From: Mel Gorman <mgorman@suse.de>
To: riel@redhat.com
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
peterz@infradead.org, chegu_vinod@hp.com
Subject: Re: [PATCH 1/3] sched,numa: count pages on active node as local
Date: Fri, 25 Apr 2014 10:04:12 +0100 [thread overview]
Message-ID: <20140425090412.GA23991@suse.de> (raw)
In-Reply-To: <1397235629-16328-2-git-send-email-riel@redhat.com>
On Fri, Apr 11, 2014 at 01:00:27PM -0400, riel@redhat.com wrote:
> From: Rik van Riel <riel@redhat.com>
>
> The NUMA code is smart enough to distribute the memory of workloads
> that span multiple NUMA nodes across those NUMA nodes.
>
> However, it still has a pretty high scan rate for such workloads,
> because any memory that is left on a node other than the node of
> the CPU that faulted on the memory is counted as non-local, which
> causes the scan rate to go up.
>
> Counting the memory on any node where the task's numa group is
> actively running as local, allows the scan rate to slow down
> once the application is settled in.
>
> This should reduce the overhead of the automatic NUMA placement
> code, when a workload spans multiple NUMA nodes.
>
> Signed-off-by: Rik van Riel <riel@redhat.com>
> Tested-by: Vinod Chegu <chegu_vinod@hp.com>
Acked-by: Mel Gorman <mgorman@suse.de>
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2014-04-25 9:04 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-11 17:00 [PATCH 0/3] sched,numa: reduce page migrations with pseudo-interleaving riel
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 [this message]
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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