linux-kernel - [PATCH 2/4] mm, page_isolation: drain single zone pcplists

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Date:	Thu,  2 Oct 2014 17:48:58 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Vlastimil Babka <vbabka@...e.cz>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Xishi Qiu <qiuxishi@...wei.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 2/4] mm, page_isolation: drain single zone pcplists

When setting MIGRATETYPE_ISOLATE on a pageblock, pcplists are drained to have
a better chance that all pages will be successfully isolated and not left
in the per-cpu caches. Since isolation is always concerned with a single zone,
we can reduce the pcplists drain to the single zone, which is now possible.

The change should make memory isolation faster and not disturbing unrelated
pcplists anymore.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Rik van Riel <riel@...hat.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc: Xishi Qiu <qiuxishi@...wei.com>
Cc: Vladimir Davydov <vdavydov@...allels.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/page_isolation.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index a57f082..3c49ef0 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -67,7 +67,7 @@ out:
 
 	spin_unlock_irqrestore(&zone->lock, flags);
 	if (!ret)
-		drain_all_pages(NULL);
+		drain_all_pages(zone);
 	return ret;
 }
 
-- 
1.8.4.5

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