linux-kernel - Re: [PATCH] sched: select 'idle' cfs_rq per task-group to prevent tg-internal imbalance

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Message-ID: <20140701082020.GL6758@twins.programming.kicks-ass.net>
Date:	Tue, 1 Jul 2014 10:20:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michael wang <wangyun@...ux.vnet.ibm.com>
Cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...nel.org>, Alex Shi <alex.shi@...aro.org>,
	Paul Turner <pjt@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: select 'idle' cfs_rq per task-group to prevent
 tg-internal imbalance

On Tue, Jun 24, 2014 at 11:34:54AM +0800, Michael wang wrote:
> On 06/23/2014 05:42 PM, Peter Zijlstra wrote:
> [snip]
> >> +}
> > 
> > Still completely hate this, it doesn't make sense conceptual sense what
> > so ever.
> 
> Yeah... and now I agree your opinion that this could not address all the
> cases after all the testing these days...
> 
> Just wondering could we make this another scheduler feature?

No; sched_feat() is for debugging, BIG CLUE: its guarded by
CONFIG_SCHED_DEBUG, anybody using it in production or anywhere else is
broken.

If people are using it, I should remove or at least randomize the
interface.

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