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Date:	Thu, 20 Dec 2012 21:50:21 +0800
From:	Alex Shi <>
To:	Linus Torvalds <>
Cc:	Mel Gorman <>,
	Peter Zijlstra <>,
	Andrea Arcangeli <>,
	Ingo Molnar <>, Rik van Riel <>,
	Johannes Weiner <>,
	Hugh Dickins <>,
	Thomas Gleixner <>,
	Paul Turner <>, Hillf Danton <>,
	David Rientjes <>,
	Lee Schermerhorn <>,
	Srikar Dronamraju <>,
	Aneesh Kumar <>,
	Andrew Morton <>,
	LKML <>
Subject: Re: [GIT PULL] Automatic NUMA Balancing V11

On Mon, Dec 17, 2012 at 7:19 AM, Linus Torvalds
<> wrote:
> On Wed, Dec 12, 2012 at 2:03 AM, Mel Gorman <> wrote:
>> This is a pull request for "Automatic NUMA Balancing V11". The list
> Ok, guys, I've pulled this and pushed out. There were some conflicts
> with both the VM changes and with the scheduler tree, but they were
> pretty small and looked simple, so I fixed them up and hope they all
> work.
> Has anybody tested the impact on single-node systems? If distros

I tested your tree till this patch set under our lkp testing system,
with benchmark kbuild, aim9-mutitask, specjbb2005 -openjdk/jrockit,
hackbench-process/thread, sysbench -fileio-cfq, multiple loop back
netperf, on 2 laptops, SNB i7, and WSM i5.
only aim9-mutitask-nl (2000 loads, increment 100) has about 2%
performance drop on both of machine.
all others has no clear performance change.

> enable this by default (and it does have 'default y', which is a big
> no-no for new features - I undid that part) then there will be tons of
> people running this without actually having multiple sockets. Does it
> gracefully avoid pointless overheads for this case?
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