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Message-ID: <20140425090412.GA23991@suse.de> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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