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

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Message-ID: <4EE9C274.3030603@redhat.com>
Date:	Thu, 15 Dec 2011 11:48:36 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Eric B Munson <emunson@...bm.net>
CC:	mingo@...hat.com, hpa@...or.com, arnd@...db.de,
	ryanh@...ux.vnet.ibm.com, aliguori@...ibm.com, mtosatti@...hat.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 07:58 PM, Eric B Munson wrote:
> > I don't think you should see a guest softlockup if the host is
> > overloaded.  Nor should you see it due to a long live migration pause,
> > or STOP/CONT.  You should see a guest softlockup if it is spinning due
> > to a guest bug, and not for any other reason.
> > 
> > I think we need a mix of the ioctl (for STOP/CONT and voluntary pauses,
> > like live migration or qemu stop/cont) and preempt notifiers (together
> > with a check for TASK_RUNNING/TASK_UNINTERRUPTIBLE, for scheduling or
> > swap delays)
> > 
>
> Do you want the preemption notifier work in before you will consider merging
> this set, or can that be a follow on?

Yes please.

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

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