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mm: use migrate_prep() instead of migrate_prep_local()

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__alloc_contig_migrate_range() should use all possible ways to get all the
pages migrated from the given memory range, so pruning per-cpu lru lists
for all CPUs is required, regadless the cost of such operation.  Otherwise
some pages which got stuck at per-cpu lru list might get missed by
migration procedure causing the contiguous allocation to fail.

Reported-by: SeongHwan Yoon <sunghwan.yun@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Marek Szyprowski 2012-12-12 13:51:19 -08:00 committed by Linus Torvalds
parent c8bf2d8ba4
commit be49a6e135
1 changed files with 1 additions and 1 deletions
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2
mm/page_alloc.c
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@ -5727,7 +5727,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
unsigned int tries = 0;
int ret = 0;
migrate_prep_local();
migrate_prep();
while (pfn < end || !list_empty(&cc->migratepages)) {
if (fatal_signal_pending(current)) {