Commit be49a6e1 authored Dec 12, 2012 by Marek Szyprowski Committed by Linus Torvalds Dec 12, 2012

mm: use migrate_prep() instead of migrate_prep_local()



__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>

parent c8bf2d8b

mm/page_alloc.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)) {

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