Commit b415c49a authored Jun 11, 2009 by Oleg Nesterov Committed by Linus Torvalds Jun 11, 2009

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: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus 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 &&

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