From: David Rientjes <rientjes@google.com>
Date: Thu, 3 Apr 2014 21:47:23 +0000 (-0700)
Subject: mm, compaction: ignore pageblock skip when manually invoking compaction
X-Git-Tag: v3.14.21~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=67c58ce60024b9b3d9cf203da994bf265aa7e369;p=thirdparty%2Fkernel%2Fstable.git

mm, compaction: ignore pageblock skip when manually invoking compaction

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@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/mm/compaction.c b/mm/compaction.c
index 951209b919519..5e38e5706f622 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1193,6 +1193,7 @@ static void compact_node(int nid)
 	struct compact_control cc = {
 		.order = -1,
 		.sync = true,
+		.ignore_skip_hint = true,
 	};
 
 	__compact_pgdat(NODE_DATA(nid), &cc);