linux-kernel - Re: Test for CFS Bandwidth Control V6

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Message-ID: <4DDB64C1.90709@cn.fujitsu.com>
Date:	Tue, 24 May 2011 15:56:49 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
CC:	Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Hu Tao <hutao@...fujitsu.com>
Subject: Re: Test for CFS Bandwidth Control V6

On 05/24/2011 08:53 AM, Hidetoshi Seto wrote:

> I confirmed that running your test cause hung-up on my box.
> And after some investigation, I found that this is an infinite loop
> in migrate_task() due to miscalculation of rq->nr_running; when a
> task is queued to throttled entity the nr_running is incremented at
> the queuing and also the unthrottling.
> 
> I made a fix for this bug and it seems works well for me.
> Could you try this patch and give us your feedback, Xiao?
> 

Thanks for your nice fix, Seto! Everything goes well now!

Tested-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
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