linux-kernel - [PATCH 3/7] mm/balloon_compaction: isolate balloon pages without lru

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Message-id: <20140820150446.4194.5716.stgit@buzz>
Date:	Wed, 20 Aug 2014 19:04:46 +0400
From:	Konstantin Khlebnikov <k.khlebnikov@...sung.com>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Rafael Aquini <aquini@...hat.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/7] mm/balloon_compaction: isolate balloon pages without
 lru_lock

LRU-lock isn't required for balloon page isolation. This check makes migration
of some ballooned pages mostly impossible because isolate_migratepages_range()
drops LRU lock periodically.

Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@...sung.com>
Cc: stable <stable@...r.kernel.org> # v3.8
---
 mm/compaction.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 21bf292..0653f5f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -597,7 +597,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
 		 */
 		if (!PageLRU(page)) {
 			if (unlikely(balloon_page_movable(page))) {
-				if (locked && balloon_page_isolate(page)) {
+				if (balloon_page_isolate(page)) {
 					/* Successfully isolated */
 					goto isolate_success;
 				}

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