linux-kernel - [PATCH 02/27] mm, vmscan: Check if cpusets are enabled during direct reclaim

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Message-Id: <1456239890-20737-3-git-send-email-mgorman@techsingularity.net>
Date:	Tue, 23 Feb 2016 15:04:25 +0000
From:	Mel Gorman <mgorman@...hsingularity.net>
To:	Linux-MM <linux-mm@...ck.org>
Cc:	Rik van Riel <riel@...riel.com>, Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 02/27] mm, vmscan: Check if cpusets are enabled during direct reclaim

Direct reclaim obeys cpusets but misses the cpusets_enabled() check.
The overhead is unlikely to be measurable in the direct reclaim
path which is expensive but there is no harm is doing it.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 86eb21491867..de8d6226e026 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2566,7 +2566,7 @@ static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 		 * to global LRU.
 		 */
 		if (global_reclaim(sc)) {
-			if (!cpuset_zone_allowed(zone,
+			if (cpusets_enabled() && !cpuset_zone_allowed(zone,
 						 GFP_KERNEL | __GFP_HARDWALL))
 				continue;
 
-- 
2.6.4