From: Mel Gorman <mgorman@suse.de>
To: riel@redhat.com
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
peterz@infradead.org, mingo@redhat.com, chegu_vinod@hp.com
Subject: Re: [PATCH 5/9] numa,sched,mm: use active_nodes nodemask to limit numa migrations
Date: Tue, 28 Jan 2014 09:58:28 +0000 [thread overview]
Message-ID: <20140128095828.GR4963@suse.de> (raw)
In-Reply-To: <1390860228-21539-6-git-send-email-riel@redhat.com>
On Mon, Jan 27, 2014 at 05:03:44PM -0500, riel@redhat.com wrote:
> From: Rik van Riel <riel@redhat.com>
>
> Use the active_nodes nodemask to make smarter decisions on NUMA migrations.
>
> In order to maximize performance of workloads that do not fit in one NUMA
> node, we want to satisfy the following criteria:
> 1) keep private memory local to each thread
> 2) avoid excessive NUMA migration of pages
> 3) distribute shared memory across the active nodes, to
> maximize memory bandwidth available to the workload
>
> This patch accomplishes that by implementing the following policy for
> NUMA migrations:
> 1) always migrate on a private fault
> 2) never migrate to a node that is not in the set of active nodes
> for the numa_group
> 3) always migrate from a node outside of the set of active nodes,
> to a node that is in that set
> 4) within the set of active nodes in the numa_group, only migrate
> from a node with more NUMA page faults, to a node with fewer
> NUMA page faults, with a 25% margin to avoid ping-ponging
>
> This results in most pages of a workload ending up on the actively
> used nodes, with reduced ping-ponging of pages between those nodes.
>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Chegu Vinod <chegu_vinod@hp.com>
> Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2014-01-28 9:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-27 22:03 [PATCH v5 0/9] numa,sched,mm: pseudo-interleaving for automatic NUMA balancing riel
2014-01-27 22:03 ` [PATCH 1/9] numa,sched,mm: remove p->numa_migrate_deferred riel
2014-01-27 22:03 ` [PATCH 2/9] rename p->numa_faults to numa_faults_memory riel
2014-01-27 22:03 ` [PATCH 3/9] numa,sched: track from which nodes NUMA faults are triggered riel
2014-01-27 22:03 ` [PATCH 4/9] numa,sched: build per numa_group active node mask from numa_faults_cpu statistics riel
2014-01-27 22:03 ` [PATCH 5/9] numa,sched,mm: use active_nodes nodemask to limit numa migrations riel
2014-01-28 9:58 ` Mel Gorman [this message]
2014-01-27 22:03 ` [PATCH 6/9] numa,sched: normalize faults_cpu stats and weigh by CPU use riel
2014-01-28 10:01 ` Mel Gorman
2014-01-27 22:03 ` [PATCH 7/9] numa,sched: do statistics calculation using local variables only riel
2014-01-27 22:03 ` [PATCH 8/9] numa,sched: rename variables in task_numa_fault riel
2014-01-27 22:03 ` [PATCH 9/9] numa,sched: turn some magic numbers into defines riel
2014-01-28 0:35 ` [PATCH v5 0/9] numa,sched,mm: pseudo-interleaving for automatic NUMA balancing Chegu Vinod
-- strict thread matches above, loose matches on Subject: below --
2014-01-21 22:20 [PATCH v4 0/9] " riel
2014-01-21 22:20 ` [PATCH 5/9] numa,sched,mm: use active_nodes nodemask to limit numa migrations riel
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