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

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Message-ID: <53B273A2.5050500@linux.vnet.ibm.com>
Date:	Tue, 01 Jul 2014 16:38:58 +0800
From:	Michael wang <wangyun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 07/01/2014 04:20 PM, Peter Zijlstra wrote:
[snip]
>>
>> 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.

Fair enough... but is there any suggestions on how to handle this issue?

Currently when dbench running with stress, it could only gain one CPU,
and cpu-cgroup cpu.shares is meaningless, is there any good methods to
address that?

Regards,
Michael Wang

> 

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