linux-kernel - [PATCH 04/10] vmscan: Synchronous lumpy reclaim should not call congestion

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Date:	Mon,  6 Sep 2010 11:47:27 +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 04/10] vmscan: Synchronous lumpy reclaim should not call congestion_wait()

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

congestion_wait() mean "waiting queue congestion is cleared".  However,
synchronous lumpy reclaim does not need this congestion_wait() as
shrink_page_list(PAGEOUT_IO_SYNC) uses wait_on_page_writeback()
and it provides the necessary waiting.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: Mel Gorman <mel@....ul.ie>
---
 mm/vmscan.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index eabe987..5979850 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1341,8 +1341,6 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
 
 	/* Check if we should syncronously wait for writeback */
 	if (should_reclaim_stall(nr_taken, nr_reclaimed, priority, sc)) {
-		wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
-
 		/*
 		 * The attempt at page out may have made some
 		 * of the pages active, mark them inactive again.
-- 
1.7.1

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