linux-kernel - [PATCH 0/2] Disable zone_reclaim

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Date:	Mon,  7 Apr 2014 23:34:26 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Robert Haas <robertmhaas@...il.com>,
	Josh Berkus <josh@...iodbs.com>,
	Andres Freund <andres@...quadrant.com>,
	Christoph Lameter <cl@...ux.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 0/2] Disable zone_reclaim_mode by default

When it was introduced, zone_reclaim_mode made sense as NUMA distances
punished and workloads were generally partitioned to fit into a NUMA
node. NUMA machines are now common but few of the workloads are NUMA-aware
and it's routine to see major performance due to zone_reclaim_mode being
disabled but relatively few can identify the problem.

Those that require zone_reclaim_mode are likely to be able to detect when
it needs to be enabled and tune appropriately so lets have a sensible
default for the bulk of users.

 Documentation/sysctl/vm.txt | 17 +++++++++--------
 include/linux/mmzone.h      |  1 -
 mm/page_alloc.c             | 17 +----------------
 3 files changed, 10 insertions(+), 25 deletions(-)

-- 
1.8.4.5

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