linux-kernel - Re: [PATCH 0/5 V5] Avoid soft lockup message when KVM is stopped by host

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Message-ID: <4EE9CA1C.3010801@redhat.com>
Date:	Thu, 15 Dec 2011 12:21:16 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Eric B Munson <emunson@...bm.net>, mingo@...hat.com, hpa@...or.com,
	arnd@...db.de, ryanh@...ux.vnet.ibm.com, aliguori@...ibm.com,
	jeremy.fitzhardinge@...rix.com, levinsasha928@...il.com,
	Jan Kiszka <jan.kiszka@...mens.com>, kvm@...r.kernel.org,
	linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5 V5] Avoid soft lockup message when KVM is stopped
 by host

On 12/14/2011 08:21 PM, Marcelo Tosatti wrote:
> On Wed, Dec 14, 2011 at 04:39:56PM +0200, Avi Kivity wrote:
> > On 12/14/2011 02:16 PM, Marcelo Tosatti wrote:
> > > > Having this controlled from userspace means it doesn't work for SIGSTOP
> > > > or for long scheduling delays.  What about doing this automatically
> > > > based on preempt notifiers?
> > >
> > > Long scheduling delays should be considered hangups from the guest
> > > perspective.
> > 
> > Why?  To the guest it looks like slow hardware, but it will interpret it
> > as a softlockup.
>
> Slow enough that progress of the watchdog thread is unable to keep up
> with timer interrupt processing. This is considered a hang and
> should be reported.

It's not a guest hang though!

-- 
error compiling committee.c: too many arguments to function

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