linux-kernel - [PATCH 05/10] vmscan: Synchrounous lumpy reclaim use lock_page() instead trylock

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Date:	Mon,  6 Sep 2010 11:47:28 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Cc:	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Christoph Hellwig <hch@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>
Subject: [PATCH 05/10] vmscan: Synchrounous lumpy reclaim use lock_page() instead trylock_page()

From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

With synchrounous lumpy reclaim, there is no reason to give up to reclaim
pages even if page is locked. This patch uses lock_page() instead of
trylock_page() in this case.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: Mel Gorman <mel@....ul.ie>
---
 mm/vmscan.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5979850..79bd812 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -665,7 +665,9 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 		page = lru_to_page(page_list);
 		list_del(&page->lru);
 
-		if (!trylock_page(page))
+		if (sync_writeback == PAGEOUT_IO_SYNC)
+			lock_page(page);
+		else if (!trylock_page(page))
 			goto keep;
 
 		VM_BUG_ON(PageActive(page));
-- 
1.7.1

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