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

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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>
This commit is contained in:
Johannes Weiner
2009-09-21 17:01:48 -07:00
committed by Linus Torvalds
parent bf88c8c83e
commit 451ea25da7
2 changed files with 11 additions and 5 deletions
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4
mm/page_alloc.c
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@ -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);