[patch] mm, compaction: ignore pageblock skip when manually invokingcompaction

From: David Rientjes
Date: Thu Jan 23 2014 - 00:56:40 EST

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>
mm/compaction.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/mm/compaction.c b/mm/compaction.c
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1177,6 +1177,7 @@ 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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