[PATCH 34/97] mm, compaction: ignore pageblock skip when manually invoking compaction

From: Mel Gorman
Date: Thu Aug 28 2014 - 15:03:19 EST

From: David Rientjes <rientjes@xxxxxxxxxx>

commit 91ca9186484809c57303b33778d841cc28f696ed upstream.

The cached pageblock hint should be ignored when triggering compaction
through /proc/sys/vm/compact_memory so all eligible memory is isolated.
Manually invoking compaction is known to be expensive, there's no need
to skip pageblocks based on heuristics (mainly for debugging).

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
mm/compaction.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/mm/compaction.c b/mm/compaction.c
index 4530818..5c17302 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1191,6 +1191,7 @@ static void compact_node(int nid)
struct compact_control cc = {
.order = -1,
.sync = true,
+ .ignore_skip_hint = true,

__compact_pgdat(NODE_DATA(nid), &cc);

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