| From: |
| riel@redhat.com |
| To: |
| linux-kernel@vger.kernel.org |
| Subject: |
| [PATCH 0/3] sched,numa: reduce page migrations with pseudo-interleaving |
| Date: |
| Fri, 11 Apr 2014 13:00:26 -0400 |
| Message-ID: |
| <1397235629-16328-1-git-send-email-riel@redhat.com> |
| Cc: |
| mingo@kernel.org, peterz@infradead.org, chegu_vinod@hp.com, mgorman@suse.de |
| Archive‑link: | |
Article |
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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