linux-kernel - [PATCH 3/7] vmscan: synchrounous lumpy reclaim use lock_page() instead trylock

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Message-Id: <20100805151304.31C0.A69D9226@jp.fujitsu.com>
Date:	Thu,  5 Aug 2010 15:13:39 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mel@....ul.ie>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH 3/7] vmscan: synchrounous lumpy reclaim use lock_page() instead trylock_page()

When synchrounous lumpy reclaim, there is no reason to give up to
reclaim pages even if page is locked. We use lock_page() instead
trylock_page() in this case.

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

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 1cdc3db..833b6ad 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));
-- 
1.6.5.2



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