linux-kernel - [PATCH v2 3/6] mm/balloon_compaction: isolate balloon pages without lru

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Date:	Sat, 30 Aug 2014 20:41:17 +0400
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Konstantin Khlebnikov <k.khlebnikov@...sung.com>,
	Rafael Aquini <aquini@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH v2 3/6] mm/balloon_compaction: isolate balloon pages without
 lru_lock

From: Konstantin Khlebnikov <k.khlebnikov@...sung.com>

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 73466e1..ad58f73 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -643,7 +643,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		 */
 		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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