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From: Peter Zijlstra <peterz@infradead.org>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, chegu_vinod@hp.com,
	mgorman@suse.de, mingo@kernel.org
Subject: Re: [PATCH 9/7] sched,numa: remove task_h_load from task_numa_compare
Date: Wed, 25 Jun 2014 07:57:08 +0200	[thread overview]
Message-ID: <20140625055708.GG6758@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <53AA608F.50301@redhat.com>

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On Wed, Jun 25, 2014 at 01:39:27AM -0400, Rik van Riel wrote:
> 
> Here it goes:
> 
> When CONFIG_FAIR_GROUP_SCHED is enabled, the load that a task places
> on a CPU is determined by the group the task is in. The active groups
> on the source and destination CPU can be different, resulting in a
> different load contribution by the same task at its source and at its
> destination. As a result, the load needs to be calculated separately
> for each CPU, instead of estimated once with task_h_load.
> 
> Getting this calculation right allows some workloads to converge,
> where previously the last thread could get stuck on another node,
> without being able to migrate to its final destination.
> 

Thanks!

> 
> 
> - -- 
> All rights reversed
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http://www.tummy.com/blogs/2008/09/05/enigmail-message-composition-and-mutt/

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      reply	other threads:[~2014-06-25  5:57 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-23 15:41 [PATCH 0/7] sched,numa: improve NUMA convergence times riel
2014-06-23 15:41 ` [PATCH 1/7] sched,numa: use group's max nid as task's preferred nid riel
2014-06-25 10:31   ` Mel Gorman
2014-07-05 10:44   ` [tip:sched/core] sched/numa: Use group's max nid as task' s " tip-bot for Rik van Riel
2014-06-23 15:41 ` [PATCH 3/7] sched,numa: use effective_load to balance NUMA loads riel
2014-06-23 15:41 ` [PATCH 4/7] sched,numa: simplify task_numa_compare riel
2014-06-25 10:39   ` Mel Gorman
2014-06-23 15:41 ` [PATCH 5/7] sched,numa: examine a task move when examining a task swap riel
2014-06-23 15:41 ` [PATCH 6/7] sched,numa: rework best node setting in task_numa_migrate riel
2014-07-05 10:45   ` [tip:sched/core] sched/numa: Rework best node setting in task_numa_migrate() tip-bot for Rik van Riel
2014-06-23 15:41 ` [PATCH 7/7] sched,numa: change scan period code to match intent riel
2014-06-25 10:19   ` Mel Gorman
2014-07-05 10:45   ` [tip:sched/core] sched/numa: Change " tip-bot for Rik van Riel
2014-06-23 22:30 ` [PATCH 8/7] sched,numa: do not let a move increase the imbalance Rik van Riel
2014-06-24 14:38   ` Peter Zijlstra
2014-06-24 15:30     ` Rik van Riel
2014-06-25  1:57     ` Rik van Riel
2014-06-24 19:14 ` [PATCH 9/7] sched,numa: remove task_h_load from task_numa_compare Rik van Riel
2014-06-25  5:07   ` Peter Zijlstra
2014-06-25  5:09     ` Rik van Riel
2014-06-25  5:21     ` Peter Zijlstra
2014-06-25  5:25       ` Rik van Riel
2014-06-25  5:31         ` Peter Zijlstra
2014-06-25  5:39           ` Rik van Riel
2014-06-25  5:57             ` Peter Zijlstra [this message]

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