From 451ea25da71590361c71bf3044c55b870a887d53 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Mon, 21 Sep 2009 17:01:48 -0700 Subject: 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 Reviewed-by: Christoph Lameter Reviewed-by: KOSAKI Motohiro Cc: Christoph Lameter Cc: Mel Gorman Cc: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'mm/page_alloc.c') diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 81926c7..9242d13 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -557,7 +557,7 @@ static void __free_pages_ok(struct page *page, unsigned int order) unsigned long flags; int i; int bad = 0; - int wasMlocked = TestClearPageMlocked(page); + int wasMlocked = __TestClearPageMlocked(page); kmemcheck_free_shadow(page, order); @@ -1026,7 +1026,7 @@ static void free_hot_cold_page(struct page *page, int cold) struct zone *zone = page_zone(page); struct per_cpu_pages *pcp; unsigned long flags; - int wasMlocked = TestClearPageMlocked(page); + int wasMlocked = __TestClearPageMlocked(page); kmemcheck_free_shadow(page, 0); -- cgit v1.1