tree e2e9de6e7c1fb4f79c0413a3c4d401ec9263b722
parent bf88c8c83e4425d17e29daa5354ffb1f8ba7b225
author Johannes Weiner <hannes@cmpxchg.org> 1253577708 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1253629050 -0700

mm: perform non-atomic test-clear of PG_mlocked on free

By the time PG_mlocked is cleared in the page freeing path, nobody else is
looking at our page->flags anymore.

It is thus safe to make the test-and-clear non-atomic and thereby removing
an unnecessary and expensive operation from a hotpath.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>