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kernel/rcutorture.c
63.5 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> |
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#include <linux/atomic.h> |
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#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 <linux/trace_clock.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 = 60; /* Interval between stats, in seconds. */ /* Zero means "only at end of test". */ |
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static bool verbose; /* Print more debug info. */ |
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static bool test_no_idle_hz = true; /* Test RCU 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; /* Duration of bursts (us), 0 to disable. */ static int fqs_holdoff; /* Hold time within burst (us). */ |
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static int fqs_stutter = 3; /* Wait time between bursts (s). */ |
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static int n_barrier_cbs; /* Number of callbacks to test RCU barriers. */ |
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static int onoff_interval; /* Wait time between CPU hotplugs, 0=disable. */ |
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static int onoff_holdoff; /* Seconds after boot before CPU hotplugs. */ |
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static int shutdown_secs; /* Shutdown time (s). <=0 for no shutdown. */ |
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static int stall_cpu; /* CPU-stall duration (s). 0 for no stall. */ static int stall_cpu_holdoff = 10; /* Time to wait until stall (s). */ |
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static int test_boost = 1; /* Test RCU prio boost: 0=no, 1=maybe, 2=yes. */ static int test_boost_interval = 7; /* Interval between boost tests, seconds. */ static int test_boost_duration = 4; /* Duration of each boost test, seconds. */ |
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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, 0644); |
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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(n_barrier_cbs, int, 0444); MODULE_PARM_DESC(n_barrier_cbs, "# of callbacks/kthreads for barrier testing"); |
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module_param(onoff_interval, int, 0444); MODULE_PARM_DESC(onoff_interval, "Time between CPU hotplugs (s), 0=disable"); |
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module_param(onoff_holdoff, int, 0444); MODULE_PARM_DESC(onoff_holdoff, "Time after boot before CPU hotplugs (s)"); |
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module_param(shutdown_secs, int, 0444); MODULE_PARM_DESC(shutdown_secs, "Shutdown time (s), zero to disable."); |
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module_param(stall_cpu, int, 0444); MODULE_PARM_DESC(stall_cpu, "Stall duration (s), zero to disable."); module_param(stall_cpu_holdoff, int, 0444); MODULE_PARM_DESC(stall_cpu_holdoff, "Time to wait before starting stall (s)."); |
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module_param(test_boost, int, 0444); MODULE_PARM_DESC(test_boost, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); module_param(test_boost_interval, int, 0444); MODULE_PARM_DESC(test_boost_interval, "Interval between boost tests, seconds."); module_param(test_boost_duration, int, 0444); MODULE_PARM_DESC(test_boost_duration, "Duration of each boost test, seconds."); |
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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 { pr_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) pr_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) pr_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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static struct task_struct *boost_tasks[NR_CPUS]; |
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static struct task_struct *shutdown_task; |
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#ifdef CONFIG_HOTPLUG_CPU static struct task_struct *onoff_task; #endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
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static struct task_struct *stall_task; |
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static struct task_struct **barrier_cbs_tasks; static struct task_struct *barrier_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 *rcu_torture_current; |
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static unsigned 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_barrier_error; |
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static long n_rcu_torture_boost_ktrerror; static long n_rcu_torture_boost_rterror; |
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static long n_rcu_torture_boost_failure; static long n_rcu_torture_boosts; |
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static long n_rcu_torture_timers; |
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static long n_offline_attempts; static long n_offline_successes; |
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static unsigned long sum_offline; static int min_offline = -1; static int max_offline; |
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static long n_online_attempts; static long n_online_successes; |
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static unsigned long sum_online; static int min_online = -1; static int max_online; |
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static long n_barrier_attempts; static long n_barrier_successes; |
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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; |
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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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module_param(rcutorture_runnable, int, 0444); MODULE_PARM_DESC(rcutorture_runnable, "Start rcutorture at boot"); |
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#if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
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#define rcu_can_boost() 1 |
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#else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
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#define rcu_can_boost() 0 |
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#endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
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#ifdef CONFIG_RCU_TRACE static u64 notrace rcu_trace_clock_local(void) { u64 ts = trace_clock_local(); unsigned long __maybe_unused ts_rem = do_div(ts, NSEC_PER_USEC); return ts; } #else /* #ifdef CONFIG_RCU_TRACE */ static u64 notrace rcu_trace_clock_local(void) { return 0ULL; } #endif /* #else #ifdef CONFIG_RCU_TRACE */ |
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static unsigned long shutdown_time; /* jiffies to system shutdown. */ |
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static unsigned long boost_starttime; /* jiffies of next boost test start. */ DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ /* and boost task create/destroy. */ |
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static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
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static bool barrier_phase; /* Test phase. */ |
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static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); |
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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; |
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/* * Protect fullstop transitions and spawning of kthreads. */ static DEFINE_MUTEX(fullstop_mutex); |
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/* Forward reference. */ static void rcu_torture_cleanup(void); |
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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 |
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pr_warn(/* but going down anyway, so... */ |
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"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) { |
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pr_notice( |
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"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) { |
e3d7be270 rcu, rcutorture: ... |
341 342 343 |
if (rcutorture_runnable) schedule_timeout_interruptible(1); else |
3ccf79f45 rcu: make quiesce... |
344 |
schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
c9d557c19 rcu: fix bug in r... |
345 |
rcutorture_shutdown_absorb(title); |
343e9099c rcu: fix rcutortu... |
346 |
} |
d120f65f3 rcu: make rcutort... |
347 |
} |
a241ec65a [PATCH] RCU tortu... |
348 |
/* |
72e9bb549 [PATCH] rcutortur... |
349 350 351 352 353 |
* Operations vector for selecting different types of tests. */ struct rcu_torture_ops { void (*init)(void); |
72e9bb549 [PATCH] rcutortur... |
354 |
int (*readlock)(void); |
0acc512cb rcu: Add synchron... |
355 |
void (*read_delay)(struct rcu_random_state *rrsp); |
72e9bb549 [PATCH] rcutortur... |
356 357 |
void (*readunlock)(int idx); int (*completed)(void); |
0acc512cb rcu: Add synchron... |
358 |
void (*deferred_free)(struct rcu_torture *p); |
b772e1dd4 [PATCH] RCU: add ... |
359 |
void (*sync)(void); |
fae4b54f2 rcu: Introduce rc... |
360 |
void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
2326974df rcu: add call_rcu... |
361 |
void (*cb_barrier)(void); |
bf66f18e7 rcu: Add force_qu... |
362 |
void (*fqs)(void); |
72e9bb549 [PATCH] rcutortur... |
363 |
int (*stats)(char *page); |
0acc512cb rcu: Add synchron... |
364 |
int irq_capable; |
8e8be45e8 rcu: add priority... |
365 |
int can_boost; |
72e9bb549 [PATCH] rcutortur... |
366 367 |
char *name; }; |
a71fca58b rcu: Fix whitespa... |
368 369 |
static struct rcu_torture_ops *cur_ops; |
72e9bb549 [PATCH] rcutortur... |
370 371 372 373 |
/* * Definitions for rcu torture testing. */ |
a49a4af75 [PATCH] rcu: add ... |
374 |
static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb549 [PATCH] rcutortur... |
375 376 377 378 |
{ rcu_read_lock(); return 0; } |
b2896d2e7 [PATCH] srcu-3: a... |
379 380 |
static void rcu_read_delay(struct rcu_random_state *rrsp) { |
b8d57a76d rcutorture: Occas... |
381 382 |
const unsigned long shortdelay_us = 200; const unsigned long longdelay_ms = 50; |
b2896d2e7 [PATCH] srcu-3: a... |
383 |
|
b8d57a76d rcutorture: Occas... |
384 385 386 |
/* 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. */ |
b2896d2e7 [PATCH] srcu-3: a... |
387 |
|
b8d57a76d rcutorture: Occas... |
388 389 390 391 |
if (!(rcu_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) mdelay(longdelay_ms); if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) udelay(shortdelay_us); |
e546f485e rcutorture: add r... |
392 393 394 395 |
#ifdef CONFIG_PREEMPT if (!preempt_count() && !(rcu_random(rrsp) % (nrealreaders * 20000))) preempt_schedule(); /* No QS if preempt_disable() in effect */ #endif |
b2896d2e7 [PATCH] srcu-3: a... |
396 |
} |
a49a4af75 [PATCH] rcu: add ... |
397 |
static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb549 [PATCH] rcutortur... |
398 399 400 401 402 403 404 405 406 407 408 409 410 411 |
{ 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); |
c9d557c19 rcu: fix bug in r... |
412 |
if (fullstop != FULLSTOP_DONTSTOP) { |
72e9bb549 [PATCH] rcutortur... |
413 414 415 416 417 418 419 420 421 422 423 |
/* 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); |
c701d5d9b rcu: Fix code-sty... |
424 |
} else { |
0acc512cb rcu: Add synchron... |
425 |
cur_ops->deferred_free(rp); |
c701d5d9b rcu: Fix code-sty... |
426 |
} |
72e9bb549 [PATCH] rcutortur... |
427 |
} |
d9a3da069 rcu: Add expedite... |
428 429 430 431 |
static int rcu_no_completed(void) { return 0; } |
72e9bb549 [PATCH] rcutortur... |
432 433 434 435 436 437 |
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 = { |
0acc512cb rcu: Add synchron... |
438 |
.init = NULL, |
0acc512cb rcu: Add synchron... |
439 440 441 442 443 444 |
.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, |
fae4b54f2 rcu: Introduce rc... |
445 |
.call = call_rcu, |
0acc512cb rcu: Add synchron... |
446 |
.cb_barrier = rcu_barrier, |
bf66f18e7 rcu: Add force_qu... |
447 |
.fqs = rcu_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
448 |
.stats = NULL, |
a71fca58b rcu: Fix whitespa... |
449 |
.irq_capable = 1, |
8e8be45e8 rcu: add priority... |
450 |
.can_boost = rcu_can_boost(), |
a71fca58b rcu: Fix whitespa... |
451 |
.name = "rcu" |
72e9bb549 [PATCH] rcutortur... |
452 |
}; |
e30337365 [PATCH] rcu: refa... |
453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 |
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); } |
20d2e4283 [PATCH] rcu: add ... |
478 |
static struct rcu_torture_ops rcu_sync_ops = { |
0acc512cb rcu: Add synchron... |
479 |
.init = rcu_sync_torture_init, |
0acc512cb rcu: Add synchron... |
480 481 482 483 484 485 |
.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, |
fae4b54f2 rcu: Introduce rc... |
486 |
.call = NULL, |
0acc512cb rcu: Add synchron... |
487 |
.cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
488 |
.fqs = rcu_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
489 490 |
.stats = NULL, .irq_capable = 1, |
8e8be45e8 rcu: add priority... |
491 |
.can_boost = rcu_can_boost(), |
0acc512cb rcu: Add synchron... |
492 |
.name = "rcu_sync" |
20d2e4283 [PATCH] rcu: add ... |
493 |
}; |
d9a3da069 rcu: Add expedite... |
494 495 |
static struct rcu_torture_ops rcu_expedited_ops = { .init = rcu_sync_torture_init, |
d9a3da069 rcu: Add expedite... |
496 497 498 499 500 501 |
.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, |
fae4b54f2 rcu: Introduce rc... |
502 |
.call = NULL, |
d9a3da069 rcu: Add expedite... |
503 |
.cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
504 |
.fqs = rcu_force_quiescent_state, |
d9a3da069 rcu: Add expedite... |
505 506 |
.stats = NULL, .irq_capable = 1, |
8e8be45e8 rcu: add priority... |
507 |
.can_boost = rcu_can_boost(), |
d9a3da069 rcu: Add expedite... |
508 509 |
.name = "rcu_expedited" }; |
c32e06605 [PATCH] rcutortur... |
510 511 512 |
/* * Definitions for rcu_bh torture testing. */ |
a49a4af75 [PATCH] rcu: add ... |
513 |
static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e06605 [PATCH] rcutortur... |
514 515 516 517 |
{ rcu_read_lock_bh(); return 0; } |
a49a4af75 [PATCH] rcu: add ... |
518 |
static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e06605 [PATCH] rcutortur... |
519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 |
{ 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); } static struct rcu_torture_ops rcu_bh_ops = { |
0acc512cb rcu: Add synchron... |
534 |
.init = NULL, |
0acc512cb rcu: Add synchron... |
535 536 537 538 539 |
.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, |
bdf2a4364 rcu: Catch rcutor... |
540 |
.sync = synchronize_rcu_bh, |
fae4b54f2 rcu: Introduce rc... |
541 |
.call = call_rcu_bh, |
0acc512cb rcu: Add synchron... |
542 |
.cb_barrier = rcu_barrier_bh, |
bf66f18e7 rcu: Add force_qu... |
543 |
.fqs = rcu_bh_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
544 545 546 |
.stats = NULL, .irq_capable = 1, .name = "rcu_bh" |
c32e06605 [PATCH] rcutortur... |
547 |
}; |
11a147013 [PATCH] rcu: add ... |
548 |
static struct rcu_torture_ops rcu_bh_sync_ops = { |
0acc512cb rcu: Add synchron... |
549 |
.init = rcu_sync_torture_init, |
0acc512cb rcu: Add synchron... |
550 551 552 553 554 |
.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, |
bdf2a4364 rcu: Catch rcutor... |
555 |
.sync = synchronize_rcu_bh, |
fae4b54f2 rcu: Introduce rc... |
556 |
.call = NULL, |
0acc512cb rcu: Add synchron... |
557 |
.cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
558 |
.fqs = rcu_bh_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
559 560 561 |
.stats = NULL, .irq_capable = 1, .name = "rcu_bh_sync" |
11a147013 [PATCH] rcu: add ... |
562 |
}; |
bdf2a4364 rcu: Catch rcutor... |
563 564 |
static struct rcu_torture_ops rcu_bh_expedited_ops = { .init = rcu_sync_torture_init, |
bdf2a4364 rcu: Catch rcutor... |
565 566 567 568 569 570 |
.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 = synchronize_rcu_bh_expedited, |
fae4b54f2 rcu: Introduce rc... |
571 |
.call = NULL, |
bdf2a4364 rcu: Catch rcutor... |
572 573 574 575 576 577 |
.cb_barrier = NULL, .fqs = rcu_bh_force_quiescent_state, .stats = NULL, .irq_capable = 1, .name = "rcu_bh_expedited" }; |
b2896d2e7 [PATCH] srcu-3: a... |
578 579 580 |
/* * Definitions for srcu torture testing. */ |
cda4dc813 rcutorture: Use D... |
581 |
DEFINE_STATIC_SRCU(srcu_ctl); |
b2896d2e7 [PATCH] srcu-3: a... |
582 |
|
012d3ca8d [PATCH] Add Spars... |
583 |
static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e7 [PATCH] srcu-3: a... |
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 |
{ 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); |
e546f485e rcutorture: add r... |
599 600 |
else rcu_read_delay(rrsp); |
b2896d2e7 [PATCH] srcu-3: a... |
601 |
} |
012d3ca8d [PATCH] Add Spars... |
602 |
static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e7 [PATCH] srcu-3: a... |
603 604 605 606 607 608 609 610 |
{ srcu_read_unlock(&srcu_ctl, idx); } static int srcu_torture_completed(void) { return srcu_batches_completed(&srcu_ctl); } |
9059c9401 rcu: Add rcutortu... |
611 612 613 614 |
static void srcu_torture_deferred_free(struct rcu_torture *rp) { call_srcu(&srcu_ctl, &rp->rtort_rcu, rcu_torture_cb); } |
b772e1dd4 [PATCH] RCU: add ... |
615 616 617 618 |
static void srcu_torture_synchronize(void) { synchronize_srcu(&srcu_ctl); } |
e3f8d3788 rcu: Test srcu_ba... |
619 620 621 622 623 624 625 626 627 628 |
static void srcu_torture_call(struct rcu_head *head, void (*func)(struct rcu_head *head)) { call_srcu(&srcu_ctl, head, func); } static void srcu_torture_barrier(void) { srcu_barrier(&srcu_ctl); } |
b2896d2e7 [PATCH] srcu-3: a... |
629 630 631 632 633 634 635 636 637 |
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) { |
cef50120b rcu: Direct algor... |
638 |
cnt += sprintf(&page[cnt], " %d(%lu,%lu)", cpu, |
b2896d2e7 [PATCH] srcu-3: a... |
639 640 641 642 643 644 645 646 647 |
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 = { |
cda4dc813 rcutorture: Use D... |
648 |
.init = rcu_sync_torture_init, |
0acc512cb rcu: Add synchron... |
649 650 651 652 |
.readlock = srcu_torture_read_lock, .read_delay = srcu_read_delay, .readunlock = srcu_torture_read_unlock, .completed = srcu_torture_completed, |
9059c9401 rcu: Add rcutortu... |
653 |
.deferred_free = srcu_torture_deferred_free, |
0acc512cb rcu: Add synchron... |
654 |
.sync = srcu_torture_synchronize, |
e3f8d3788 rcu: Test srcu_ba... |
655 656 |
.call = srcu_torture_call, .cb_barrier = srcu_torture_barrier, |
0acc512cb rcu: Add synchron... |
657 658 |
.stats = srcu_torture_stats, .name = "srcu" |
b2896d2e7 [PATCH] srcu-3: a... |
659 |
}; |
9059c9401 rcu: Add rcutortu... |
660 |
static struct rcu_torture_ops srcu_sync_ops = { |
cda4dc813 rcutorture: Use D... |
661 |
.init = rcu_sync_torture_init, |
9059c9401 rcu: Add rcutortu... |
662 663 664 665 666 667 668 669 670 671 672 |
.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, .call = NULL, .cb_barrier = NULL, .stats = srcu_torture_stats, .name = "srcu_sync" }; |
101db7b41 rcu: Add rcutortu... |
673 674 675 676 677 678 679 680 681 682 683 |
static int srcu_torture_read_lock_raw(void) __acquires(&srcu_ctl) { return srcu_read_lock_raw(&srcu_ctl); } static void srcu_torture_read_unlock_raw(int idx) __releases(&srcu_ctl) { srcu_read_unlock_raw(&srcu_ctl, idx); } static struct rcu_torture_ops srcu_raw_ops = { |
cda4dc813 rcutorture: Use D... |
684 |
.init = rcu_sync_torture_init, |
101db7b41 rcu: Add rcutortu... |
685 686 687 688 |
.readlock = srcu_torture_read_lock_raw, .read_delay = srcu_read_delay, .readunlock = srcu_torture_read_unlock_raw, .completed = srcu_torture_completed, |
9059c9401 rcu: Add rcutortu... |
689 |
.deferred_free = srcu_torture_deferred_free, |
101db7b41 rcu: Add rcutortu... |
690 |
.sync = srcu_torture_synchronize, |
fae4b54f2 rcu: Introduce rc... |
691 |
.call = NULL, |
101db7b41 rcu: Add rcutortu... |
692 693 694 695 |
.cb_barrier = NULL, .stats = srcu_torture_stats, .name = "srcu_raw" }; |
9059c9401 rcu: Add rcutortu... |
696 |
static struct rcu_torture_ops srcu_raw_sync_ops = { |
cda4dc813 rcutorture: Use D... |
697 |
.init = rcu_sync_torture_init, |
9059c9401 rcu: Add rcutortu... |
698 699 700 701 702 703 704 705 706 707 708 |
.readlock = srcu_torture_read_lock_raw, .read_delay = srcu_read_delay, .readunlock = srcu_torture_read_unlock_raw, .completed = srcu_torture_completed, .deferred_free = rcu_sync_torture_deferred_free, .sync = srcu_torture_synchronize, .call = NULL, .cb_barrier = NULL, .stats = srcu_torture_stats, .name = "srcu_raw_sync" }; |
804bb8370 rcu: Add synchron... |
709 710 711 712 713 714 |
static void srcu_torture_synchronize_expedited(void) { synchronize_srcu_expedited(&srcu_ctl); } static struct rcu_torture_ops srcu_expedited_ops = { |
cda4dc813 rcutorture: Use D... |
715 |
.init = rcu_sync_torture_init, |
804bb8370 rcu: Add synchron... |
716 717 718 719 720 721 |
.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, |
fae4b54f2 rcu: Introduce rc... |
722 |
.call = NULL, |
804bb8370 rcu: Add synchron... |
723 724 725 726 |
.cb_barrier = NULL, .stats = srcu_torture_stats, .name = "srcu_expedited" }; |
4b6c2cca6 [PATCH] rcu: add ... |
727 728 729 730 731 732 733 734 735 736 737 738 739 740 |
/* * 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... |
741 742 743 744 |
static void rcu_sched_torture_deferred_free(struct rcu_torture *p) { call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); } |
4b6c2cca6 [PATCH] rcu: add ... |
745 |
static struct rcu_torture_ops sched_ops = { |
0acc512cb rcu: Add synchron... |
746 |
.init = rcu_sync_torture_init, |
0acc512cb rcu: Add synchron... |
747 748 749 |
.readlock = sched_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, |
d9a3da069 rcu: Add expedite... |
750 |
.completed = rcu_no_completed, |
0acc512cb rcu: Add synchron... |
751 |
.deferred_free = rcu_sched_torture_deferred_free, |
bdf2a4364 rcu: Catch rcutor... |
752 |
.sync = synchronize_sched, |
0acc512cb rcu: Add synchron... |
753 |
.cb_barrier = rcu_barrier_sched, |
bf66f18e7 rcu: Add force_qu... |
754 |
.fqs = rcu_sched_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
755 756 757 |
.stats = NULL, .irq_capable = 1, .name = "sched" |
4b6c2cca6 [PATCH] rcu: add ... |
758 |
}; |
804bb8370 rcu: Add synchron... |
759 |
static struct rcu_torture_ops sched_sync_ops = { |
0acc512cb rcu: Add synchron... |
760 |
.init = rcu_sync_torture_init, |
0acc512cb rcu: Add synchron... |
761 762 763 |
.readlock = sched_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, |
d9a3da069 rcu: Add expedite... |
764 |
.completed = rcu_no_completed, |
0acc512cb rcu: Add synchron... |
765 |
.deferred_free = rcu_sync_torture_deferred_free, |
bdf2a4364 rcu: Catch rcutor... |
766 |
.sync = synchronize_sched, |
0acc512cb rcu: Add synchron... |
767 |
.cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
768 |
.fqs = rcu_sched_force_quiescent_state, |
0acc512cb rcu: Add synchron... |
769 770 771 |
.stats = NULL, .name = "sched_sync" }; |
0acc512cb rcu: Add synchron... |
772 773 |
static struct rcu_torture_ops sched_expedited_ops = { .init = rcu_sync_torture_init, |
0acc512cb rcu: Add synchron... |
774 775 776 |
.readlock = sched_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ .readunlock = sched_torture_read_unlock, |
d9a3da069 rcu: Add expedite... |
777 |
.completed = rcu_no_completed, |
0acc512cb rcu: Add synchron... |
778 779 780 |
.deferred_free = rcu_sync_torture_deferred_free, .sync = synchronize_sched_expedited, .cb_barrier = NULL, |
bf66f18e7 rcu: Add force_qu... |
781 |
.fqs = rcu_sched_force_quiescent_state, |
969c79215 sched: replace mi... |
782 |
.stats = NULL, |
0acc512cb rcu: Add synchron... |
783 784 |
.irq_capable = 1, .name = "sched_expedited" |
2326974df rcu: add call_rcu... |
785 |
}; |
72e9bb549 [PATCH] rcutortur... |
786 |
/* |
8e8be45e8 rcu: add priority... |
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 |
* RCU torture priority-boost testing. Runs one real-time thread per * CPU for moderate bursts, repeatedly registering RCU callbacks and * spinning waiting for them to be invoked. If a given callback takes * too long to be invoked, we assume that priority inversion has occurred. */ struct rcu_boost_inflight { struct rcu_head rcu; int inflight; }; static void rcu_torture_boost_cb(struct rcu_head *head) { struct rcu_boost_inflight *rbip = container_of(head, struct rcu_boost_inflight, rcu); smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ rbip->inflight = 0; } static int rcu_torture_boost(void *arg) { unsigned long call_rcu_time; unsigned long endtime; unsigned long oldstarttime; struct rcu_boost_inflight rbi = { .inflight = 0 }; struct sched_param sp; VERBOSE_PRINTK_STRING("rcu_torture_boost started"); /* Set real-time priority. */ sp.sched_priority = 1; if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { VERBOSE_PRINTK_STRING("rcu_torture_boost RT prio failed!"); n_rcu_torture_boost_rterror++; } |
561190e3b rcu: mark rcutort... |
823 |
init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e8 rcu: add priority... |
824 825 826 827 |
/* Each pass through the following loop does one boost-test cycle. */ do { /* Wait for the next test interval. */ oldstarttime = boost_starttime; |
93898fb1a rcu: Make rcu_tor... |
828 |
while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8a rcu: Make rcutort... |
829 |
schedule_timeout_interruptible(oldstarttime - jiffies); |
8e8be45e8 rcu: add priority... |
830 831 832 833 834 835 836 837 838 |
rcu_stutter_wait("rcu_torture_boost"); if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) goto checkwait; } /* Do one boost-test interval. */ endtime = oldstarttime + test_boost_duration * HZ; call_rcu_time = jiffies; |
93898fb1a rcu: Make rcu_tor... |
839 |
while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e8 rcu: add priority... |
840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 |
/* If we don't have a callback in flight, post one. */ if (!rbi.inflight) { smp_mb(); /* RCU core before ->inflight = 1. */ rbi.inflight = 1; call_rcu(&rbi.rcu, rcu_torture_boost_cb); if (jiffies - call_rcu_time > test_boost_duration * HZ - HZ / 2) { VERBOSE_PRINTK_STRING("rcu_torture_boost boosting failed"); n_rcu_torture_boost_failure++; } call_rcu_time = jiffies; } cond_resched(); rcu_stutter_wait("rcu_torture_boost"); if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) goto checkwait; } /* * Set the start time of the next test interval. * Yes, this is vulnerable to long delays, but such * delays simply cause a false negative for the next * interval. Besides, we are running at RT priority, * so delays should be relatively rare. */ |
ab8f11e5f rcu: Make rcu_tor... |
866 867 |
while (oldstarttime == boost_starttime && !kthread_should_stop()) { |
8e8be45e8 rcu: add priority... |
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 |
if (mutex_trylock(&boost_mutex)) { boost_starttime = jiffies + test_boost_interval * HZ; n_rcu_torture_boosts++; mutex_unlock(&boost_mutex); break; } schedule_timeout_uninterruptible(1); } /* Go do the stutter. */ checkwait: rcu_stutter_wait("rcu_torture_boost"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); /* Clean up and exit. */ VERBOSE_PRINTK_STRING("rcu_torture_boost task stopping"); rcutorture_shutdown_absorb("rcu_torture_boost"); while (!kthread_should_stop() || rbi.inflight) schedule_timeout_uninterruptible(1); smp_mb(); /* order accesses to ->inflight before stack-frame death. */ |
9d68197c0 rcu: Don't destro... |
888 |
destroy_rcu_head_on_stack(&rbi.rcu); |
8e8be45e8 rcu: add priority... |
889 890 891 892 |
return 0; } /* |
bf66f18e7 rcu: Add force_qu... |
893 894 895 896 897 898 899 900 901 902 903 904 905 |
* 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; |
93898fb1a rcu: Make rcu_tor... |
906 907 |
while (ULONG_CMP_LT(jiffies, fqs_resume_time) && !kthread_should_stop()) { |
bf66f18e7 rcu: Add force_qu... |
908 909 910 |
schedule_timeout_interruptible(1); } fqs_burst_remaining = fqs_duration; |
93898fb1a rcu: Make rcu_tor... |
911 912 |
while (fqs_burst_remaining > 0 && !kthread_should_stop()) { |
bf66f18e7 rcu: Add force_qu... |
913 914 915 916 917 918 919 920 921 922 923 924 925 926 |
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... |
927 928 929 930 931 932 933 934 935 936 937 938 939 940 |
* 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... |
941 |
set_user_nice(current, 19); |
a241ec65a [PATCH] RCU tortu... |
942 943 |
do { schedule_timeout_uninterruptible(1); |
a71fca58b rcu: Fix whitespa... |
944 945 |
rp = rcu_torture_alloc(); if (rp == NULL) |
a241ec65a [PATCH] RCU tortu... |
946 947 948 |
continue; rp->rtort_pipe_count = 0; udelay(rcu_random(&rand) & 0x3ff); |
0ddea0ead rcu: fix sparse e... |
949 950 |
old_rp = rcu_dereference_check(rcu_torture_current, current == writer_task); |
996417d2c [PATCH] add succe... |
951 |
rp->rtort_mbtest = 1; |
a241ec65a [PATCH] RCU tortu... |
952 |
rcu_assign_pointer(rcu_torture_current, rp); |
9b2619aff rcu: Clean up cod... |
953 |
smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b1631 rcutorture: style... |
954 |
if (old_rp) { |
a241ec65a [PATCH] RCU tortu... |
955 956 957 958 959 |
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... |
960 |
cur_ops->deferred_free(old_rp); |
a241ec65a [PATCH] RCU tortu... |
961 |
} |
4a2986568 rcu: make rcutort... |
962 |
rcutorture_record_progress(++rcu_torture_current_version); |
72e9bb549 [PATCH] rcutortur... |
963 |
oldbatch = cur_ops->completed(); |
c9d557c19 rcu: fix bug in r... |
964 965 |
rcu_stutter_wait("rcu_torture_writer"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
a241ec65a [PATCH] RCU tortu... |
966 |
VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); |
c9d557c19 rcu: fix bug in r... |
967 968 |
rcutorture_shutdown_absorb("rcu_torture_writer"); while (!kthread_should_stop()) |
a241ec65a [PATCH] RCU tortu... |
969 970 971 972 973 |
schedule_timeout_uninterruptible(1); return 0; } /* |
b772e1dd4 [PATCH] RCU: add ... |
974 975 976 977 978 979 980 981 982 983 984 985 986 987 |
* 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); |
72472a02a rcu: Make rcutort... |
988 989 990 991 992 |
if (cur_ops->cb_barrier != NULL && rcu_random(&rand) % (nfakewriters * 8) == 0) cur_ops->cb_barrier(); else cur_ops->sync(); |
c9d557c19 rcu: fix bug in r... |
993 994 |
rcu_stutter_wait("rcu_torture_fakewriter"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
b772e1dd4 [PATCH] RCU: add ... |
995 996 |
VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); |
c9d557c19 rcu: fix bug in r... |
997 998 |
rcutorture_shutdown_absorb("rcu_torture_fakewriter"); while (!kthread_should_stop()) |
b772e1dd4 [PATCH] RCU: add ... |
999 1000 1001 |
schedule_timeout_uninterruptible(1); return 0; } |
91afaf300 rcu: Add failure ... |
1002 1003 1004 1005 1006 1007 1008 1009 |
void rcutorture_trace_dump(void) { static atomic_t beenhere = ATOMIC_INIT(0); if (atomic_read(&beenhere)) return; if (atomic_xchg(&beenhere, 1) != 0) return; |
91afaf300 rcu: Add failure ... |
1010 1011 |
ftrace_dump(DUMP_ALL); } |
b772e1dd4 [PATCH] RCU: add ... |
1012 |
/* |
0729fbf3b rcu: make rcutort... |
1013 1014 1015 1016 1017 1018 1019 1020 1021 |
* 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; |
524945351 rcu: Reduce rcuto... |
1022 |
int completed_end; |
0729fbf3b rcu: make rcutort... |
1023 1024 1025 1026 |
static DEFINE_RCU_RANDOM(rand); static DEFINE_SPINLOCK(rand_lock); struct rcu_torture *p; int pipe_count; |
524945351 rcu: Reduce rcuto... |
1027 |
unsigned long long ts; |
0729fbf3b rcu: make rcutort... |
1028 1029 1030 |
idx = cur_ops->readlock(); completed = cur_ops->completed(); |
e4aa0da39 rcu: Allow rcutor... |
1031 |
ts = rcu_trace_clock_local(); |
632ee2001 rcu: Introduce lo... |
1032 |
p = rcu_dereference_check(rcu_torture_current, |
632ee2001 rcu: Introduce lo... |
1033 1034 1035 |
rcu_read_lock_bh_held() || rcu_read_lock_sched_held() || srcu_read_lock_held(&srcu_ctl)); |
0729fbf3b rcu: make rcutort... |
1036 1037 1038 1039 1040 1041 1042 1043 |
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... |
1044 |
cur_ops->read_delay(&rand); |
0729fbf3b rcu: make rcutort... |
1045 1046 1047 1048 1049 1050 1051 1052 |
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; } |
524945351 rcu: Reduce rcuto... |
1053 1054 |
completed_end = cur_ops->completed(); if (pipe_count > 1) { |
524945351 rcu: Reduce rcuto... |
1055 1056 |
do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, completed, completed_end); |
91afaf300 rcu: Add failure ... |
1057 |
rcutorture_trace_dump(); |
524945351 rcu: Reduce rcuto... |
1058 |
} |
dd17c8f72 percpu: remove pe... |
1059 |
__this_cpu_inc(rcu_torture_count[pipe_count]); |
524945351 rcu: Reduce rcuto... |
1060 |
completed = completed_end - completed; |
0729fbf3b rcu: make rcutort... |
1061 1062 1063 1064 |
if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } |
dd17c8f72 percpu: remove pe... |
1065 |
__this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3b rcu: make rcutort... |
1066 1067 1068 1069 1070 |
preempt_enable(); cur_ops->readunlock(idx); } /* |
a241ec65a [PATCH] RCU tortu... |
1071 1072 1073 1074 1075 1076 1077 1078 1079 |
* 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; |
524945351 rcu: Reduce rcuto... |
1080 |
int completed_end; |
72e9bb549 [PATCH] rcutortur... |
1081 |
int idx; |
a241ec65a [PATCH] RCU tortu... |
1082 1083 1084 |
DEFINE_RCU_RANDOM(rand); struct rcu_torture *p; int pipe_count; |
0729fbf3b rcu: make rcutort... |
1085 |
struct timer_list t; |
524945351 rcu: Reduce rcuto... |
1086 |
unsigned long long ts; |
a241ec65a [PATCH] RCU tortu... |
1087 1088 |
VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); |
dbdf65b1b [PATCH] rcutortur... |
1089 |
set_user_nice(current, 19); |
0acc512cb rcu: Add synchron... |
1090 |
if (irqreader && cur_ops->irq_capable) |
0729fbf3b rcu: make rcutort... |
1091 |
setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1b [PATCH] rcutortur... |
1092 |
|
a241ec65a [PATCH] RCU tortu... |
1093 |
do { |
0acc512cb rcu: Add synchron... |
1094 |
if (irqreader && cur_ops->irq_capable) { |
0729fbf3b rcu: make rcutort... |
1095 |
if (!timer_pending(&t)) |
6155fec92 rcu: Fix rcutortu... |
1096 |
mod_timer(&t, jiffies + 1); |
0729fbf3b rcu: make rcutort... |
1097 |
} |
72e9bb549 [PATCH] rcutortur... |
1098 1099 |
idx = cur_ops->readlock(); completed = cur_ops->completed(); |
e4aa0da39 rcu: Allow rcutor... |
1100 |
ts = rcu_trace_clock_local(); |
632ee2001 rcu: Introduce lo... |
1101 |
p = rcu_dereference_check(rcu_torture_current, |
632ee2001 rcu: Introduce lo... |
1102 1103 1104 |
rcu_read_lock_bh_held() || rcu_read_lock_sched_held() || srcu_read_lock_held(&srcu_ctl)); |
a241ec65a [PATCH] RCU tortu... |
1105 1106 |
if (p == NULL) { /* Wait for rcu_torture_writer to get underway */ |
72e9bb549 [PATCH] rcutortur... |
1107 |
cur_ops->readunlock(idx); |
a241ec65a [PATCH] RCU tortu... |
1108 1109 1110 |
schedule_timeout_interruptible(HZ); continue; } |
996417d2c [PATCH] add succe... |
1111 1112 |
if (p->rtort_mbtest == 0) atomic_inc(&n_rcu_torture_mberror); |
0acc512cb rcu: Add synchron... |
1113 |
cur_ops->read_delay(&rand); |
a241ec65a [PATCH] RCU tortu... |
1114 1115 1116 1117 1118 1119 |
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; } |
524945351 rcu: Reduce rcuto... |
1120 1121 |
completed_end = cur_ops->completed(); if (pipe_count > 1) { |
524945351 rcu: Reduce rcuto... |
1122 1123 |
do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, completed, completed_end); |
91afaf300 rcu: Add failure ... |
1124 |
rcutorture_trace_dump(); |
524945351 rcu: Reduce rcuto... |
1125 |
} |
dd17c8f72 percpu: remove pe... |
1126 |
__this_cpu_inc(rcu_torture_count[pipe_count]); |
524945351 rcu: Reduce rcuto... |
1127 |
completed = completed_end - completed; |
a241ec65a [PATCH] RCU tortu... |
1128 1129 1130 1131 |
if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } |
dd17c8f72 percpu: remove pe... |
1132 |
__this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65a [PATCH] RCU tortu... |
1133 |
preempt_enable(); |
72e9bb549 [PATCH] rcutortur... |
1134 |
cur_ops->readunlock(idx); |
a241ec65a [PATCH] RCU tortu... |
1135 |
schedule(); |
c9d557c19 rcu: fix bug in r... |
1136 1137 |
rcu_stutter_wait("rcu_torture_reader"); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); |
a241ec65a [PATCH] RCU tortu... |
1138 |
VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); |
c9d557c19 rcu: fix bug in r... |
1139 |
rcutorture_shutdown_absorb("rcu_torture_reader"); |
0acc512cb rcu: Add synchron... |
1140 |
if (irqreader && cur_ops->irq_capable) |
0729fbf3b rcu: make rcutort... |
1141 |
del_timer_sync(&t); |
c9d557c19 rcu: fix bug in r... |
1142 |
while (!kthread_should_stop()) |
a241ec65a [PATCH] RCU tortu... |
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 |
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_... |
1158 |
for_each_possible_cpu(cpu) { |
a241ec65a [PATCH] RCU tortu... |
1159 1160 1161 1162 1163 1164 1165 1166 1167 |
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... |
1168 |
cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
1169 |
cnt += sprintf(&page[cnt], |
5cf05ad75 rcu: Fix broken s... |
1170 |
"rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", |
a241ec65a [PATCH] RCU tortu... |
1171 1172 1173 1174 1175 |
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), |
5cf05ad75 rcu: Fix broken s... |
1176 1177 |
atomic_read(&n_rcu_torture_free)); cnt += sprintf(&page[cnt], "rtmbe: %d rtbke: %ld rtbre: %ld ", |
0729fbf3b rcu: make rcutort... |
1178 |
atomic_read(&n_rcu_torture_mberror), |
8e8be45e8 rcu: add priority... |
1179 |
n_rcu_torture_boost_ktrerror, |
5cf05ad75 rcu: Fix broken s... |
1180 1181 |
n_rcu_torture_boost_rterror); cnt += sprintf(&page[cnt], "rtbf: %ld rtb: %ld nt: %ld ", |
8e8be45e8 rcu: add priority... |
1182 1183 |
n_rcu_torture_boost_failure, n_rcu_torture_boosts, |
5cf05ad75 rcu: Fix broken s... |
1184 |
n_rcu_torture_timers); |
13dbf9140 rcu: Track CPU-ho... |
1185 1186 1187 1188 1189 1190 1191 |
cnt += sprintf(&page[cnt], "onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ", n_online_successes, n_online_attempts, n_offline_successes, n_offline_attempts, min_online, max_online, min_offline, max_offline, sum_online, sum_offline, HZ); |
5cf05ad75 rcu: Fix broken s... |
1192 |
cnt += sprintf(&page[cnt], "barrier: %ld/%ld:%ld", |
fae4b54f2 rcu: Introduce rc... |
1193 1194 1195 1196 1197 |
n_barrier_successes, n_barrier_attempts, n_rcu_torture_barrier_error); cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
8e8be45e8 rcu: add priority... |
1198 |
if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f2 rcu: Introduce rc... |
1199 |
n_rcu_torture_barrier_error != 0 || |
8e8be45e8 rcu: add priority... |
1200 1201 |
n_rcu_torture_boost_ktrerror != 0 || n_rcu_torture_boost_rterror != 0 || |
fae4b54f2 rcu: Introduce rc... |
1202 1203 |
n_rcu_torture_boost_failure != 0 || i > 1) { |
a241ec65a [PATCH] RCU tortu... |
1204 |
cnt += sprintf(&page[cnt], "!!! "); |
996417d2c [PATCH] add succe... |
1205 |
atomic_inc(&n_rcu_torture_error); |
5af970a48 rcutorture: WARN_... |
1206 |
WARN_ON_ONCE(1); |
996417d2c [PATCH] add succe... |
1207 |
} |
a241ec65a [PATCH] RCU tortu... |
1208 1209 1210 |
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... |
1211 1212 |
cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
1213 |
cnt += sprintf(&page[cnt], "Reader Batch: "); |
72e9bb549 [PATCH] rcutortur... |
1214 |
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
a241ec65a [PATCH] RCU tortu... |
1215 |
cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); |
72e9bb549 [PATCH] rcutortur... |
1216 1217 |
cnt += sprintf(&page[cnt], " %s%s ", torture_type, TORTURE_FLAG); |
a241ec65a [PATCH] RCU tortu... |
1218 1219 1220 1221 1222 1223 1224 |
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... |
1225 |
if (cur_ops->stats) |
72e9bb549 [PATCH] rcutortur... |
1226 |
cnt += cur_ops->stats(&page[cnt]); |
a241ec65a [PATCH] RCU tortu... |
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 |
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); |
2caa1e443 rcu: Switch rcuto... |
1244 |
pr_alert("%s", printk_buf); |
a241ec65a [PATCH] RCU tortu... |
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 |
} /* * 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... |
1261 1262 |
rcutorture_shutdown_absorb("rcu_torture_stats"); } while (!kthread_should_stop()); |
a241ec65a [PATCH] RCU tortu... |
1263 1264 1265 |
VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); return 0; } |
d84f52034 [PATCH] Extend RC... |
1266 1267 1268 1269 1270 |
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... |
1271 |
static void rcu_torture_shuffle_tasks(void) |
d84f52034 [PATCH] Extend RC... |
1272 |
{ |
d84f52034 [PATCH] Extend RC... |
1273 |
int i; |
73d0a4b10 cpumask: convert ... |
1274 |
cpumask_setall(shuffle_tmp_mask); |
86ef5c9a8 cpu-hotplug: repl... |
1275 |
get_online_cpus(); |
d84f52034 [PATCH] Extend RC... |
1276 1277 |
/* No point in shuffling if there is only one online CPU (ex: UP) */ |
c9d557c19 rcu: fix bug in r... |
1278 1279 1280 1281 |
if (num_online_cpus() == 1) { put_online_cpus(); return; } |
d84f52034 [PATCH] Extend RC... |
1282 1283 |
if (rcu_idle_cpu != -1) |
73d0a4b10 cpumask: convert ... |
1284 |
cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1285 |
|
73d0a4b10 cpumask: convert ... |
1286 |
set_cpus_allowed_ptr(current, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1287 |
|
c8e5b1631 rcutorture: style... |
1288 |
if (reader_tasks) { |
d84f52034 [PATCH] Extend RC... |
1289 1290 |
for (i = 0; i < nrealreaders; i++) if (reader_tasks[i]) |
f70316dac generic: use new ... |
1291 |
set_cpus_allowed_ptr(reader_tasks[i], |
73d0a4b10 cpumask: convert ... |
1292 |
shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1293 |
} |
c8e5b1631 rcutorture: style... |
1294 |
if (fakewriter_tasks) { |
b772e1dd4 [PATCH] RCU: add ... |
1295 1296 |
for (i = 0; i < nfakewriters; i++) if (fakewriter_tasks[i]) |
f70316dac generic: use new ... |
1297 |
set_cpus_allowed_ptr(fakewriter_tasks[i], |
73d0a4b10 cpumask: convert ... |
1298 |
shuffle_tmp_mask); |
b772e1dd4 [PATCH] RCU: add ... |
1299 |
} |
d84f52034 [PATCH] Extend RC... |
1300 |
if (writer_task) |
73d0a4b10 cpumask: convert ... |
1301 |
set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1302 |
if (stats_task) |
73d0a4b10 cpumask: convert ... |
1303 |
set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); |
0e11c8e8a rcu: Make rcutort... |
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 |
if (stutter_task) set_cpus_allowed_ptr(stutter_task, shuffle_tmp_mask); if (fqs_task) set_cpus_allowed_ptr(fqs_task, shuffle_tmp_mask); if (shutdown_task) set_cpus_allowed_ptr(shutdown_task, shuffle_tmp_mask); #ifdef CONFIG_HOTPLUG_CPU if (onoff_task) set_cpus_allowed_ptr(onoff_task, shuffle_tmp_mask); #endif /* #ifdef CONFIG_HOTPLUG_CPU */ if (stall_task) set_cpus_allowed_ptr(stall_task, shuffle_tmp_mask); if (barrier_cbs_tasks) for (i = 0; i < n_barrier_cbs; i++) if (barrier_cbs_tasks[i]) set_cpus_allowed_ptr(barrier_cbs_tasks[i], shuffle_tmp_mask); if (barrier_task) set_cpus_allowed_ptr(barrier_task, shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1323 1324 1325 1326 1327 |
if (rcu_idle_cpu == -1) rcu_idle_cpu = num_online_cpus() - 1; else rcu_idle_cpu--; |
86ef5c9a8 cpu-hotplug: repl... |
1328 |
put_online_cpus(); |
d84f52034 [PATCH] Extend RC... |
1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 |
} /* 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... |
1342 1343 |
rcutorture_shutdown_absorb("rcu_torture_shuffle"); } while (!kthread_should_stop()); |
d84f52034 [PATCH] Extend RC... |
1344 1345 1346 |
VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); return 0; } |
d120f65f3 rcu: make rcutort... |
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 |
/* 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... |
1357 |
if (!kthread_should_stop()) |
d120f65f3 rcu: make rcutort... |
1358 1359 |
schedule_timeout_interruptible(stutter * HZ); stutter_pause_test = 0; |
c9d557c19 rcu: fix bug in r... |
1360 1361 |
rcutorture_shutdown_absorb("rcu_torture_stutter"); } while (!kthread_should_stop()); |
d120f65f3 rcu: make rcutort... |
1362 1363 1364 |
VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); return 0; } |
95c383227 [PATCH] rcutortur... |
1365 |
static inline void |
8e8be45e8 rcu: add priority... |
1366 |
rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, char *tag) |
95c383227 [PATCH] rcutortur... |
1367 |
{ |
2caa1e443 rcu: Switch rcuto... |
1368 1369 1370 1371 1372 1373 1374 |
pr_alert("%s" TORTURE_FLAG "--- %s: nreaders=%d nfakewriters=%d " "stat_interval=%d verbose=%d test_no_idle_hz=%d " "shuffle_interval=%d stutter=%d irqreader=%d " "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " "test_boost=%d/%d test_boost_interval=%d " "test_boost_duration=%d shutdown_secs=%d " |
67afeed2c rcu: Add new rcut... |
1375 1376 |
"stall_cpu=%d stall_cpu_holdoff=%d " "n_barrier_cbs=%d " |
2caa1e443 rcu: Switch rcuto... |
1377 1378 1379 1380 1381 1382 1383 |
"onoff_interval=%d onoff_holdoff=%d ", torture_type, tag, nrealreaders, nfakewriters, stat_interval, verbose, test_no_idle_hz, shuffle_interval, stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, test_boost, cur_ops->can_boost, test_boost_interval, test_boost_duration, shutdown_secs, |
67afeed2c rcu: Add new rcut... |
1384 1385 |
stall_cpu, stall_cpu_holdoff, n_barrier_cbs, |
2caa1e443 rcu: Switch rcuto... |
1386 |
onoff_interval, onoff_holdoff); |
95c383227 [PATCH] rcutortur... |
1387 |
} |
8e8be45e8 rcu: add priority... |
1388 |
static struct notifier_block rcutorture_shutdown_nb = { |
343e9099c rcu: fix rcutortu... |
1389 1390 |
.notifier_call = rcutorture_shutdown_notify, }; |
8e8be45e8 rcu: add priority... |
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 |
static void rcutorture_booster_cleanup(int cpu) { struct task_struct *t; if (boost_tasks[cpu] == NULL) return; mutex_lock(&boost_mutex); VERBOSE_PRINTK_STRING("Stopping rcu_torture_boost task"); t = boost_tasks[cpu]; boost_tasks[cpu] = NULL; mutex_unlock(&boost_mutex); /* This must be outside of the mutex, otherwise deadlock! */ kthread_stop(t); |
37e377d28 rcu: Fixes to rcu... |
1405 |
boost_tasks[cpu] = NULL; |
8e8be45e8 rcu: add priority... |
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 |
} static int rcutorture_booster_init(int cpu) { int retval; if (boost_tasks[cpu] != NULL) return 0; /* Already created, nothing more to do. */ /* Don't allow time recalculation while creating a new task. */ mutex_lock(&boost_mutex); VERBOSE_PRINTK_STRING("Creating rcu_torture_boost task"); |
1f2880948 rcu: Use kthread_... |
1418 1419 1420 |
boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, cpu_to_node(cpu), "rcu_torture_boost"); |
8e8be45e8 rcu: add priority... |
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 |
if (IS_ERR(boost_tasks[cpu])) { retval = PTR_ERR(boost_tasks[cpu]); VERBOSE_PRINTK_STRING("rcu_torture_boost task create failed"); n_rcu_torture_boost_ktrerror++; boost_tasks[cpu] = NULL; mutex_unlock(&boost_mutex); return retval; } kthread_bind(boost_tasks[cpu], cpu); wake_up_process(boost_tasks[cpu]); mutex_unlock(&boost_mutex); return 0; } |
d5f546d83 rcu: Add rcutortu... |
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 |
/* * Cause the rcutorture test to shutdown the system after the test has * run for the time specified by the shutdown_secs module parameter. */ static int rcu_torture_shutdown(void *arg) { long delta; unsigned long jiffies_snap; VERBOSE_PRINTK_STRING("rcu_torture_shutdown task started"); jiffies_snap = ACCESS_ONCE(jiffies); while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && !kthread_should_stop()) { delta = shutdown_time - jiffies_snap; if (verbose) |
2caa1e443 rcu: Switch rcuto... |
1450 1451 1452 1453 |
pr_alert("%s" TORTURE_FLAG "rcu_torture_shutdown task: %lu jiffies remaining ", torture_type, delta); |
d5f546d83 rcu: Add rcutortu... |
1454 1455 1456 |
schedule_timeout_interruptible(delta); jiffies_snap = ACCESS_ONCE(jiffies); } |
b58bdccaa rcu: Add rcutortu... |
1457 |
if (kthread_should_stop()) { |
d5f546d83 rcu: Add rcutortu... |
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 |
VERBOSE_PRINTK_STRING("rcu_torture_shutdown task stopping"); return 0; } /* OK, shut down the system. */ VERBOSE_PRINTK_STRING("rcu_torture_shutdown task shutting down system"); shutdown_task = NULL; /* Avoid self-kill deadlock. */ rcu_torture_cleanup(); /* Get the success/failure message. */ kernel_power_off(); /* Shut down the system. */ return 0; } |
b58bdccaa rcu: Add rcutortu... |
1470 1471 1472 1473 1474 1475 |
#ifdef CONFIG_HOTPLUG_CPU /* * Execute random CPU-hotplug operations at the interval specified * by the onoff_interval. */ |
441003064 rcu: Add missing ... |
1476 |
static int __cpuinit |
b58bdccaa rcu: Add rcutortu... |
1477 1478 1479 |
rcu_torture_onoff(void *arg) { int cpu; |
13dbf9140 rcu: Track CPU-ho... |
1480 |
unsigned long delta; |
b58bdccaa rcu: Add rcutortu... |
1481 1482 |
int maxcpu = -1; DEFINE_RCU_RANDOM(rand); |
489832609 rcu: Make rcutort... |
1483 |
int ret; |
13dbf9140 rcu: Track CPU-ho... |
1484 |
unsigned long starttime; |
b58bdccaa rcu: Add rcutortu... |
1485 1486 1487 1488 1489 |
VERBOSE_PRINTK_STRING("rcu_torture_onoff task started"); for_each_online_cpu(cpu) maxcpu = cpu; WARN_ON(maxcpu < 0); |
9b9ec9b90 rcutorture: Permi... |
1490 1491 1492 1493 1494 |
if (onoff_holdoff > 0) { VERBOSE_PRINTK_STRING("rcu_torture_onoff begin holdoff"); schedule_timeout_interruptible(onoff_holdoff * HZ); VERBOSE_PRINTK_STRING("rcu_torture_onoff end holdoff"); } |
b58bdccaa rcu: Add rcutortu... |
1495 1496 |
while (!kthread_should_stop()) { cpu = (rcu_random(&rand) >> 4) % (maxcpu + 1); |
f220242af rcu: Make rcutort... |
1497 |
if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) { |
b58bdccaa rcu: Add rcutortu... |
1498 |
if (verbose) |
2caa1e443 rcu: Switch rcuto... |
1499 1500 1501 1502 |
pr_alert("%s" TORTURE_FLAG "rcu_torture_onoff task: offlining %d ", torture_type, cpu); |
13dbf9140 rcu: Track CPU-ho... |
1503 |
starttime = jiffies; |
b58bdccaa rcu: Add rcutortu... |
1504 |
n_offline_attempts++; |
489832609 rcu: Make rcutort... |
1505 1506 1507 1508 1509 1510 1511 1512 |
ret = cpu_down(cpu); if (ret) { if (verbose) pr_alert("%s" TORTURE_FLAG "rcu_torture_onoff task: offline %d failed: errno %d ", torture_type, cpu, ret); } else { |
b58bdccaa rcu: Add rcutortu... |
1513 |
if (verbose) |
2caa1e443 rcu: Switch rcuto... |
1514 1515 1516 1517 |
pr_alert("%s" TORTURE_FLAG "rcu_torture_onoff task: offlined %d ", torture_type, cpu); |
b58bdccaa rcu: Add rcutortu... |
1518 |
n_offline_successes++; |
13dbf9140 rcu: Track CPU-ho... |
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 |
delta = jiffies - starttime; sum_offline += delta; if (min_offline < 0) { min_offline = delta; max_offline = delta; } if (min_offline > delta) min_offline = delta; if (max_offline < delta) max_offline = delta; |
b58bdccaa rcu: Add rcutortu... |
1529 |
} |
f220242af rcu: Make rcutort... |
1530 |
} else if (cpu_is_hotpluggable(cpu)) { |
b58bdccaa rcu: Add rcutortu... |
1531 |
if (verbose) |
2caa1e443 rcu: Switch rcuto... |
1532 1533 1534 1535 |
pr_alert("%s" TORTURE_FLAG "rcu_torture_onoff task: onlining %d ", torture_type, cpu); |
13dbf9140 rcu: Track CPU-ho... |
1536 |
starttime = jiffies; |
b58bdccaa rcu: Add rcutortu... |
1537 1538 1539 |
n_online_attempts++; if (cpu_up(cpu) == 0) { if (verbose) |
2caa1e443 rcu: Switch rcuto... |
1540 1541 1542 1543 |
pr_alert("%s" TORTURE_FLAG "rcu_torture_onoff task: onlined %d ", torture_type, cpu); |
b58bdccaa rcu: Add rcutortu... |
1544 |
n_online_successes++; |
13dbf9140 rcu: Track CPU-ho... |
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 |
delta = jiffies - starttime; sum_online += delta; if (min_online < 0) { min_online = delta; max_online = delta; } if (min_online > delta) min_online = delta; if (max_online < delta) max_online = delta; |
b58bdccaa rcu: Add rcutortu... |
1555 1556 1557 1558 1559 1560 1561 |
} } schedule_timeout_interruptible(onoff_interval * HZ); } VERBOSE_PRINTK_STRING("rcu_torture_onoff task stopping"); return 0; } |
441003064 rcu: Add missing ... |
1562 |
static int __cpuinit |
b58bdccaa rcu: Add rcutortu... |
1563 1564 |
rcu_torture_onoff_init(void) { |
3c1b1ce00 PTR_ERR should be... |
1565 |
int ret; |
b58bdccaa rcu: Add rcutortu... |
1566 1567 1568 1569 |
if (onoff_interval <= 0) return 0; onoff_task = kthread_run(rcu_torture_onoff, NULL, "rcu_torture_onoff"); if (IS_ERR(onoff_task)) { |
3c1b1ce00 PTR_ERR should be... |
1570 |
ret = PTR_ERR(onoff_task); |
b58bdccaa rcu: Add rcutortu... |
1571 |
onoff_task = NULL; |
3c1b1ce00 PTR_ERR should be... |
1572 |
return ret; |
b58bdccaa rcu: Add rcutortu... |
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 |
} return 0; } static void rcu_torture_onoff_cleanup(void) { if (onoff_task == NULL) return; VERBOSE_PRINTK_STRING("Stopping rcu_torture_onoff task"); kthread_stop(onoff_task); |
37e377d28 rcu: Fixes to rcu... |
1583 |
onoff_task = NULL; |
b58bdccaa rcu: Add rcutortu... |
1584 1585 1586 |
} #else /* #ifdef CONFIG_HOTPLUG_CPU */ |
37e377d28 rcu: Fixes to rcu... |
1587 |
static int |
b58bdccaa rcu: Add rcutortu... |
1588 1589 |
rcu_torture_onoff_init(void) { |
37e377d28 rcu: Fixes to rcu... |
1590 |
return 0; |
b58bdccaa rcu: Add rcutortu... |
1591 1592 1593 1594 1595 1596 1597 |
} static void rcu_torture_onoff_cleanup(void) { } #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ |
c13f3757d rcu: Add CPU-stal... |
1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 |
/* * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then * induces a CPU stall for the time specified by stall_cpu. */ static int __cpuinit rcu_torture_stall(void *args) { unsigned long stop_at; VERBOSE_PRINTK_STRING("rcu_torture_stall task started"); if (stall_cpu_holdoff > 0) { VERBOSE_PRINTK_STRING("rcu_torture_stall begin holdoff"); schedule_timeout_interruptible(stall_cpu_holdoff * HZ); VERBOSE_PRINTK_STRING("rcu_torture_stall end holdoff"); } if (!kthread_should_stop()) { stop_at = get_seconds() + stall_cpu; /* RCU CPU stall is expected behavior in following code. */ |
2caa1e443 rcu: Switch rcuto... |
1615 1616 |
pr_alert("rcu_torture_stall start. "); |
c13f3757d rcu: Add CPU-stal... |
1617 1618 1619 1620 1621 1622 |
rcu_read_lock(); preempt_disable(); while (ULONG_CMP_LT(get_seconds(), stop_at)) continue; /* Induce RCU CPU stall warning. */ preempt_enable(); rcu_read_unlock(); |
2caa1e443 rcu: Switch rcuto... |
1623 1624 |
pr_alert("rcu_torture_stall end. "); |
c13f3757d rcu: Add CPU-stal... |
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 |
} rcutorture_shutdown_absorb("rcu_torture_stall"); while (!kthread_should_stop()) schedule_timeout_interruptible(10 * HZ); return 0; } /* Spawn CPU-stall kthread, if stall_cpu specified. */ static int __init rcu_torture_stall_init(void) { int ret; if (stall_cpu <= 0) return 0; stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall"); if (IS_ERR(stall_task)) { ret = PTR_ERR(stall_task); stall_task = NULL; return ret; } return 0; } /* Clean up after the CPU-stall kthread, if one was spawned. */ static void rcu_torture_stall_cleanup(void) { if (stall_task == NULL) return; VERBOSE_PRINTK_STRING("Stopping rcu_torture_stall_task."); kthread_stop(stall_task); |
37e377d28 rcu: Fixes to rcu... |
1655 |
stall_task = NULL; |
c13f3757d rcu: Add CPU-stal... |
1656 |
} |
fae4b54f2 rcu: Introduce rc... |
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 |
/* Callback function for RCU barrier testing. */ void rcu_torture_barrier_cbf(struct rcu_head *rcu) { atomic_inc(&barrier_cbs_invoked); } /* kthread function to register callbacks used to test RCU barriers. */ static int rcu_torture_barrier_cbs(void *arg) { long myid = (long)arg; |
c6ebcbb60 rcu: Fix bug in r... |
1667 |
bool lastphase = 0; |
fae4b54f2 rcu: Introduce rc... |
1668 1669 1670 1671 1672 1673 1674 |
struct rcu_head rcu; init_rcu_head_on_stack(&rcu); VERBOSE_PRINTK_STRING("rcu_torture_barrier_cbs task started"); set_user_nice(current, 19); do { wait_event(barrier_cbs_wq[myid], |
c6ebcbb60 rcu: Fix bug in r... |
1675 |
barrier_phase != lastphase || |
fae4b54f2 rcu: Introduce rc... |
1676 1677 |
kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP); |
c6ebcbb60 rcu: Fix bug in r... |
1678 1679 |
lastphase = barrier_phase; smp_mb(); /* ensure barrier_phase load before ->call(). */ |
fae4b54f2 rcu: Introduce rc... |
1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 |
if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) break; cur_ops->call(&rcu, rcu_torture_barrier_cbf); if (atomic_dec_and_test(&barrier_cbs_count)) wake_up(&barrier_wq); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); VERBOSE_PRINTK_STRING("rcu_torture_barrier_cbs task stopping"); rcutorture_shutdown_absorb("rcu_torture_barrier_cbs"); while (!kthread_should_stop()) schedule_timeout_interruptible(1); cur_ops->cb_barrier(); destroy_rcu_head_on_stack(&rcu); return 0; } /* kthread function to drive and coordinate RCU barrier testing. */ static int rcu_torture_barrier(void *arg) { int i; VERBOSE_PRINTK_STRING("rcu_torture_barrier task starting"); do { atomic_set(&barrier_cbs_invoked, 0); atomic_set(&barrier_cbs_count, n_barrier_cbs); |
c6ebcbb60 rcu: Fix bug in r... |
1704 1705 |
smp_mb(); /* Ensure barrier_phase after prior assignments. */ barrier_phase = !barrier_phase; |
fae4b54f2 rcu: Introduce rc... |
1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 |
for (i = 0; i < n_barrier_cbs; i++) wake_up(&barrier_cbs_wq[i]); wait_event(barrier_wq, atomic_read(&barrier_cbs_count) == 0 || kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP); if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) break; n_barrier_attempts++; cur_ops->cb_barrier(); if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { n_rcu_torture_barrier_error++; WARN_ON_ONCE(1); } n_barrier_successes++; schedule_timeout_interruptible(HZ / 10); } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); VERBOSE_PRINTK_STRING("rcu_torture_barrier task stopping"); |
143aa672f rcu: Fix diagnost... |
1724 |
rcutorture_shutdown_absorb("rcu_torture_barrier"); |
fae4b54f2 rcu: Introduce rc... |
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 |
while (!kthread_should_stop()) schedule_timeout_interruptible(1); return 0; } /* Initialize RCU barrier testing. */ static int rcu_torture_barrier_init(void) { int i; int ret; if (n_barrier_cbs == 0) return 0; if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { |
2caa1e443 rcu: Switch rcuto... |
1739 1740 1741 1742 1743 1744 1745 1746 |
pr_alert("%s" TORTURE_FLAG " Call or barrier ops missing for %s, ", torture_type, cur_ops->name); pr_alert("%s" TORTURE_FLAG " RCU barrier testing omitted from run. ", torture_type); |
fae4b54f2 rcu: Introduce rc... |
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 |
return 0; } atomic_set(&barrier_cbs_count, 0); atomic_set(&barrier_cbs_invoked, 0); barrier_cbs_tasks = kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), GFP_KERNEL); barrier_cbs_wq = kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), GFP_KERNEL); |
de5e64378 rcutorture: Don't... |
1757 |
if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f2 rcu: Introduce rc... |
1758 1759 1760 1761 |
return -ENOMEM; for (i = 0; i < n_barrier_cbs; i++) { init_waitqueue_head(&barrier_cbs_wq[i]); barrier_cbs_tasks[i] = kthread_run(rcu_torture_barrier_cbs, |
9059c9401 rcu: Add rcutortu... |
1762 |
(void *)(long)i, |
fae4b54f2 rcu: Introduce rc... |
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 |
"rcu_torture_barrier_cbs"); if (IS_ERR(barrier_cbs_tasks[i])) { ret = PTR_ERR(barrier_cbs_tasks[i]); VERBOSE_PRINTK_ERRSTRING("Failed to create rcu_torture_barrier_cbs"); barrier_cbs_tasks[i] = NULL; return ret; } } barrier_task = kthread_run(rcu_torture_barrier, NULL, "rcu_torture_barrier"); if (IS_ERR(barrier_task)) { ret = PTR_ERR(barrier_task); VERBOSE_PRINTK_ERRSTRING("Failed to create rcu_torture_barrier"); barrier_task = NULL; } return 0; } /* Clean up after RCU barrier testing. */ static void rcu_torture_barrier_cleanup(void) { int i; if (barrier_task != NULL) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_barrier task"); kthread_stop(barrier_task); barrier_task = NULL; } if (barrier_cbs_tasks != NULL) { for (i = 0; i < n_barrier_cbs; i++) { if (barrier_cbs_tasks[i] != NULL) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_barrier_cbs task"); kthread_stop(barrier_cbs_tasks[i]); barrier_cbs_tasks[i] = NULL; } } kfree(barrier_cbs_tasks); barrier_cbs_tasks = NULL; } if (barrier_cbs_wq != NULL) { kfree(barrier_cbs_wq); barrier_cbs_wq = NULL; } } |
8e8be45e8 rcu: add priority... |
1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 |
static int rcutorture_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) { long cpu = (long)hcpu; switch (action) { case CPU_ONLINE: case CPU_DOWN_FAILED: (void)rcutorture_booster_init(cpu); break; case CPU_DOWN_PREPARE: rcutorture_booster_cleanup(cpu); break; default: break; } return NOTIFY_OK; } static struct notifier_block rcutorture_cpu_nb = { .notifier_call = rcutorture_cpu_notify, }; |
a241ec65a [PATCH] RCU tortu... |
1829 1830 1831 1832 |
static void rcu_torture_cleanup(void) { int i; |
343e9099c rcu: fix rcutortu... |
1833 |
mutex_lock(&fullstop_mutex); |
4a2986568 rcu: make rcutort... |
1834 |
rcutorture_record_test_transition(); |
c9d557c19 rcu: fix bug in r... |
1835 |
if (fullstop == FULLSTOP_SHUTDOWN) { |
2caa1e443 rcu: Switch rcuto... |
1836 |
pr_warn(/* but going down anyway, so... */ |
c9d557c19 rcu: fix bug in r... |
1837 1838 |
"Concurrent 'rmmod rcutorture' and shutdown illegal! "); |
343e9099c rcu: fix rcutortu... |
1839 |
mutex_unlock(&fullstop_mutex); |
c9d557c19 rcu: fix bug in r... |
1840 |
schedule_timeout_uninterruptible(10); |
343e9099c rcu: fix rcutortu... |
1841 1842 1843 1844 |
if (cur_ops->cb_barrier != NULL) cur_ops->cb_barrier(); return; } |
c9d557c19 rcu: fix bug in r... |
1845 |
fullstop = FULLSTOP_RMMOD; |
343e9099c rcu: fix rcutortu... |
1846 |
mutex_unlock(&fullstop_mutex); |
8e8be45e8 rcu: add priority... |
1847 |
unregister_reboot_notifier(&rcutorture_shutdown_nb); |
fae4b54f2 rcu: Introduce rc... |
1848 |
rcu_torture_barrier_cleanup(); |
c13f3757d rcu: Add CPU-stal... |
1849 |
rcu_torture_stall_cleanup(); |
d120f65f3 rcu: make rcutort... |
1850 1851 1852 1853 1854 |
if (stutter_task) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); kthread_stop(stutter_task); } stutter_task = NULL; |
c8e5b1631 rcutorture: style... |
1855 |
if (shuffler_task) { |
d84f52034 [PATCH] Extend RC... |
1856 1857 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); kthread_stop(shuffler_task); |
73d0a4b10 cpumask: convert ... |
1858 |
free_cpumask_var(shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
1859 1860 |
} shuffler_task = NULL; |
c8e5b1631 rcutorture: style... |
1861 |
if (writer_task) { |
a241ec65a [PATCH] RCU tortu... |
1862 1863 1864 1865 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); kthread_stop(writer_task); } writer_task = NULL; |
c8e5b1631 rcutorture: style... |
1866 |
if (reader_tasks) { |
a241ec65a [PATCH] RCU tortu... |
1867 |
for (i = 0; i < nrealreaders; i++) { |
c8e5b1631 rcutorture: style... |
1868 |
if (reader_tasks[i]) { |
a241ec65a [PATCH] RCU tortu... |
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 |
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... |
1879 |
if (fakewriter_tasks) { |
b772e1dd4 [PATCH] RCU: add ... |
1880 |
for (i = 0; i < nfakewriters; i++) { |
c8e5b1631 rcutorture: style... |
1881 |
if (fakewriter_tasks[i]) { |
b772e1dd4 [PATCH] RCU: add ... |
1882 1883 1884 1885 1886 1887 1888 1889 1890 |
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... |
1891 |
if (stats_task) { |
a241ec65a [PATCH] RCU tortu... |
1892 1893 1894 1895 |
VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); kthread_stop(stats_task); } stats_task = NULL; |
bf66f18e7 rcu: Add force_qu... |
1896 1897 1898 1899 1900 |
if (fqs_task) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_fqs task"); kthread_stop(fqs_task); } fqs_task = NULL; |
8e8be45e8 rcu: add priority... |
1901 1902 1903 1904 1905 1906 |
if ((test_boost == 1 && cur_ops->can_boost) || test_boost == 2) { unregister_cpu_notifier(&rcutorture_cpu_nb); for_each_possible_cpu(i) rcutorture_booster_cleanup(i); } |
d5f546d83 rcu: Add rcutortu... |
1907 1908 1909 1910 |
if (shutdown_task != NULL) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_shutdown task"); kthread_stop(shutdown_task); } |
37e377d28 rcu: Fixes to rcu... |
1911 |
shutdown_task = NULL; |
b58bdccaa rcu: Add rcutortu... |
1912 |
rcu_torture_onoff_cleanup(); |
bf66f18e7 rcu: Add force_qu... |
1913 |
|
a241ec65a [PATCH] RCU tortu... |
1914 |
/* Wait for all RCU callbacks to fire. */ |
2326974df rcu: add call_rcu... |
1915 1916 1917 |
if (cur_ops->cb_barrier != NULL) cur_ops->cb_barrier(); |
a241ec65a [PATCH] RCU tortu... |
1918 |
|
a241ec65a [PATCH] RCU tortu... |
1919 |
rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb549 [PATCH] rcutortur... |
1920 |
|
fae4b54f2 rcu: Introduce rc... |
1921 |
if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e8 rcu: add priority... |
1922 |
rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
091541bbd rcu: Make rcutort... |
1923 1924 1925 1926 |
else if (n_online_successes != n_online_attempts || n_offline_successes != n_offline_attempts) rcu_torture_print_module_parms(cur_ops, "End of test: RCU_HOTPLUG"); |
95c383227 [PATCH] rcutortur... |
1927 |
else |
8e8be45e8 rcu: add priority... |
1928 |
rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
a241ec65a [PATCH] RCU tortu... |
1929 |
} |
6f8bc500a rcutorture: Mark ... |
1930 |
static int __init |
a241ec65a [PATCH] RCU tortu... |
1931 1932 1933 1934 1935 |
rcu_torture_init(void) { int i; int cpu; int firsterr = 0; |
fae4b54f2 rcu: Introduce rc... |
1936 |
int retval; |
ade5fb818 rcutorture: Remov... |
1937 |
static struct rcu_torture_ops *torture_ops[] = |
d9a3da069 rcu: Add expedite... |
1938 |
{ &rcu_ops, &rcu_sync_ops, &rcu_expedited_ops, |
bdf2a4364 rcu: Catch rcutor... |
1939 |
&rcu_bh_ops, &rcu_bh_sync_ops, &rcu_bh_expedited_ops, |
751a68b2e rcu: Rationalize ... |
1940 1941 |
&srcu_ops, &srcu_sync_ops, &srcu_expedited_ops, &srcu_raw_ops, &srcu_raw_sync_ops, |
804bb8370 rcu: Add synchron... |
1942 |
&sched_ops, &sched_sync_ops, &sched_expedited_ops, }; |
a241ec65a [PATCH] RCU tortu... |
1943 |
|
343e9099c rcu: fix rcutortu... |
1944 |
mutex_lock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
1945 |
/* Process args and tell the world that the torturer is on the job. */ |
ade5fb818 rcutorture: Remov... |
1946 |
for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb549 [PATCH] rcutortur... |
1947 |
cur_ops = torture_ops[i]; |
ade5fb818 rcutorture: Remov... |
1948 |
if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb549 [PATCH] rcutortur... |
1949 |
break; |
72e9bb549 [PATCH] rcutortur... |
1950 |
} |
ade5fb818 rcutorture: Remov... |
1951 |
if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e443 rcu: Switch rcuto... |
1952 1953 1954 1955 |
pr_alert("rcu-torture: invalid torture type: \"%s\" ", torture_type); pr_alert("rcu-torture types:"); |
cf886c44e rcu: Improve rcut... |
1956 |
for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e443 rcu: Switch rcuto... |
1957 1958 1959 |
pr_alert(" %s", torture_ops[i]->name); pr_alert(" "); |
343e9099c rcu: fix rcutortu... |
1960 |
mutex_unlock(&fullstop_mutex); |
a71fca58b rcu: Fix whitespa... |
1961 |
return -EINVAL; |
72e9bb549 [PATCH] rcutortur... |
1962 |
} |
bf66f18e7 rcu: Add force_qu... |
1963 |
if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e443 rcu: Switch rcuto... |
1964 1965 |
pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled. "); |
bf66f18e7 rcu: Add force_qu... |
1966 1967 |
fqs_duration = 0; } |
c8e5b1631 rcutorture: style... |
1968 |
if (cur_ops->init) |
72e9bb549 [PATCH] rcutortur... |
1969 |
cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
a241ec65a [PATCH] RCU tortu... |
1970 1971 1972 1973 |
if (nreaders >= 0) nrealreaders = nreaders; else nrealreaders = 2 * num_online_cpus(); |
8e8be45e8 rcu: add priority... |
1974 |
rcu_torture_print_module_parms(cur_ops, "Start of test"); |
c9d557c19 rcu: fix bug in r... |
1975 |
fullstop = FULLSTOP_DONTSTOP; |
a241ec65a [PATCH] RCU tortu... |
1976 1977 1978 1979 |
/* Set up the freelist. */ INIT_LIST_HEAD(&rcu_torture_freelist); |
788e770eb rcutorture: Use A... |
1980 |
for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2c [PATCH] add succe... |
1981 |
rcu_tortures[i].rtort_mbtest = 0; |
a241ec65a [PATCH] RCU tortu... |
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 |
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... |
1993 1994 |
atomic_set(&n_rcu_torture_mberror, 0); atomic_set(&n_rcu_torture_error, 0); |
fae4b54f2 rcu: Introduce rc... |
1995 |
n_rcu_torture_barrier_error = 0; |
8e8be45e8 rcu: add priority... |
1996 1997 |
n_rcu_torture_boost_ktrerror = 0; n_rcu_torture_boost_rterror = 0; |
8e8be45e8 rcu: add priority... |
1998 1999 |
n_rcu_torture_boost_failure = 0; n_rcu_torture_boosts = 0; |
a241ec65a [PATCH] RCU tortu... |
2000 2001 |
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) atomic_set(&rcu_torture_wcount[i], 0); |
0a9450227 [PATCH] for_each_... |
2002 |
for_each_possible_cpu(cpu) { |
a241ec65a [PATCH] RCU tortu... |
2003 2004 2005 2006 2007 2008 2009 2010 2011 |
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"); |
60f53782c rcu: Prevent init... |
2012 2013 |
writer_task = kthread_create(rcu_torture_writer, NULL, "rcu_torture_writer"); |
a241ec65a [PATCH] RCU tortu... |
2014 2015 2016 2017 2018 2019 |
if (IS_ERR(writer_task)) { firsterr = PTR_ERR(writer_task); VERBOSE_PRINTK_ERRSTRING("Failed to create writer"); writer_task = NULL; goto unwind; } |
60f53782c rcu: Prevent init... |
2020 |
wake_up_process(writer_task); |
b772e1dd4 [PATCH] RCU: add ... |
2021 |
fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58b rcu: Fix whitespa... |
2022 |
GFP_KERNEL); |
b772e1dd4 [PATCH] RCU: add ... |
2023 2024 2025 2026 2027 2028 2029 2030 |
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... |
2031 |
"rcu_torture_fakewriter"); |
b772e1dd4 [PATCH] RCU: add ... |
2032 2033 2034 2035 2036 2037 2038 |
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... |
2039 |
reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65a [PATCH] RCU tortu... |
2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 |
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... |
2068 2069 |
if (test_no_idle_hz) { rcu_idle_cpu = num_online_cpus() - 1; |
73d0a4b10 cpumask: convert ... |
2070 2071 2072 2073 2074 2075 |
if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { firsterr = -ENOMEM; VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask"); goto unwind; } |
d84f52034 [PATCH] Extend RC... |
2076 2077 2078 2079 |
/* Create the shuffler thread */ shuffler_task = kthread_run(rcu_torture_shuffle, NULL, "rcu_torture_shuffle"); if (IS_ERR(shuffler_task)) { |
73d0a4b10 cpumask: convert ... |
2080 |
free_cpumask_var(shuffle_tmp_mask); |
d84f52034 [PATCH] Extend RC... |
2081 2082 2083 2084 2085 2086 |
firsterr = PTR_ERR(shuffler_task); VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); shuffler_task = NULL; goto unwind; } } |
d120f65f3 rcu: make rcutort... |
2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 |
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... |
2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 |
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; } } |
8e8be45e8 rcu: add priority... |
2113 2114 2115 2116 2117 2118 |
if (test_boost_interval < 1) test_boost_interval = 1; if (test_boost_duration < 2) test_boost_duration = 2; if ((test_boost == 1 && cur_ops->can_boost) || test_boost == 2) { |
8e8be45e8 rcu: add priority... |
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 |
boost_starttime = jiffies + test_boost_interval * HZ; register_cpu_notifier(&rcutorture_cpu_nb); for_each_possible_cpu(i) { if (cpu_is_offline(i)) continue; /* Heuristic: CPU can go offline. */ retval = rcutorture_booster_init(i); if (retval < 0) { firsterr = retval; goto unwind; } } } |
d5f546d83 rcu: Add rcutortu... |
2132 2133 |
if (shutdown_secs > 0) { shutdown_time = jiffies + shutdown_secs * HZ; |
60f53782c rcu: Prevent init... |
2134 2135 |
shutdown_task = kthread_create(rcu_torture_shutdown, NULL, "rcu_torture_shutdown"); |
d5f546d83 rcu: Add rcutortu... |
2136 2137 2138 2139 2140 2141 |
if (IS_ERR(shutdown_task)) { firsterr = PTR_ERR(shutdown_task); VERBOSE_PRINTK_ERRSTRING("Failed to create shutdown"); shutdown_task = NULL; goto unwind; } |
60f53782c rcu: Prevent init... |
2142 |
wake_up_process(shutdown_task); |
d5f546d83 rcu: Add rcutortu... |
2143 |
} |
37e377d28 rcu: Fixes to rcu... |
2144 2145 2146 2147 2148 |
i = rcu_torture_onoff_init(); if (i != 0) { firsterr = i; goto unwind; } |
8e8be45e8 rcu: add priority... |
2149 |
register_reboot_notifier(&rcutorture_shutdown_nb); |
37e377d28 rcu: Fixes to rcu... |
2150 2151 2152 2153 2154 |
i = rcu_torture_stall_init(); if (i != 0) { firsterr = i; goto unwind; } |
fae4b54f2 rcu: Introduce rc... |
2155 2156 2157 2158 2159 |
retval = rcu_torture_barrier_init(); if (retval != 0) { firsterr = retval; goto unwind; } |
4a2986568 rcu: make rcutort... |
2160 |
rcutorture_record_test_transition(); |
343e9099c rcu: fix rcutortu... |
2161 |
mutex_unlock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
2162 2163 2164 |
return 0; unwind: |
343e9099c rcu: fix rcutortu... |
2165 |
mutex_unlock(&fullstop_mutex); |
a241ec65a [PATCH] RCU tortu... |
2166 2167 2168 2169 2170 2171 |
rcu_torture_cleanup(); return firsterr; } module_init(rcu_torture_init); module_exit(rcu_torture_cleanup); |