linux-kernel - [PATCH v2 2/2] vmscan: shrink_slab() require number of lru

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Message-Id: <20100708163934.CD37.A69D9226@jp.fujitsu.com>
Date:	Thu,  8 Jul 2010 16:40:47 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH v2 2/2] vmscan: shrink_slab() require number of lru_pages, not page order

Fix simple argument error. Usually 'order' is very small value than
lru_pages. then it can makes unnecessary icache dropping.

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 8715da1..60d813b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2617,6 +2617,8 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 
 	n = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
 	if (n > zone->min_slab_pages) {
+		unsigned long lru_pages = zone_reclaimable_pages(zone);
+
 		/*
 		 * shrink_slab() does not currently allow us to determine how
 		 * many pages were freed in this zone. So we take the current
@@ -2627,7 +2629,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 		 * Note that shrink_slab will free memory on all zones and may
 		 * take a long time.
 		 */
-		while (shrink_slab(sc.nr_scanned, gfp_mask, order) &&
+		while (shrink_slab(sc.nr_scanned, gfp_mask, lru_pages) &&
 		       (zone_page_state(zone, NR_SLAB_RECLAIMABLE) + nr_pages > n))
 			;
 
-- 
1.6.5.2



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