linux-kernel - [PATCH 0/3] sched,numa: reduce page migrations with pseudo-interleaving

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Date:	Fri, 11 Apr 2014 13:00:26 -0400
From:	riel@...hat.com
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, peterz@...radead.org, chegu_vinod@...com,
	mgorman@...e.de
Subject: [PATCH 0/3] sched,numa: reduce page migrations with pseudo-interleaving

The pseudo-interleaving code deals fairly well with the placement
of tasks that are part of workloads that span multiple NUMA nodes,
but the code has a number of corner cases left that can result in
higher than desired overhead.

This patch series reduces the overhead slightly, mostly visible
through a lower number of page migrations, while leaving the
throughput of the workload essentially unchanged.

On smaller NUMA systems, these patches should have little or no
effect. On a 4 node test system, I did see a reduction in the
number of page migrations running SPECjbb2005; autonuma-benchmark
appears to be unaffected.

NUMA page migrations on an 8 node system running SPECjbb2005,
courtesy of Vinod:

			vanilla		with patch
8 - 1 socket wide:	9138324		8918971
4 - 2 socket wide:	8239914		7315148
2 - 4 socket wide:	5732744		3849624
1 - 8 socket wide:	3348475		2660347 

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