_WARNING /* but going down anyway, so... */ "Concurrent 'rmmod rcutorture' and shutdown illegal! "); |
343e9099c rcu: fix rcutortu... |
1078 |
mutex_unlock(&fullstop_mutex); |
c9d557c19 rcu: fix bug in r... |
1079 |
schedule_timeout_uninterruptible(10); |
343e9099c rcu: fix rcutortu... |
1080 1081 1082 1083 |
if (cur_ops->cb_barrier != NULL) cur_ops->cb_barrier(); return; } |
c9d557c19 rcu: fix bug in r... |
1084 |
fullstop = FULLSTOP_RMMOD; |
343e9099c rcu: fix rcutortu... |
1085 1086 |
mutex_unlock(&fullstop_mutex); unregister_reboot_notifier(&rcutorture_nb); |
d120f65f3 rcu: make rcutort... |
1087 1088 1089 1090 1091 |
if (stutter_task) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); kthread_stop(stutter_task); } stutter_task = NULL; |
c8e5b1631 rcutorture: style... |
1092 |
if (shuffler_task) { |
d84f52034 [PATCH] Extend RC... |
1093 1094 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); kthread_stop(shuffler_task); |
73d0a4b10 cpumask: convert ... |
1095 |
free_cpumask_var(shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1096 1097 |
} shuffler_task = NULL; |
c8e5b1631 rcutorture: style... |
1098 |
if (writer_task) { |
a241ec65a [PATCH] RCU tortu... |
1099 1100 1101 1102 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); kthread_stop(writer_task); } writer_task = NULL; |
c8e5b1631 rcutorture: style... |
1103 |
if (reader_tasks) { |
a241ec65a [PATCH] RCU tortu... |
1104 |
for (i = 0; i < nrealreaders; i++) { |
c8e5b1631 rcutorture: style... |
1105 |
if (reader_tasks[i]) { |
a241ec65a [PATCH] RCU tortu... |
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 |
VERBOSE_PRINTK_STRING( "Stopping rcu_torture_reader task"); kthread_stop(reader_tasks[i]); } reader_tasks[i] = NULL; } kfree(reader_tasks); reader_tasks = NULL; } rcu_torture_current = NULL; |
c8e5b1631 rcutorture: style... |
1116 |
if (fakewriter_tasks) { |
b772e1dd4 [PATCH] RCU: add ... |
1117 |
for (i = 0; i < nfakewriters; i++) { |
c8e5b1631 rcutorture: style... |
1118 |
if (fakewriter_tasks[i]) { |
b772e1dd4 [PATCH] RCU: add ... |
1119 1120 1121 1122 1123 1124 1125 1126 1127 |
VERBOSE_PRINTK_STRING( "Stopping rcu_torture_fakewriter task"); kthread_stop(fakewriter_tasks[i]); } fakewriter_tasks[i] = NULL; } kfree(fakewriter_tasks); fakewriter_tasks = NULL; } |
c8e5b1631 rcutorture: style... |
1128 |
if (stats_task) { |
a241ec65a [PATCH] RCU tortu... |
1129 1130 1131 1132 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); kthread_stop(stats_task); } stats_task = NULL; |
bf66f18e7 rcu: Add force_qu... |
1133 1134 1135 1136 1137 |
if (fqs_task) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_fqs task"); kthread_stop(fqs_task); } fqs_task = NULL; |
a241ec65a [PATCH] RCU tortu... |
1138 |
/* Wait for all RCU callbacks to fire. */ |
2326974df rcu: add call_rcu... |
1139 1140 1141 |
if (cur_ops->cb_barrier != NULL) cur_ops->cb_barrier(); |
a241ec65a [PATCH] RCU tortu... |
1142 |
|
a241ec65a [PATCH] RCU tortu... |
1143 |
rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb549 [PATCH] rcutortur... |
1144 |
|
c8e5b1631 rcutorture: style... |
1145 |
if (cur_ops->cleanup) |
72e9bb549 [PATCH] rcutortur... |
1146 |
cur_ops->cleanup(); |
95c383227 [PATCH] rcutortur... |
1147 1148 1149 1150 |
if (atomic_read(&n_rcu_torture_error)) rcu_torture_print_module_parms("End of test: FAILURE"); else rcu_torture_print_module_parms("End of test: SUCCESS"); |
a241ec65a [PATCH] RCU tortu... |
1151 |
} |
6f8bc500a rcutorture: Mark ... |
1152 |
static int __init |
a241ec65a [PATCH] RCU tortu... |
1153 1154 1155 1156 1157 |
rcu_torture_init(void) { int i; int cpu; int firsterr = 0; |
ade5fb818 rcutorture: Remov... |
1158 |
static struct rcu_torture_ops *torture_ops[] = |
d9a3da069 rcu: Add expedite... |
1159 1160 |
{ &rcu_ops, &rcu_sync_ops, &rcu_expedited_ops, &rcu_bh_ops, &rcu_bh_sync_ops, |
804bb8370 rcu: Add synchron... |
1161 1162 |
&srcu_ops, &srcu_expedited_ops, &sched_ops, &sched_sync_ops, &sched_expedited_ops, }; |
a241ec65a [PATCH] RCU tortu... |
1163 |
|
343e9099c rcu: fix rcutortu... |
1164 |
mutex_lock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
1165 |
/* Process args and tell the world that the torturer is on the job. */ |
ade5fb818 rcutorture: Remov... |
1166 |
for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb549 [PATCH] rcutortur... |
1167 |
cur_ops = torture_ops[i]; |
ade5fb818 rcutorture: Remov... |
1168 |
if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb549 [PATCH] rcutortur... |
1169 |
break; |
72e9bb549 [PATCH] rcutortur... |
1170 |
} |
ade5fb818 rcutorture: Remov... |
1171 |
if (i == ARRAY_SIZE(torture_ops)) { |
cf886c44e rcu: Improve rcut... |
1172 1173 |
printk(KERN_ALERT "rcu-torture: invalid torture type: \"%s\" ", |
72e9bb549 [PATCH] rcutortur... |
1174 |
torture_type); |
cf886c44e rcu: Improve rcut... |
1175 1176 1177 1178 1179 |
printk(KERN_ALERT "rcu-torture types:"); for (i = 0; i < ARRAY_SIZE(torture_ops); i++) printk(KERN_ALERT " %s", torture_ops[i]->name); printk(KERN_ALERT " "); |
343e9099c rcu: fix rcutortu... |
1180 |
mutex_unlock(&fullstop_mutex); |
a71fca58b rcu: Fix whitespa... |
1181 |
return -EINVAL; |
72e9bb549 [PATCH] rcutortur... |
1182 |
} |
bf66f18e7 rcu: Add force_qu... |
1183 1184 1185 1186 1187 1188 |
if (cur_ops->fqs == NULL && fqs_duration != 0) { printk(KERN_ALERT "rcu-torture: ->fqs NULL and non-zero " "fqs_duration, fqs disabled. "); fqs_duration = 0; } |
c8e5b1631 rcutorture: style... |
1189 |
if (cur_ops->init) |
72e9bb549 [PATCH] rcutortur... |
1190 |
cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
a241ec65a [PATCH] RCU tortu... |
1191 1192 1193 1194 |
if (nreaders >= 0) nrealreaders = nreaders; else nrealreaders = 2 * num_online_cpus(); |
95c383227 [PATCH] rcutortur... |
1195 |
rcu_torture_print_module_parms("Start of test"); |
c9d557c19 rcu: fix bug in r... |
1196 |
fullstop = FULLSTOP_DONTSTOP; |
a241ec65a [PATCH] RCU tortu... |
1197 1198 1199 1200 |
/* Set up the freelist. */ INIT_LIST_HEAD(&rcu_torture_freelist); |
788e770eb rcutorture: Use A... |
1201 |
for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2c [PATCH] add succe... |
1202 |
rcu_tortures[i].rtort_mbtest = 0; |
a241ec65a [PATCH] RCU tortu... |
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 |
list_add_tail(&rcu_tortures[i].rtort_free, &rcu_torture_freelist); } /* Initialize the statistics so that each run gets its own numbers. */ rcu_torture_current = NULL; rcu_torture_current_version = 0; atomic_set(&n_rcu_torture_alloc, 0); atomic_set(&n_rcu_torture_alloc_fail, 0); atomic_set(&n_rcu_torture_free, 0); |
996417d2c [PATCH] add succe... |
1214 1215 |
atomic_set(&n_rcu_torture_mberror, 0); atomic_set(&n_rcu_torture_error, 0); |
a241ec65a [PATCH] RCU tortu... |
1216 1217 |
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) atomic_set(&rcu_torture_wcount[i], 0); |
0a9450227 [PATCH] for_each_... |
1218 |
for_each_possible_cpu(cpu) { |
a241ec65a [PATCH] RCU tortu... |
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 |
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { per_cpu(rcu_torture_count, cpu)[i] = 0; per_cpu(rcu_torture_batch, cpu)[i] = 0; } } /* Start up the kthreads. */ VERBOSE_PRINTK_STRING("Creating rcu_torture_writer task"); writer_task = kthread_run(rcu_torture_writer, NULL, "rcu_torture_writer"); if (IS_ERR(writer_task)) { firsterr = PTR_ERR(writer_task); VERBOSE_PRINTK_ERRSTRING("Failed to create writer"); writer_task = NULL; goto unwind; } |
b772e1dd4 [PATCH] RCU: add ... |
1236 |
fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58b rcu: Fix whitespa... |
1237 |
GFP_KERNEL); |
b772e1dd4 [PATCH] RCU: add ... |
1238 1239 1240 1241 1242 1243 1244 1245 |
if (fakewriter_tasks == NULL) { VERBOSE_PRINTK_ERRSTRING("out of memory"); firsterr = -ENOMEM; goto unwind; } for (i = 0; i < nfakewriters; i++) { VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, |
a71fca58b rcu: Fix whitespa... |
1246 |
"rcu_torture_fakewriter"); |
b772e1dd4 [PATCH] RCU: add ... |
1247 1248 1249 1250 1251 1252 1253 |
if (IS_ERR(fakewriter_tasks[i])) { firsterr = PTR_ERR(fakewriter_tasks[i]); VERBOSE_PRINTK_ERRSTRING("Failed to create fakewriter"); fakewriter_tasks[i] = NULL; goto unwind; } } |
2860aaba4 [PATCH] rcu: Avoi... |
1254 |
reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65a [PATCH] RCU tortu... |
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 |
GFP_KERNEL); if (reader_tasks == NULL) { VERBOSE_PRINTK_ERRSTRING("out of memory"); firsterr = -ENOMEM; goto unwind; } for (i = 0; i < nrealreaders; i++) { VERBOSE_PRINTK_STRING("Creating rcu_torture_reader task"); reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, "rcu_torture_reader"); if (IS_ERR(reader_tasks[i])) { firsterr = PTR_ERR(reader_tasks[i]); VERBOSE_PRINTK_ERRSTRING("Failed to create reader"); reader_tasks[i] = NULL; goto unwind; } } if (stat_interval > 0) { VERBOSE_PRINTK_STRING("Creating rcu_torture_stats task"); stats_task = kthread_run(rcu_torture_stats, NULL, "rcu_torture_stats"); if (IS_ERR(stats_task)) { firsterr = PTR_ERR(stats_task); VERBOSE_PRINTK_ERRSTRING("Failed to create stats"); stats_task = NULL; goto unwind; } } |
d84f52034 [PATCH] Extend RC... |
1283 1284 |
if (test_no_idle_hz) { rcu_idle_cpu = num_online_cpus() - 1; |
73d0a4b10 cpumask: convert ... |
1285 1286 1287 1288 1289 1290 |
if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { firsterr = -ENOMEM; VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask"); goto unwind; } |
d84f52034 [PATCH] Extend RC... |
1291 1292 1293 1294 |
/* Create the shuffler thread */ shuffler_task = kthread_run(rcu_torture_shuffle, NULL, "rcu_torture_shuffle"); if (IS_ERR(shuffler_task)) { |
73d0a4b10 cpumask: convert ... |
1295 |
free_cpumask_var(shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1296 1297 1298 1299 1300 1301 |
firsterr = PTR_ERR(shuffler_task); VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); shuffler_task = NULL; goto unwind; } } |
d120f65f3 rcu: make rcutort... |
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 |
if (stutter < 0) stutter = 0; if (stutter) { /* Create the stutter thread */ stutter_task = kthread_run(rcu_torture_stutter, NULL, "rcu_torture_stutter"); if (IS_ERR(stutter_task)) { firsterr = PTR_ERR(stutter_task); VERBOSE_PRINTK_ERRSTRING("Failed to create stutter"); stutter_task = NULL; goto unwind; } } |
bf66f18e7 rcu: Add force_qu... |
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 |
if (fqs_duration < 0) fqs_duration = 0; if (fqs_duration) { /* Create the stutter thread */ fqs_task = kthread_run(rcu_torture_fqs, NULL, "rcu_torture_fqs"); if (IS_ERR(fqs_task)) { firsterr = PTR_ERR(fqs_task); VERBOSE_PRINTK_ERRSTRING("Failed to create fqs"); fqs_task = NULL; goto unwind; } } |
343e9099c rcu: fix rcutortu... |
1328 1329 |
register_reboot_notifier(&rcutorture_nb); mutex_unlock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
1330 1331 1332 |
return 0; unwind: |
343e9099c rcu: fix rcutortu... |
1333 |
mutex_unlock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
1334 1335 1336 1337 1338 1339 |
rcu_torture_cleanup(); return firsterr; } module_init(rcu_torture_init); module_exit(rcu_torture_cleanup); |