linux-kernel - Re: task blocked for more than 120 seconds

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Date:	Fri, 5 Nov 2010 13:14:43 +0200
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Roland McGrath <roland@...hat.com>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: task blocked for more than 120 seconds

On (11/04/10 18:32), Peter Zijlstra wrote:
> Subject: sched: Fixup cross sched_class wakeup preemption
> From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Date: Sun Oct 31 12:37:04 CET 2010
> 
> Instead of dealing with sched classes inside each check_preempt_curr()
> implementation, pull out this logic into the generic wakeup preemption
> path.
> 
> This fixes a hang in KVM (and others) where we are waiting for the
> stop machine thread to run..
> 

Hello,

Peter, patch seems to work.


Tested-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>


	Sergey

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