From 628edaa5062282b6e3d76c886fd2cbccae5cb87b Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 31 Jan 2014 11:57:43 -0800 Subject: rcutorture: Abstract stutter_wait() Because stuttering the test load (stopping and restarting it) is useful for non-RCU testing, this commit moves the load-stuttering functionality to kernel/torture.c. Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett --- kernel/rcu/rcutorture.c | 69 +++++++++---------------------------------------- 1 file changed, 12 insertions(+), 57 deletions(-) (limited to 'kernel/rcu') diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 9357c88cc8cc..4329ad14f8dc 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -103,7 +103,6 @@ static struct task_struct *writer_task; static struct task_struct **fakewriter_tasks; static struct task_struct **reader_tasks; static struct task_struct *stats_task; -static struct task_struct *stutter_task; static struct task_struct *fqs_task; static struct task_struct *boost_tasks[NR_CPUS]; static struct task_struct *shutdown_task; @@ -145,8 +144,6 @@ static long n_barrier_attempts; static long n_barrier_successes; static struct list_head rcu_torture_removed; -static int stutter_pause_test; - #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) #define RCUTORTURE_RUNNABLE_INIT 1 #else @@ -222,18 +219,6 @@ rcu_torture_free(struct rcu_torture *p) spin_unlock_bh(&rcu_torture_lock); } -static void -rcu_stutter_wait(const char *title) -{ - while (stutter_pause_test || !rcutorture_runnable) { - if (rcutorture_runnable) - schedule_timeout_interruptible(1); - else - schedule_timeout_interruptible(round_jiffies_relative(HZ)); - torture_shutdown_absorb(title); - } -} - /* * Operations vector for selecting different types of tests. */ @@ -571,7 +556,7 @@ static int rcu_torture_boost(void *arg) oldstarttime = boost_starttime; while (ULONG_CMP_LT(jiffies, oldstarttime)) { schedule_timeout_interruptible(oldstarttime - jiffies); - rcu_stutter_wait("rcu_torture_boost"); + stutter_wait("rcu_torture_boost"); if (torture_must_stop()) goto checkwait; } @@ -593,7 +578,7 @@ static int rcu_torture_boost(void *arg) call_rcu_time = jiffies; } cond_resched(); - rcu_stutter_wait("rcu_torture_boost"); + stutter_wait("rcu_torture_boost"); if (torture_must_stop()) goto checkwait; } @@ -618,7 +603,7 @@ static int rcu_torture_boost(void *arg) } /* Go do the stutter. */ -checkwait: rcu_stutter_wait("rcu_torture_boost"); +checkwait: stutter_wait("rcu_torture_boost"); } while (!torture_must_stop()); /* Clean up and exit. */ @@ -656,7 +641,7 @@ rcu_torture_fqs(void *arg) udelay(fqs_holdoff); fqs_burst_remaining -= fqs_holdoff; } - rcu_stutter_wait("rcu_torture_fqs"); + stutter_wait("rcu_torture_fqs"); } while (!torture_must_stop()); VERBOSE_TOROUT_STRING("rcu_torture_fqs task stopping"); torture_shutdown_absorb("rcu_torture_fqs"); @@ -728,7 +713,7 @@ rcu_torture_writer(void *arg) } } rcutorture_record_progress(++rcu_torture_current_version); - rcu_stutter_wait("rcu_torture_writer"); + stutter_wait("rcu_torture_writer"); } while (!torture_must_stop()); VERBOSE_TOROUT_STRING("rcu_torture_writer task stopping"); torture_shutdown_absorb("rcu_torture_writer"); @@ -765,7 +750,7 @@ rcu_torture_fakewriter(void *arg) } else { cur_ops->exp_sync(); } - rcu_stutter_wait("rcu_torture_fakewriter"); + stutter_wait("rcu_torture_fakewriter"); } while (!torture_must_stop()); VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task stopping"); @@ -910,7 +895,7 @@ rcu_torture_reader(void *arg) preempt_enable(); cur_ops->readunlock(idx); schedule(); - rcu_stutter_wait("rcu_torture_reader"); + stutter_wait("rcu_torture_reader"); } while (!torture_must_stop()); VERBOSE_TOROUT_STRING("rcu_torture_reader task stopping"); torture_shutdown_absorb("rcu_torture_reader"); @@ -1034,25 +1019,6 @@ rcu_torture_stats(void *arg) return 0; } -/* Cause the rcutorture test to "stutter", starting and stopping all - * threads periodically. - */ -static int -rcu_torture_stutter(void *arg) -{ - VERBOSE_TOROUT_STRING("rcu_torture_stutter task started"); - do { - schedule_timeout_interruptible(stutter * HZ); - stutter_pause_test = 1; - if (!kthread_should_stop()) - schedule_timeout_interruptible(stutter * HZ); - stutter_pause_test = 0; - torture_shutdown_absorb("rcu_torture_stutter"); - } while (!kthread_should_stop()); - VERBOSE_TOROUT_STRING("rcu_torture_stutter task stopping"); - return 0; -} - static inline void rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) { @@ -1403,11 +1369,7 @@ rcu_torture_cleanup(void) rcu_torture_barrier_cleanup(); rcu_torture_stall_cleanup(); - if (stutter_task) { - VERBOSE_TOROUT_STRING("Stopping rcu_torture_stutter task"); - kthread_stop(stutter_task); - } - stutter_task = NULL; + torture_stutter_cleanup(); if (writer_task) { VERBOSE_TOROUT_STRING("Stopping rcu_torture_writer task"); @@ -1548,7 +1510,7 @@ rcu_torture_init(void) &rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops, }; - torture_init_begin(torture_type, verbose); + torture_init_begin(torture_type, verbose, &rcutorture_runnable); /* Process args and tell the world that the torturer is on the job. */ for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { @@ -1682,21 +1644,14 @@ rcu_torture_init(void) 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_TOROUT_ERRSTRING("Failed to create stutter"); - stutter_task = NULL; + firsterr = torture_stutter_init(stutter * HZ); + if (firsterr) goto unwind; - } - torture_shuffle_task_register(stutter_task); } if (fqs_duration < 0) fqs_duration = 0; if (fqs_duration) { - /* Create the stutter thread */ + /* Create the fqs thread */ fqs_task = kthread_run(rcu_torture_fqs, NULL, "rcu_torture_fqs"); if (IS_ERR(fqs_task)) { -- cgit v1.2.3