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

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Date:	Mon, 19 Dec 2011 14:59:10 +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 12/16/2011 11:31 AM, Marcelo Tosatti wrote:
> > >
> > > 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!
>
> No, but your host system is in such a load state that for the sake of
> system usability you better print out a warning message.

What's the point in printing it in the guest?  The guest can't observe
host conditions.

> I don't see the advantage of preempt notifiers over the simple, paravirt
> solution proposed? Note kvmclock is already paravirt.

Right.

> What do you want to be done in preempt notifiers? Measure what to
> consider setting this flag?

Preemption while TASK_RUNNING or TASK_UNINTERRUPTIBLE.

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

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