From e46a28790e594c0876d1a84270926abf75460f61 Mon Sep 17 00:00:00 2001 From: Minchan Kim Date: Mon, 8 Oct 2012 16:33:48 -0700 Subject: CMA: migrate mlocked pages Presently CMA cannot migrate mlocked pages so it ends up failing to allocate contiguous memory space. This patch makes mlocked pages be migrated out. Of course, it can affect realtime processes but in CMA usecase, contiguous memory allocation failing is far worse than access latency to an mlocked page being variable while CMA is running. If someone wants to make the system realtime, he shouldn't enable CMA because stalls can still happen at random times. [akpm@linux-foundation.org: tweak comment text, per Mel] Signed-off-by: Minchan Kim Acked-by: Mel Gorman Cc: Michal Nazarewicz Cc: Bartlomiej Zolnierkiewicz Cc: Marek Szyprowski Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm/page_alloc.c') diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 5485f0ef4ec3..fd86c47de86f 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5690,7 +5690,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc, if (list_empty(&cc->migratepages)) { cc->nr_migratepages = 0; pfn = isolate_migratepages_range(cc->zone, cc, - pfn, end); + pfn, end, true); if (!pfn) { ret = -EINTR; break; -- cgit v1.2.1