From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@kernel.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 17/18] sched: Retry migration of tasks to CPU on a preferred node
Date: Thu, 1 Aug 2013 10:43:27 +0530 [thread overview]
Message-ID: <20130801051327.GF4880@linux.vnet.ibm.com> (raw)
In-Reply-To: <1373901620-2021-18-git-send-email-mgorman@suse.de>
* Mel Gorman <mgorman@suse.de> [2013-07-15 16:20:19]:
> When a preferred node is selected for a tasks there is an attempt to migrate
> the task to a CPU there. This may fail in which case the task will only
> migrate if the active load balancer takes action. This may never happen if
Apart from load imbalance or heavily loaded cpus on the preferred node,
what could be the other reasons for migration failure with
migrate_task_to()? I see it almost similar to active load balance except
for pushing instead of pulling tasks.
If load imbalance is the only reason, do we need to retry? If the task
is really so attached to memory on that node, shouldn't we getting
task_numa_placement hit before the next 5 seconds?
> the conditions are not right. This patch will check at NUMA hinting fault
> time if another attempt should be made to migrate the task. It will only
> make an attempt once every five seconds.
>
> Signed-off-by: Mel Gorman <mgorman@suse.de>
--
Thanks and Regards
Srikar Dronamraju
next prev parent reply other threads:[~2013-08-01 5:15 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-15 15:20 [PATCH 0/18] Basic scheduler support for automatic NUMA balancing V5 Mel Gorman
2013-07-15 15:20 ` [PATCH 01/18] mm: numa: Document automatic NUMA balancing sysctls Mel Gorman
2013-07-15 15:20 ` [PATCH 02/18] sched: Track NUMA hinting faults on per-node basis Mel Gorman
2013-07-17 10:50 ` Peter Zijlstra
2013-07-31 7:54 ` Mel Gorman
2013-07-29 10:10 ` Peter Zijlstra
2013-07-31 7:54 ` Mel Gorman
2013-07-15 15:20 ` [PATCH 03/18] mm: numa: Account for THP numa hinting faults on the correct node Mel Gorman
2013-07-17 0:33 ` Hillf Danton
2013-07-15 15:20 ` [PATCH 04/18] mm: numa: Do not migrate or account for hinting faults on the zero page Mel Gorman
2013-07-17 11:00 ` Peter Zijlstra
2013-07-31 8:11 ` Mel Gorman
2013-07-15 15:20 ` [PATCH 05/18] sched: Select a preferred node with the most numa hinting faults Mel Gorman
2013-07-15 15:20 ` [PATCH 06/18] sched: Update NUMA hinting faults once per scan Mel Gorman
2013-07-15 15:20 ` [PATCH 07/18] sched: Favour moving tasks towards the preferred node Mel Gorman
2013-07-25 10:40 ` [PATCH] sched, numa: migrates_degrades_locality() Peter Zijlstra
2013-07-31 8:44 ` Mel Gorman
2013-07-31 8:50 ` Peter Zijlstra
2013-07-15 15:20 ` [PATCH 08/18] sched: Reschedule task on preferred NUMA node once selected Mel Gorman
2013-07-17 1:31 ` Hillf Danton
2013-07-31 9:07 ` Mel Gorman
2013-07-31 9:38 ` Srikar Dronamraju
2013-08-01 4:47 ` Srikar Dronamraju
2013-08-01 15:38 ` Mel Gorman
2013-07-15 15:20 ` [PATCH 09/18] sched: Add infrastructure for split shared/private accounting of NUMA hinting faults Mel Gorman
2013-07-17 2:17 ` Hillf Danton
2013-07-31 9:08 ` Mel Gorman
2013-07-15 15:20 ` [PATCH 10/18] sched: Increase NUMA PTE scanning when a new preferred node is selected Mel Gorman
2013-07-15 15:20 ` [PATCH 11/18] sched: Check current->mm before allocating NUMA faults Mel Gorman
2013-07-15 15:20 ` [PATCH 12/18] sched: Set the scan rate proportional to the size of the task being scanned Mel Gorman
2013-07-15 15:20 ` [PATCH 13/18] mm: numa: Scan pages with elevated page_mapcount Mel Gorman
2013-07-17 5:22 ` Sam Ben
2013-07-31 9:13 ` Mel Gorman
2013-07-15 15:20 ` [PATCH 14/18] sched: Remove check that skips small VMAs Mel Gorman
2013-07-15 15:20 ` [PATCH 15/18] sched: Set preferred NUMA node based on number of private faults Mel Gorman
2013-07-18 1:53 ` [PATCH 15/18] fix compilation with !CONFIG_NUMA_BALANCING Rik van Riel
2013-07-31 9:19 ` Mel Gorman
2013-07-26 11:20 ` [PATCH 15/18] sched: Set preferred NUMA node based on number of private faults Peter Zijlstra
2013-07-31 9:29 ` Mel Gorman
2013-07-31 9:34 ` Peter Zijlstra
2013-07-31 10:10 ` Mel Gorman
2013-07-15 15:20 ` [PATCH 16/18] sched: Avoid overloading CPUs on a preferred NUMA node Mel Gorman
2013-07-15 20:03 ` Peter Zijlstra
2013-07-16 8:23 ` Mel Gorman
2013-07-16 10:35 ` Peter Zijlstra
2013-07-16 15:55 ` Hillf Danton
2013-07-16 16:01 ` Mel Gorman
2013-07-17 10:54 ` Peter Zijlstra
2013-07-31 9:49 ` Mel Gorman
2013-08-01 7:10 ` Srikar Dronamraju
2013-08-01 15:42 ` Mel Gorman
2013-07-15 15:20 ` [PATCH 17/18] sched: Retry migration of tasks to CPU on a preferred node Mel Gorman
2013-07-25 10:33 ` Peter Zijlstra
2013-07-31 10:03 ` Mel Gorman
2013-07-31 10:05 ` Peter Zijlstra
2013-07-31 10:07 ` Mel Gorman
2013-07-25 10:35 ` Peter Zijlstra
2013-08-01 5:13 ` Srikar Dronamraju [this message]
2013-08-01 15:46 ` Mel Gorman
2013-07-15 15:20 ` [PATCH 18/18] sched: Swap tasks when reschuling if a CPU on a target node is imbalanced Mel Gorman
2013-07-15 20:11 ` Peter Zijlstra
2013-07-16 9:41 ` Mel Gorman
2013-08-01 4:59 ` Srikar Dronamraju
2013-08-01 15:48 ` Mel Gorman
2013-07-15 20:14 ` [PATCH 0/18] Basic scheduler support for automatic NUMA balancing V5 Peter Zijlstra
2013-07-16 15:10 ` Srikar Dronamraju
2013-07-25 10:36 ` Peter Zijlstra
2013-07-31 10:30 ` Mel Gorman
2013-07-31 10:48 ` Peter Zijlstra
2013-07-31 11:57 ` Mel Gorman
2013-07-31 15:30 ` Peter Zijlstra
2013-07-31 16:11 ` Mel Gorman
2013-07-31 16:39 ` Peter Zijlstra
2013-08-01 15:51 ` Mel Gorman
2013-07-25 10:38 ` [PATCH] mm, numa: Sanitize task_numa_fault() callsites Peter Zijlstra
2013-07-31 11:25 ` Mel Gorman
2013-07-25 10:41 ` [PATCH] sched, numa: Improve scanner Peter Zijlstra
2013-07-25 10:46 ` [PATCH] mm, sched, numa: Create a per-task MPOL_INTERLEAVE policy Peter Zijlstra
2013-07-26 9:55 ` Peter Zijlstra
2013-08-26 16:10 ` Peter Zijlstra
2013-08-26 16:14 ` Peter Zijlstra
2013-07-30 11:24 ` [PATCH] mm, numa: Change page last {nid,pid} into {cpu,pid} Peter Zijlstra
2013-08-01 22:33 ` Rik van Riel
2013-07-30 11:38 ` [PATCH] sched, numa: Use {cpu, pid} to create task groups for shared faults Peter Zijlstra
2013-07-31 15:07 ` Peter Zijlstra
2013-07-31 15:38 ` Peter Zijlstra
2013-07-31 15:45 ` Don Morris
2013-07-31 16:05 ` Peter Zijlstra
2013-08-02 16:47 ` [PATCH -v3] " Peter Zijlstra
2013-08-02 16:50 ` [PATCH] mm, numa: Do not group on RO pages Peter Zijlstra
2013-08-02 19:56 ` Peter Zijlstra
2013-08-05 19:36 ` [PATCH] numa,sched: use group fault statistics in numa placement Rik van Riel
2013-08-09 13:55 ` Don Morris
2013-08-28 16:41 ` [PATCH -v3] sched, numa: Use {cpu, pid} to create task groups for shared faults Peter Zijlstra
2013-08-28 17:10 ` Rik van Riel
2013-08-01 6:23 ` [PATCH,RFC] numa,sched: use group fault statistics in numa placement Rik van Riel
2013-08-01 10:37 ` Peter Zijlstra
2013-08-01 16:35 ` Rik van Riel
2013-08-01 22:36 ` [RFC PATCH -v2] " Rik van Riel
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