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authorJohannes Weiner <hannes@cmpxchg.org>2009-09-21 17:01:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:30 -0700
commit451ea25da71590361c71bf3044c55b870a887d53 (patch)
treee2e9de6e7c1fb4f79c0413a3c4d401ec9263b722 /README
parentbf88c8c83e4425d17e29daa5354ffb1f8ba7b225 (diff)
downloadop-kernel-dev-451ea25da71590361c71bf3044c55b870a887d53.zip
op-kernel-dev-451ea25da71590361c71bf3044c55b870a887d53.tar.gz
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>
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