tree f5e763afdab9a43ff632993d7be49e73d8a6df6c
parent 6adc74b7d03c06a8e15d51fe33c3d924ada9271a
author Oleg Nesterov <oleg@redhat.com> 1244722375 +0100
committer Linus Torvalds <torvalds@linux-foundation.org> 1244744798 -0700

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>