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

[Vlastimil Babka]

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@xxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Cc: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
---
 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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