linux-kernel - Re: [PATCH 9/7] sched,numa: remove task_h_load from task_numa

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Message-ID: <20140625055708.GG6758@twins.programming.kicks-ass.net>
Date:	Wed, 25 Jun 2014 07:57:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, chegu_vinod@...com, mgorman@...e.de,
	mingo@...nel.org
Subject: Re: [PATCH 9/7] sched,numa: remove task_h_load from task_numa_compare

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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