linux-kernel - [PATCH] vmscan: Do reclaim stall in case of mlocked page.

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Date:	Tue, 15 Nov 2011 00:37:23 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>
Subject: [PATCH] vmscan: Do reclaim stall in case of mlocked page.

[1] made avoid unnecessary reclaim stall when second shrink_page_list(ie, synchronous
shrink_page_list) try to reclaim page_list which has not-dirty pages.
But it seems rather awkawrd on unevictable page.
The unevictable page in shrink_page_list would be moved into unevictable lru from page_list.
So it would be not on page_list when shrink_page_list returns.
Nevertheless it skips reclaim stall.

This patch fixes it so that it can do reclaim stall in case of mixing mlocked pages
and writeback pages on page_list.

[1] 7d3579e,vmscan: narrow the scenarios in whcih lumpy reclaim uses synchrounous reclaim

CC: Mel Gorman <mgorman@...e.de>
CC: Johannes Weiner <jweiner@...hat.com>
CC: Rik van Riel <riel@...hat.com>
CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 mm/vmscan.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2300342..23878de 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -987,7 +987,6 @@ cull_mlocked:
 			try_to_free_swap(page);
 		unlock_page(page);
 		putback_lru_page(page);
-		reset_reclaim_mode(sc);
 		continue;
 
 activate_locked:
-- 
1.7.6

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