linux-kernel - Re: sched: hang in migrate

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Date:	Mon, 24 Feb 2014 18:14:24 +0800
From:	Michael wang <wangyun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Sasha Levin <sasha.levin@...cle.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sched: hang in migrate_swap

On 02/24/2014 03:10 PM, Peter Zijlstra wrote:
> On Mon, Feb 24, 2014 at 01:19:15PM +0800, Michael wang wrote:
>> Peter, do we accidentally missed this commit?
>>
>> http://git.kernel.org/tip/477af336ba06ef4c32e97892bb0d2027ce30f466
> 
> Ingo dropped it on Saturday because it makes locking_selftest() unhappy.
> 
> That is because we call locking_selftest() way before we're ready to
> call schedule() and guess what it does :-/
> 
> I'm not entirely sure what to do.. ideally I'd shoot locking_selftest in
> the head, but clearly that's not entirely desired either.

...what about move idle_balance() back to it's old position?

pull_rt_task() logical could be after idle_balance() if still no FAIR
and DL, then go into the pick loop, that may could make things more
clean & clear, should we have a try?

Regards,
Michael Wang

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