linux-kernel - [PATCH 2/2] page allocator: Direct reclaim should always obey watermarks

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Message-Id: <1255689446-3858-3-git-send-email-mel@csn.ul.ie>
Date:	Fri, 16 Oct 2009 11:37:26 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	stable <stable@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	David Miller <davem@...emloft.net>,
	Frans Pop <elendil@...net.nl>,
	reinette chatre <reinette.chatre@...el.com>,
	Kalle Valo <kalle.valo@....fi>,
	"John W. Linville" <linville@...driver.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"linux-mm@...ck.org\"" <linux-mm@...ck.org>,
	Mel Gorman <mel@....ul.ie>
Subject: [PATCH 2/2] page allocator: Direct reclaim should always obey watermarks

ALLOC_NO_WATERMARKS should be cleared when trying to allocate from the
free-lists after a direct reclaim. If it's not, __GFP_NOFAIL allocations
from a process that is exiting can ignore watermarks. __GFP_NOFAIL is not
often used but the journal layer is one of those places. This is suspected of
causing an increase in the number of GFP_ATOMIC allocation failures reported.

Signed-off-by: Mel Gorman <mel@....ul.ie>
---
 mm/page_alloc.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index dfa4362..a3e5fed 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1860,7 +1860,8 @@ rebalance:
 	page = __alloc_pages_direct_reclaim(gfp_mask, order,
 					zonelist, high_zoneidx,
 					nodemask,
-					alloc_flags, preferred_zone,
+					alloc_flags & ~ALLOC_NO_WATERMARKS,
+					preferred_zone,
 					migratetype, &did_some_progress);
 	if (page)
 		goto got_pg;
-- 
1.6.3.3

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