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Commit b415c49a authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
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slow_work_thread() should do the exclusive wait 



slow_work_thread() sleeps on slow_work_thread_wq without WQ_FLAG_EXCLUSIVE,
this means that slow_work_enqueue()->__wake_up(nr_exclusive => 1) wakes up all
kslowd threads.  This is not what we want, so we change slow_work_thread() to
use prepare_to_wait_exclusive() instead.

Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6adc74b7

kernel/slow-work.c

+2 −2
Original line number Diff line number Diff line
@@ -372,7 +372,7 @@ static int slow_work_thread(void *_data) 
		vsmax *= atomic_read(&slow_work_thread_count);

		vsmax /= 100;



		prepare_to_wait(&slow_work_thread_wq, &wait,

		prepare_to_wait_exclusive(&slow_work_thread_wq, &wait,

					  TASK_INTERRUPTIBLE);

		if (!freezing(current) &&

		    !slow_work_threads_should_exit &&