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thp: don't alloc harder for gfp nomemalloc even if nowait 

Not worth throwing away the precious reserved free memory pool for
allocations that can fail gracefully (either through mempool or because
they're transhuge allocations later falling back to 4k allocations).

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2011-01-13 15:46:49 -08:00 committed by Linus Torvalds
parent 32dba98e08
commit 5c3240d92e
1 changed files with 6 additions and 1 deletions
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7
mm/page_alloc.c
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@ -1971,7 +1971,12 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
alloc_flags |= (__force int) (gfp_mask & __GFP_HIGH);
if (!wait) {
alloc_flags |= ALLOC_HARDER;
/*
* Not worth trying to allocate harder for
* __GFP_NOMEMALLOC even if it can't schedule.
*/
if (!(gfp_mask & __GFP_NOMEMALLOC))
alloc_flags |= ALLOC_HARDER;
/*
* Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc.
* See also cpuset_zone_allowed() comment in kernel/cpuset.c.