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rcutorture: Hoist OOM registry up one level

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Currently, registering and unregistering the OOM notifier is done
right before and after the test, respectively.  This will not work
well for multi-threaded tests, so this commit hoists this registering
and unregistering up into the rcu_torture_fwd_prog_init() and
rcu_torture_fwd_prog_cleanup() functions.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-07-22 10:45:12 -07:00
parent 58db5785b0
commit 299c7d94f6
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/rcutorture.c
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@ -2110,13 +2110,11 @@ static int rcu_torture_fwd_prog(void *args)
do {
schedule_timeout_interruptible(fwd_progress_holdoff * HZ);
WRITE_ONCE(rcu_fwd_emergency_stop, false);
register_oom_notifier(&rcutorture_oom_nb);
if (!IS_ENABLED(CONFIG_TINY_RCU) ||
rcu_inkernel_boot_has_ended())
rcu_torture_fwd_prog_nr(rfp, &tested, &tested_tries);
if (rcu_inkernel_boot_has_ended())
rcu_torture_fwd_prog_cr(rfp);
unregister_oom_notifier(&rcutorture_oom_nb);
/* Avoid slow periods, better to test when busy. */
stutter_wait("rcu_torture_fwd_prog");
@ -2159,6 +2157,7 @@ static int __init rcu_torture_fwd_prog_init(void)
mutex_lock(&rcu_fwd_mutex);
rcu_fwds = rfp;
mutex_unlock(&rcu_fwd_mutex);
register_oom_notifier(&rcutorture_oom_nb);
return torture_create_kthread(rcu_torture_fwd_prog, rfp, fwd_prog_task);
}
@ -2171,6 +2170,7 @@ static void rcu_torture_fwd_prog_cleanup(void)
mutex_lock(&rcu_fwd_mutex);
rcu_fwds = NULL;
mutex_unlock(&rcu_fwd_mutex);
unregister_oom_notifier(&rcutorture_oom_nb);
kfree(rfp);
}