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Date:	Mon,  7 Apr 2014 23:34:26 +0100
From:	Mel Gorman <>
To:	Andrew Morton <>
Cc:	Robert Haas <>,
	Josh Berkus <>,
	Andres Freund <>,
	Christoph Lameter <>,
	Linux-MM <>,
	LKML <>, Mel Gorman <>
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(-)


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