From: riel@redhat.com
To: linux-kernel@vger.kernel.org
Cc: mingo@kernel.org, peterz@infradead.org, chegu_vinod@hp.com,
mgorman@suse.de
Subject: [PATCH 0/3] sched,numa: reduce page migrations with pseudo-interleaving
Date: Fri, 11 Apr 2014 13:00:26 -0400 [thread overview]
Message-ID: <1397235629-16328-1-git-send-email-riel@redhat.com> (raw)
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
next reply other threads:[~2014-04-11 17:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-11 17:00 riel [this message]
2014-04-11 17:00 ` [PATCH 1/3] sched,numa: count pages on active node as local riel
2014-04-11 17:34 ` Joe Perches
2014-04-11 17:41 ` Rik van Riel
2014-04-11 18:01 ` Joe Perches
2014-04-25 9:04 ` Mel Gorman
2014-05-08 10:42 ` [tip:sched/core] sched/numa: Count " tip-bot for Rik van Riel
2014-04-11 17:00 ` [PATCH 2/3] sched,numa: retry placement more frequently when misplaced riel
2014-04-11 17:46 ` Joe Perches
2014-04-11 18:03 ` Rik van Riel
2014-04-14 8:19 ` Ingo Molnar
2014-04-25 9:05 ` Mel Gorman
2014-05-08 10:42 ` [tip:sched/core] sched/numa: Retry " tip-bot for Rik van Riel
2014-04-11 17:00 ` [PATCH 3/3] sched,numa: do not set preferred_node on migration to a second choice node riel
2014-04-14 12:56 ` Peter Zijlstra
2014-04-15 14:35 ` Rik van Riel
2014-04-15 16:51 ` Peter Zijlstra
2014-04-25 9:09 ` Mel Gorman
2014-05-08 10:43 ` [tip:sched/core] sched/numa: Do " tip-bot for Rik van Riel
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