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Date: Fri, 5 Nov 2010 13:14:43 +0200
From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Oleg Nesterov <oleg@redhat.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Roland McGrath <roland@redhat.com>,
        David Howells <dhowells@redhat.com>, linux-kernel@vger.kernel.org,
        Marcelo Tosatti <mtosatti@redhat.com>, Ingo Molnar <mingo@elte.hu>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: task blocked for more than 120 seconds
Message-ID: <20101105111443.GD3930@swordfish>
References: <20101104155826.GC13818@swordfish.minsk.epam.com>
 <20101104161943.GA6520@arch.trippelsdorf.de>
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On (11/04/10 18:32), Peter Zijlstra wrote:
> Subject: sched: Fixup cross sched_class wakeup preemption
> From: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Date: Sun Oct 31 12:37:04 CET 2010
>=20
> Instead of dealing with sched classes inside each check_preempt_curr()
> implementation, pull out this logic into the generic wakeup preemption
> path.
>=20
> This fixes a hang in KVM (and others) where we are waiting for the
> stop machine thread to run..
>=20

Hello,

Peter, patch seems to work.


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


	Sergey

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