linux-kernel - Re: [PATCH 1/3] sched,numa: count pages on active node as local

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Date:	Fri, 25 Apr 2014 10:04:12 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	riel@...hat.com
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	peterz@...radead.org, chegu_vinod@...com
Subject: Re: [PATCH 1/3] sched,numa: count pages on active node as local

On Fri, Apr 11, 2014 at 01:00:27PM -0400, riel@...hat.com wrote:
> From: Rik van Riel <riel@...hat.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@...hat.com>
> Tested-by: Vinod Chegu <chegu_vinod@...com>

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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