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kernel/rcutorture.c
33.8 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 " "Josh Triplett <josh@freedesktop.org>"); |
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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 char *torture_type = "rcu"; /* What RCU implementation to torture. */ |
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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(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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#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); static struct rcu_torture *rcu_torture_current = NULL; static long rcu_torture_current_version = 0; 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 = 0; |
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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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static int stutter_pause_test = 0; |
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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)cpu_clock(raw_smp_processor_id()); |
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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 (*readdelay)(struct rcu_random_state *rrsp); |
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void (*readunlock)(int idx); int (*completed)(void); void (*deferredfree)(struct rcu_torture *p); |
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void (*sync)(void); |
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void (*cb_barrier)(void); |
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int (*stats)(char *page); |
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int irqcapable; |
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char *name; }; static struct rcu_torture_ops *cur_ops = NULL; /* * 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) { long delay; const long longdelay = 200; /* We want there to be long-running readers, but not all the time. */ delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay); if (!delay) udelay(longdelay); } |
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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 cur_ops->deferredfree(rp); } 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 = { .init = NULL, .cleanup = NULL, .readlock = rcu_torture_read_lock, |
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.readdelay = rcu_read_delay, |
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.readunlock = rcu_torture_read_unlock, .completed = rcu_torture_completed, .deferredfree = rcu_torture_deferred_free, |
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.sync = synchronize_rcu, |
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.cb_barrier = rcu_barrier, |
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.stats = NULL, |
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.irqcapable = 1, |
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.name = "rcu" }; |
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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 = { .init = rcu_sync_torture_init, .cleanup = NULL, .readlock = rcu_torture_read_lock, .readdelay = rcu_read_delay, .readunlock = rcu_torture_read_unlock, .completed = rcu_torture_completed, .deferredfree = rcu_sync_torture_deferred_free, .sync = synchronize_rcu, |
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.cb_barrier = NULL, |
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.stats = NULL, |
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.irqcapable = 1, |
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.name = "rcu_sync" }; |
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/* * Definitions for rcu_bh torture testing. */ |
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static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
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{ rcu_read_lock_bh(); return 0; } |
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static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
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{ 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); } |
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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; init_completion(&rcu.completion); call_rcu_bh(&rcu.head, rcu_bh_torture_wakeme_after_cb); wait_for_completion(&rcu.completion); } |
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static struct rcu_torture_ops rcu_bh_ops = { .init = NULL, .cleanup = NULL, .readlock = rcu_bh_torture_read_lock, |
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.readdelay = rcu_read_delay, /* just reuse rcu's version. */ |
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.readunlock = rcu_bh_torture_read_unlock, .completed = rcu_bh_torture_completed, .deferredfree = rcu_bh_torture_deferred_free, |
b772e1dd4 [PATCH] RCU: add ... |
428 |
.sync = rcu_bh_torture_synchronize, |
2326974df rcu: add call_rcu... |
429 |
.cb_barrier = rcu_barrier_bh, |
c32e06605 [PATCH] rcutortur... |
430 |
.stats = NULL, |
0729fbf3b rcu: make rcutort... |
431 |
.irqcapable = 1, |
c32e06605 [PATCH] rcutortur... |
432 433 |
.name = "rcu_bh" }; |
11a147013 [PATCH] rcu: add ... |
434 435 436 437 438 439 440 441 442 |
static struct rcu_torture_ops rcu_bh_sync_ops = { .init = rcu_sync_torture_init, .cleanup = NULL, .readlock = rcu_bh_torture_read_lock, .readdelay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = rcu_bh_torture_read_unlock, .completed = rcu_bh_torture_completed, .deferredfree = rcu_sync_torture_deferred_free, .sync = rcu_bh_torture_synchronize, |
2326974df rcu: add call_rcu... |
443 |
.cb_barrier = NULL, |
11a147013 [PATCH] rcu: add ... |
444 |
.stats = NULL, |
0729fbf3b rcu: make rcutort... |
445 |
.irqcapable = 1, |
11a147013 [PATCH] rcu: add ... |
446 447 |
.name = "rcu_bh_sync" }; |
b2896d2e7 [PATCH] srcu-3: a... |
448 449 450 451 452 |
/* * Definitions for srcu torture testing. */ static struct srcu_struct srcu_ctl; |
b2896d2e7 [PATCH] srcu-3: a... |
453 454 455 456 |
static void srcu_torture_init(void) { init_srcu_struct(&srcu_ctl); |
e30337365 [PATCH] rcu: refa... |
457 |
rcu_sync_torture_init(); |
b2896d2e7 [PATCH] srcu-3: a... |
458 459 460 461 462 463 464 |
} static void srcu_torture_cleanup(void) { synchronize_srcu(&srcu_ctl); cleanup_srcu_struct(&srcu_ctl); } |
012d3ca8d [PATCH] Add Spars... |
465 |
static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e7 [PATCH] srcu-3: a... |
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 |
{ 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... |
482 |
static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e7 [PATCH] srcu-3: a... |
483 484 485 486 487 488 489 490 |
{ srcu_read_unlock(&srcu_ctl, idx); } static int srcu_torture_completed(void) { return srcu_batches_completed(&srcu_ctl); } |
b772e1dd4 [PATCH] RCU: add ... |
491 492 493 494 |
static void srcu_torture_synchronize(void) { synchronize_srcu(&srcu_ctl); } |
b2896d2e7 [PATCH] srcu-3: a... |
495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 |
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 = { .init = srcu_torture_init, .cleanup = srcu_torture_cleanup, .readlock = srcu_torture_read_lock, .readdelay = srcu_read_delay, .readunlock = srcu_torture_read_unlock, .completed = srcu_torture_completed, |
e30337365 [PATCH] rcu: refa... |
520 |
.deferredfree = rcu_sync_torture_deferred_free, |
b772e1dd4 [PATCH] RCU: add ... |
521 |
.sync = srcu_torture_synchronize, |
2326974df rcu: add call_rcu... |
522 |
.cb_barrier = NULL, |
b2896d2e7 [PATCH] srcu-3: a... |
523 524 525 |
.stats = srcu_torture_stats, .name = "srcu" }; |
4b6c2cca6 [PATCH] rcu: add ... |
526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 |
/* * 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(); } static int sched_torture_completed(void) { return 0; } |
2326974df rcu: add call_rcu... |
545 546 547 548 |
static void rcu_sched_torture_deferred_free(struct rcu_torture *p) { call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); } |
4b6c2cca6 [PATCH] rcu: add ... |
549 550 551 552 553 554 555 556 557 558 559 560 |
static void sched_torture_synchronize(void) { synchronize_sched(); } static struct rcu_torture_ops sched_ops = { .init = rcu_sync_torture_init, .cleanup = NULL, .readlock = sched_torture_read_lock, .readdelay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, .completed = sched_torture_completed, |
2326974df rcu: add call_rcu... |
561 |
.deferredfree = rcu_sched_torture_deferred_free, |
4b6c2cca6 [PATCH] rcu: add ... |
562 |
.sync = sched_torture_synchronize, |
2326974df rcu: add call_rcu... |
563 |
.cb_barrier = rcu_barrier_sched, |
4b6c2cca6 [PATCH] rcu: add ... |
564 |
.stats = NULL, |
0729fbf3b rcu: make rcutort... |
565 |
.irqcapable = 1, |
4b6c2cca6 [PATCH] rcu: add ... |
566 567 |
.name = "sched" }; |
2326974df rcu: add call_rcu... |
568 569 570 571 572 573 574 575 576 577 578 579 580 |
static struct rcu_torture_ops sched_ops_sync = { .init = rcu_sync_torture_init, .cleanup = NULL, .readlock = sched_torture_read_lock, .readdelay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, .completed = sched_torture_completed, .deferredfree = rcu_sync_torture_deferred_free, .sync = sched_torture_synchronize, .cb_barrier = NULL, .stats = NULL, .name = "sched_sync" }; |
72e9bb549 [PATCH] rcutortur... |
581 |
/* |
a241ec65a [PATCH] RCU tortu... |
582 583 584 585 586 587 588 589 590 591 592 593 594 595 |
* 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... |
596 |
set_user_nice(current, 19); |
a241ec65a [PATCH] RCU tortu... |
597 598 |
do { schedule_timeout_uninterruptible(1); |
a241ec65a [PATCH] RCU tortu... |
599 600 601 602 603 |
if ((rp = rcu_torture_alloc()) == NULL) continue; rp->rtort_pipe_count = 0; udelay(rcu_random(&rand) & 0x3ff); old_rp = rcu_torture_current; |
996417d2c [PATCH] add succe... |
604 |
rp->rtort_mbtest = 1; |
a241ec65a [PATCH] RCU tortu... |
605 606 |
rcu_assign_pointer(rcu_torture_current, rp); smp_wmb(); |
c8e5b1631 rcutorture: style... |
607 |
if (old_rp) { |
a241ec65a [PATCH] RCU tortu... |
608 609 610 611 612 |
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++; |
72e9bb549 [PATCH] rcutortur... |
613 |
cur_ops->deferredfree(old_rp); |
a241ec65a [PATCH] RCU tortu... |
614 615 |
} rcu_torture_current_version++; |
72e9bb549 [PATCH] rcutortur... |
616 |
oldbatch = cur_ops->completed(); |
c9d557c19 rcu: fix bug in r... |
617 618 |
rcu_stutter_wait("rcu_torture_writer"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
a241ec65a [PATCH] RCU tortu... |
619 |
VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); |
c9d557c19 rcu: fix bug in r... |
620 621 |
rcutorture_shutdown_absorb("rcu_torture_writer"); while (!kthread_should_stop()) |
a241ec65a [PATCH] RCU tortu... |
622 623 624 625 626 |
schedule_timeout_uninterruptible(1); return 0; } /* |
b772e1dd4 [PATCH] RCU: add ... |
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 |
* 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... |
642 643 |
rcu_stutter_wait("rcu_torture_fakewriter"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
b772e1dd4 [PATCH] RCU: add ... |
644 645 |
VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); |
c9d557c19 rcu: fix bug in r... |
646 647 |
rcutorture_shutdown_absorb("rcu_torture_fakewriter"); while (!kthread_should_stop()) |
b772e1dd4 [PATCH] RCU: add ... |
648 649 650 651 652 |
schedule_timeout_uninterruptible(1); return 0; } /* |
0729fbf3b rcu: make rcutort... |
653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 |
* 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(); p = rcu_dereference(rcu_torture_current); 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); cur_ops->readdelay(&rand); 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; } ++__get_cpu_var(rcu_torture_count)[pipe_count]; completed = cur_ops->completed() - completed; if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } ++__get_cpu_var(rcu_torture_batch)[completed]; preempt_enable(); cur_ops->readunlock(idx); } /* |
a241ec65a [PATCH] RCU tortu... |
699 700 701 702 703 704 705 706 707 |
* 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... |
708 |
int idx; |
a241ec65a [PATCH] RCU tortu... |
709 710 711 |
DEFINE_RCU_RANDOM(rand); struct rcu_torture *p; int pipe_count; |
0729fbf3b rcu: make rcutort... |
712 |
struct timer_list t; |
a241ec65a [PATCH] RCU tortu... |
713 714 |
VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); |
dbdf65b1b [PATCH] rcutortur... |
715 |
set_user_nice(current, 19); |
0729fbf3b rcu: make rcutort... |
716 717 |
if (irqreader && cur_ops->irqcapable) setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1b [PATCH] rcutortur... |
718 |
|
a241ec65a [PATCH] RCU tortu... |
719 |
do { |
0729fbf3b rcu: make rcutort... |
720 721 722 723 |
if (irqreader && cur_ops->irqcapable) { if (!timer_pending(&t)) mod_timer(&t, 1); } |
72e9bb549 [PATCH] rcutortur... |
724 725 |
idx = cur_ops->readlock(); completed = cur_ops->completed(); |
a241ec65a [PATCH] RCU tortu... |
726 727 728 |
p = rcu_dereference(rcu_torture_current); if (p == NULL) { /* Wait for rcu_torture_writer to get underway */ |
72e9bb549 [PATCH] rcutortur... |
729 |
cur_ops->readunlock(idx); |
a241ec65a [PATCH] RCU tortu... |
730 731 732 |
schedule_timeout_interruptible(HZ); continue; } |
996417d2c [PATCH] add succe... |
733 734 |
if (p->rtort_mbtest == 0) atomic_inc(&n_rcu_torture_mberror); |
b2896d2e7 [PATCH] srcu-3: a... |
735 |
cur_ops->readdelay(&rand); |
a241ec65a [PATCH] RCU tortu... |
736 737 738 739 740 741 742 |
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; } ++__get_cpu_var(rcu_torture_count)[pipe_count]; |
72e9bb549 [PATCH] rcutortur... |
743 |
completed = cur_ops->completed() - completed; |
a241ec65a [PATCH] RCU tortu... |
744 745 746 747 748 749 |
if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } ++__get_cpu_var(rcu_torture_batch)[completed]; preempt_enable(); |
72e9bb549 [PATCH] rcutortur... |
750 |
cur_ops->readunlock(idx); |
a241ec65a [PATCH] RCU tortu... |
751 |
schedule(); |
c9d557c19 rcu: fix bug in r... |
752 753 |
rcu_stutter_wait("rcu_torture_reader"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
a241ec65a [PATCH] RCU tortu... |
754 |
VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); |
c9d557c19 rcu: fix bug in r... |
755 |
rcutorture_shutdown_absorb("rcu_torture_reader"); |
0729fbf3b rcu: make rcutort... |
756 757 |
if (irqreader && cur_ops->irqcapable) del_timer_sync(&t); |
c9d557c19 rcu: fix bug in r... |
758 |
while (!kthread_should_stop()) |
a241ec65a [PATCH] RCU tortu... |
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 |
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_... |
774 |
for_each_possible_cpu(cpu) { |
a241ec65a [PATCH] RCU tortu... |
775 776 777 778 779 780 781 782 783 |
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... |
784 |
cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
785 |
cnt += sprintf(&page[cnt], |
996417d2c [PATCH] add succe... |
786 |
"rtc: %p ver: %ld tfle: %d rta: %d rtaf: %d rtf: %d " |
0729fbf3b rcu: make rcutort... |
787 |
"rtmbe: %d nt: %ld", |
a241ec65a [PATCH] RCU tortu... |
788 789 790 791 792 |
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... |
793 |
atomic_read(&n_rcu_torture_free), |
0729fbf3b rcu: make rcutort... |
794 795 |
atomic_read(&n_rcu_torture_mberror), n_rcu_torture_timers); |
996417d2c [PATCH] add succe... |
796 797 |
if (atomic_read(&n_rcu_torture_mberror) != 0) cnt += sprintf(&page[cnt], " !!!"); |
72e9bb549 [PATCH] rcutortur... |
798 799 |
cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
996417d2c [PATCH] add succe... |
800 |
if (i > 1) { |
a241ec65a [PATCH] RCU tortu... |
801 |
cnt += sprintf(&page[cnt], "!!! "); |
996417d2c [PATCH] add succe... |
802 |
atomic_inc(&n_rcu_torture_error); |
5af970a48 rcutorture: WARN_... |
803 |
WARN_ON_ONCE(1); |
996417d2c [PATCH] add succe... |
804 |
} |
a241ec65a [PATCH] RCU tortu... |
805 806 807 |
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... |
808 809 |
cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
810 |
cnt += sprintf(&page[cnt], "Reader Batch: "); |
72e9bb549 [PATCH] rcutortur... |
811 |
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
a241ec65a [PATCH] RCU tortu... |
812 |
cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); |
72e9bb549 [PATCH] rcutortur... |
813 814 |
cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
815 816 817 818 819 820 821 |
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... |
822 |
if (cur_ops->stats) |
72e9bb549 [PATCH] rcutortur... |
823 |
cnt += cur_ops->stats(&page[cnt]); |
a241ec65a [PATCH] RCU tortu... |
824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 |
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... |
858 859 |
rcutorture_shutdown_absorb("rcu_torture_stats"); } while (!kthread_should_stop()); |
a241ec65a [PATCH] RCU tortu... |
860 861 862 |
VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); return 0; } |
d84f52034 [PATCH] Extend RC... |
863 864 865 866 867 |
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... |
868 |
static void rcu_torture_shuffle_tasks(void) |
d84f52034 [PATCH] Extend RC... |
869 |
{ |
d84f52034 [PATCH] Extend RC... |
870 |
int i; |
73d0a4b10 cpumask: convert ... |
871 |
cpumask_setall(shuffle_tmp_mask); |
86ef5c9a8 cpu-hotplug: repl... |
872 |
get_online_cpus(); |
d84f52034 [PATCH] Extend RC... |
873 874 |
/* No point in shuffling if there is only one online CPU (ex: UP) */ |
c9d557c19 rcu: fix bug in r... |
875 876 877 878 |
if (num_online_cpus() == 1) { put_online_cpus(); return; } |
d84f52034 [PATCH] Extend RC... |
879 880 |
if (rcu_idle_cpu != -1) |
73d0a4b10 cpumask: convert ... |
881 |
cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
882 |
|
73d0a4b10 cpumask: convert ... |
883 |
set_cpus_allowed_ptr(current, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
884 |
|
c8e5b1631 rcutorture: style... |
885 |
if (reader_tasks) { |
d84f52034 [PATCH] Extend RC... |
886 887 |
for (i = 0; i < nrealreaders; i++) if (reader_tasks[i]) |
f70316dac generic: use new ... |
888 |
set_cpus_allowed_ptr(reader_tasks[i], |
73d0a4b10 cpumask: convert ... |
889 |
shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
890 |
} |
c8e5b1631 rcutorture: style... |
891 |
if (fakewriter_tasks) { |
b772e1dd4 [PATCH] RCU: add ... |
892 893 |
for (i = 0; i < nfakewriters; i++) if (fakewriter_tasks[i]) |
f70316dac generic: use new ... |
894 |
set_cpus_allowed_ptr(fakewriter_tasks[i], |
73d0a4b10 cpumask: convert ... |
895 |
shuffle_tmp_mask); |
b772e1dd4 [PATCH] RCU: add ... |
896 |
} |
d84f52034 [PATCH] Extend RC... |
897 |
if (writer_task) |
73d0a4b10 cpumask: convert ... |
898 |
set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
899 900 |
if (stats_task) |
73d0a4b10 cpumask: convert ... |
901 |
set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
902 903 904 905 906 |
if (rcu_idle_cpu == -1) rcu_idle_cpu = num_online_cpus() - 1; else rcu_idle_cpu--; |
86ef5c9a8 cpu-hotplug: repl... |
907 |
put_online_cpus(); |
d84f52034 [PATCH] Extend RC... |
908 909 910 911 912 913 914 915 916 917 918 919 920 |
} /* 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... |
921 922 |
rcutorture_shutdown_absorb("rcu_torture_shuffle"); } while (!kthread_should_stop()); |
d84f52034 [PATCH] Extend RC... |
923 924 925 |
VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); return 0; } |
d120f65f3 rcu: make rcutort... |
926 927 928 929 930 931 932 933 934 935 |
/* 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... |
936 |
if (!kthread_should_stop()) |
d120f65f3 rcu: make rcutort... |
937 938 |
schedule_timeout_interruptible(stutter * HZ); stutter_pause_test = 0; |
c9d557c19 rcu: fix bug in r... |
939 940 |
rcutorture_shutdown_absorb("rcu_torture_stutter"); } while (!kthread_should_stop()); |
d120f65f3 rcu: make rcutort... |
941 942 943 |
VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); return 0; } |
95c383227 [PATCH] rcutortur... |
944 945 946 |
static inline void rcu_torture_print_module_parms(char *tag) { |
b772e1dd4 [PATCH] RCU: add ... |
947 948 |
printk(KERN_ALERT "%s" TORTURE_FLAG "--- %s: nreaders=%d nfakewriters=%d " |
95c383227 [PATCH] rcutortur... |
949 |
"stat_interval=%d verbose=%d test_no_idle_hz=%d " |
0729fbf3b rcu: make rcutort... |
950 951 |
"shuffle_interval=%d stutter=%d irqreader=%d ", |
b772e1dd4 [PATCH] RCU: add ... |
952 |
torture_type, tag, nrealreaders, nfakewriters, |
d120f65f3 rcu: make rcutort... |
953 |
stat_interval, verbose, test_no_idle_hz, shuffle_interval, |
0729fbf3b rcu: make rcutort... |
954 |
stutter, irqreader); |
95c383227 [PATCH] rcutortur... |
955 |
} |
343e9099c rcu: fix rcutortu... |
956 957 958 |
static struct notifier_block rcutorture_nb = { .notifier_call = rcutorture_shutdown_notify, }; |
a241ec65a [PATCH] RCU tortu... |
959 960 961 962 |
static void rcu_torture_cleanup(void) { int i; |
343e9099c rcu: fix rcutortu... |
963 |
mutex_lock(&fullstop_mutex); |
c9d557c19 rcu: fix bug in r... |
964 965 966 967 |
if (fullstop == FULLSTOP_SHUTDOWN) { printk(KERN_WARNING /* but going down anyway, so... */ "Concurrent 'rmmod rcutorture' and shutdown illegal! "); |
343e9099c rcu: fix rcutortu... |
968 |
mutex_unlock(&fullstop_mutex); |
c9d557c19 rcu: fix bug in r... |
969 |
schedule_timeout_uninterruptible(10); |
343e9099c rcu: fix rcutortu... |
970 971 972 973 |
if (cur_ops->cb_barrier != NULL) cur_ops->cb_barrier(); return; } |
c9d557c19 rcu: fix bug in r... |
974 |
fullstop = FULLSTOP_RMMOD; |
343e9099c rcu: fix rcutortu... |
975 976 |
mutex_unlock(&fullstop_mutex); unregister_reboot_notifier(&rcutorture_nb); |
d120f65f3 rcu: make rcutort... |
977 978 979 980 981 |
if (stutter_task) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); kthread_stop(stutter_task); } stutter_task = NULL; |
c8e5b1631 rcutorture: style... |
982 |
if (shuffler_task) { |
d84f52034 [PATCH] Extend RC... |
983 984 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); kthread_stop(shuffler_task); |
73d0a4b10 cpumask: convert ... |
985 |
free_cpumask_var(shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
986 987 |
} shuffler_task = NULL; |
c8e5b1631 rcutorture: style... |
988 |
if (writer_task) { |
a241ec65a [PATCH] RCU tortu... |
989 990 991 992 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); kthread_stop(writer_task); } writer_task = NULL; |
c8e5b1631 rcutorture: style... |
993 |
if (reader_tasks) { |
a241ec65a [PATCH] RCU tortu... |
994 |
for (i = 0; i < nrealreaders; i++) { |
c8e5b1631 rcutorture: style... |
995 |
if (reader_tasks[i]) { |
a241ec65a [PATCH] RCU tortu... |
996 997 998 999 1000 1001 1002 1003 1004 1005 |
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... |
1006 |
if (fakewriter_tasks) { |
b772e1dd4 [PATCH] RCU: add ... |
1007 |
for (i = 0; i < nfakewriters; i++) { |
c8e5b1631 rcutorture: style... |
1008 |
if (fakewriter_tasks[i]) { |
b772e1dd4 [PATCH] RCU: add ... |
1009 1010 1011 1012 1013 1014 1015 1016 1017 |
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... |
1018 |
if (stats_task) { |
a241ec65a [PATCH] RCU tortu... |
1019 1020 1021 1022 1023 1024 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); kthread_stop(stats_task); } stats_task = NULL; /* Wait for all RCU callbacks to fire. */ |
2326974df rcu: add call_rcu... |
1025 1026 1027 |
if (cur_ops->cb_barrier != NULL) cur_ops->cb_barrier(); |
a241ec65a [PATCH] RCU tortu... |
1028 |
|
a241ec65a [PATCH] RCU tortu... |
1029 |
rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb549 [PATCH] rcutortur... |
1030 |
|
c8e5b1631 rcutorture: style... |
1031 |
if (cur_ops->cleanup) |
72e9bb549 [PATCH] rcutortur... |
1032 |
cur_ops->cleanup(); |
95c383227 [PATCH] rcutortur... |
1033 1034 1035 1036 |
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... |
1037 |
} |
6f8bc500a rcutorture: Mark ... |
1038 |
static int __init |
a241ec65a [PATCH] RCU tortu... |
1039 1040 1041 1042 1043 |
rcu_torture_init(void) { int i; int cpu; int firsterr = 0; |
ade5fb818 rcutorture: Remov... |
1044 1045 |
static struct rcu_torture_ops *torture_ops[] = { &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &rcu_bh_sync_ops, |
2326974df rcu: add call_rcu... |
1046 |
&srcu_ops, &sched_ops, &sched_ops_sync, }; |
a241ec65a [PATCH] RCU tortu... |
1047 |
|
343e9099c rcu: fix rcutortu... |
1048 |
mutex_lock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
1049 |
/* Process args and tell the world that the torturer is on the job. */ |
ade5fb818 rcutorture: Remov... |
1050 |
for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb549 [PATCH] rcutortur... |
1051 |
cur_ops = torture_ops[i]; |
ade5fb818 rcutorture: Remov... |
1052 |
if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb549 [PATCH] rcutortur... |
1053 |
break; |
72e9bb549 [PATCH] rcutortur... |
1054 |
} |
ade5fb818 rcutorture: Remov... |
1055 |
if (i == ARRAY_SIZE(torture_ops)) { |
72e9bb549 [PATCH] rcutortur... |
1056 1057 1058 |
printk(KERN_ALERT "rcutorture: invalid torture type: \"%s\" ", torture_type); |
343e9099c rcu: fix rcutortu... |
1059 |
mutex_unlock(&fullstop_mutex); |
72e9bb549 [PATCH] rcutortur... |
1060 1061 |
return (-EINVAL); } |
c8e5b1631 rcutorture: style... |
1062 |
if (cur_ops->init) |
72e9bb549 [PATCH] rcutortur... |
1063 |
cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
a241ec65a [PATCH] RCU tortu... |
1064 1065 1066 1067 |
if (nreaders >= 0) nrealreaders = nreaders; else nrealreaders = 2 * num_online_cpus(); |
95c383227 [PATCH] rcutortur... |
1068 |
rcu_torture_print_module_parms("Start of test"); |
c9d557c19 rcu: fix bug in r... |
1069 |
fullstop = FULLSTOP_DONTSTOP; |
a241ec65a [PATCH] RCU tortu... |
1070 1071 1072 1073 |
/* Set up the freelist. */ INIT_LIST_HEAD(&rcu_torture_freelist); |
788e770eb rcutorture: Use A... |
1074 |
for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2c [PATCH] add succe... |
1075 |
rcu_tortures[i].rtort_mbtest = 0; |
a241ec65a [PATCH] RCU tortu... |
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 |
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... |
1087 1088 |
atomic_set(&n_rcu_torture_mberror, 0); atomic_set(&n_rcu_torture_error, 0); |
a241ec65a [PATCH] RCU tortu... |
1089 1090 |
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) atomic_set(&rcu_torture_wcount[i], 0); |
0a9450227 [PATCH] for_each_... |
1091 |
for_each_possible_cpu(cpu) { |
a241ec65a [PATCH] RCU tortu... |
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 |
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 ... |
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 |
fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), GFP_KERNEL); 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, "rcu_torture_fakewriter"); 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... |
1127 |
reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65a [PATCH] RCU tortu... |
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 |
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... |
1156 1157 |
if (test_no_idle_hz) { rcu_idle_cpu = num_online_cpus() - 1; |
73d0a4b10 cpumask: convert ... |
1158 1159 1160 1161 1162 1163 |
if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { firsterr = -ENOMEM; VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask"); goto unwind; } |
d84f52034 [PATCH] Extend RC... |
1164 1165 1166 1167 |
/* Create the shuffler thread */ shuffler_task = kthread_run(rcu_torture_shuffle, NULL, "rcu_torture_shuffle"); if (IS_ERR(shuffler_task)) { |
73d0a4b10 cpumask: convert ... |
1168 |
free_cpumask_var(shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1169 1170 1171 1172 1173 1174 |
firsterr = PTR_ERR(shuffler_task); VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); shuffler_task = NULL; goto unwind; } } |
d120f65f3 rcu: make rcutort... |
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 |
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; } } |
343e9099c rcu: fix rcutortu... |
1188 1189 |
register_reboot_notifier(&rcutorture_nb); mutex_unlock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
1190 1191 1192 |
return 0; unwind: |
343e9099c rcu: fix rcutortu... |
1193 |
mutex_unlock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
1194 1195 1196 1197 1198 1199 |
rcu_torture_cleanup(); return firsterr; } module_init(rcu_torture_init); module_exit(rcu_torture_cleanup); |