linux-kernel - [PATCH 1/9] Revert "mm: compaction: check lock contention first before taking lock"

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Date:	Fri, 21 Sep 2012 11:46:15 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Richard Davies <richard@...chsys.com>,
	Shaohua Li <shli@...nel.org>, Rik van Riel <riel@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	QEMU-devel <qemu-devel@...gnu.org>, KVM <kvm@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 1/9] Revert "mm: compaction: check lock contention first before taking lock"

This reverts
mm-compaction-check-lock-contention-first-before-taking-lock.patch as it
is replaced by a later patch in the series.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/compaction.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 3bb7232..4a77b4b 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -347,9 +347,8 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
 
 	/* Time to isolate some pages for migration */
 	cond_resched();
-	locked = compact_trylock_irqsave(&zone->lru_lock, &flags, cc);
-	if (!locked)
-		return 0;
+	spin_lock_irqsave(&zone->lru_lock, flags);
+	locked = true;
 	for (; low_pfn < end_pfn; low_pfn++) {
 		struct page *page;
 
-- 
1.7.9.2

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