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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-01-31 23:52:13 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-02-23 18:03:18 +0100
commite991dbc0770b01b7dc7d6d7660442e83ebd11828 (patch)
treee95081adbe3c4e85daeae774a9736af2fcfc1f46 /kernel/rcu
parentrcutorture: Apply ACCESS_ONCE() to racy fullstop accesses (diff)
downloadlinux-e991dbc0770b01b7dc7d6d7660442e83ebd11828.tar.xz
linux-e991dbc0770b01b7dc7d6d7660442e83ebd11828.zip
rcutorture: Abstract torture_shutdown()
Because auto-shutdown of torture testing is not specific to RCU, this commit moves the auto-shutdown function to kernel/torture.c. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/rcutorture.c63
1 files changed, 5 insertions, 58 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 4329ad14f8dc..897b0f91f899 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -105,7 +105,6 @@ static struct task_struct **reader_tasks;
static struct task_struct *stats_task;
static struct task_struct *fqs_task;
static struct task_struct *boost_tasks[NR_CPUS];
-static struct task_struct *shutdown_task;
static struct task_struct *stall_task;
static struct task_struct **barrier_cbs_tasks;
static struct task_struct *barrier_task;
@@ -173,7 +172,6 @@ static u64 notrace rcu_trace_clock_local(void)
}
#endif /* #else #ifdef CONFIG_RCU_TRACE */
-static unsigned long shutdown_time; /* jiffies to system shutdown. */
static unsigned long boost_starttime; /* jiffies of next boost test start. */
DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */
/* and boost task create/destroy. */
@@ -183,9 +181,6 @@ 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);
-/* Forward reference. */
-static void rcu_torture_cleanup(void);
-
/*
* Allocate an element from the rcu_tortures pool.
*/
@@ -1087,42 +1082,6 @@ static int rcutorture_booster_init(int cpu)
}
/*
- * 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_TOROUT_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)
- pr_alert("%s" TORTURE_FLAG
- "rcu_torture_shutdown task: %lu jiffies remaining\n",
- torture_type, delta);
- schedule_timeout_interruptible(delta);
- jiffies_snap = ACCESS_ONCE(jiffies);
- }
- if (kthread_should_stop()) {
- VERBOSE_TOROUT_STRING("rcu_torture_shutdown task stopping");
- return 0;
- }
-
- /* OK, shut down the system. */
-
- VERBOSE_TOROUT_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;
-}
-
-/*
* CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then
* induces a CPU stall for the time specified by stall_cpu.
*/
@@ -1421,11 +1380,7 @@ rcu_torture_cleanup(void)
for_each_possible_cpu(i)
rcutorture_booster_cleanup(i);
}
- if (shutdown_task != NULL) {
- VERBOSE_TOROUT_STRING("Stopping rcu_torture_shutdown task");
- kthread_stop(shutdown_task);
- }
- shutdown_task = NULL;
+ torture_shutdown_cleanup();
/* Wait for all RCU callbacks to fire. */
@@ -1681,18 +1636,10 @@ rcu_torture_init(void)
}
}
}
- if (shutdown_secs > 0) {
- shutdown_time = jiffies + shutdown_secs * HZ;
- shutdown_task = kthread_create(rcu_torture_shutdown, NULL,
- "rcu_torture_shutdown");
- if (IS_ERR(shutdown_task)) {
- firsterr = PTR_ERR(shutdown_task);
- VERBOSE_TOROUT_ERRSTRING("Failed to create shutdown");
- shutdown_task = NULL;
- goto unwind;
- }
- torture_shuffle_task_register(shutdown_task);
- wake_up_process(shutdown_task);
+ i = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup);
+ if (i != 0) {
+ firsterr = i;
+ goto unwind;
}
i = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ);
if (i != 0) {