linux-kernel - [PATCH 1/2] mmotm: mm-oom-rework-oom-detection-fix

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Date:	Thu, 12 May 2016 13:14:36 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Joonsoo Kim <js1304@...il.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Vlastimil Babka <vbabka@...e.cz>, <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.com>
Subject: [PATCH 1/2] mmotm: mm-oom-rework-oom-detection-fix

From: Michal Hocko <mhocko@...e.com>

watermark check should use classzone_idx rather than high_zoneidx
to check reserves against the correct (preferred) zone.

Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0d9008042efa..620ec002aea2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3496,7 +3496,7 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
 		 * available?
 		 */
 		if (__zone_watermark_ok(zone, order, min_wmark_pages(zone),
-				ac->high_zoneidx, alloc_flags, available)) {
+				ac_classzone_idx(ac), alloc_flags, available)) {
 			/*
 			 * If we didn't make any progress and have a lot of
 			 * dirty + writeback pages then we should wait for
-- 
2.8.1