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authorMinchan Kim <minchan@kernel.org>2012-10-08 16:33:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:23:00 +0900
commite46a28790e594c0876d1a84270926abf75460f61 (patch)
treefebfaa6c20dab69490308190729f1d898e4df930 /include/linux/mmzone.h
parent7a71932d5676b7410ab64d149bad8bde6b0d8632 (diff)
downloadop-kernel-dev-e46a28790e594c0876d1a84270926abf75460f61.zip
op-kernel-dev-e46a28790e594c0876d1a84270926abf75460f61.tar.gz
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 <minchan@kernel.org> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index a557887..50aaca8 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -218,6 +218,8 @@ struct lruvec {
#define ISOLATE_UNMAPPED ((__force isolate_mode_t)0x2)
/* Isolate for asynchronous migration */
#define ISOLATE_ASYNC_MIGRATE ((__force isolate_mode_t)0x4)
+/* Isolate unevictable pages */
+#define ISOLATE_UNEVICTABLE ((__force isolate_mode_t)0x8)
/* LRU Isolation modes. */
typedef unsigned __bitwise__ isolate_mode_t;
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