linux-kernel - Re: [PATCH v2 0/2] Quieten softlockup detector on virtualised kernels

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Date:	Mon, 2 Feb 2015 15:08:39 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cyril Bur <cyrilbur@...il.com>
Cc:	mpe@...erman.id.au, drjones@...hat.com, dzickus@...hat.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	uobergfe@...hat.com, chaiw.fnst@...fujitsu.com, fabf@...net.be,
	atomlin@...hat.com, benzh@...omium.org, schwidefsky@...ibm.com
Subject: Re: [PATCH v2 0/2] Quieten softlockup detector on virtualised
 kernels

On Mon, 02 Feb 2015 15:58:38 +1100 Cyril Bur <cyrilbur@...il.com> wrote:

> On Fri, 2015-01-09 at 14:34 +1100, Cyril Bur wrote:
> > When the hypervisor pauses a virtualised kernel the kernel will observe a jump
> > in timebase, this can cause spurious messages from the softlockup detector.
> > 
> > Whilst these messages are harmless, they are accompanied with a stack trace
> > which causes undue concern and more problematically the stack trace in the
> > guest has nothing to do with the observed problem and can only be misleading.
> > 
> > Futhermore, on POWER8 this is completely avoidable with the introduction of
> > the Virtual Time Base (VTB) register.
> > 

(Top-posting repaired.  Please don't).

> Could you please pick these patches up through your tree?

I shall.  There were quite a few review comments last time and I *think*
they've been addressed(?).  I'll cc the involved parties on the commits
- please check?

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