linux-kernel - Re: [PATCH] remove sched notifier for cross-cpu migrations

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Message-ID: <20130823103452.GT31370@twins.programming.kicks-ass.net>
Date:	Fri, 23 Aug 2013 12:34:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, mingo@...hat.com,
	glommer@...allels.com, tglx@...utronix.de, jeremy@...p.org,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remove sched notifier for cross-cpu migrations

On Fri, Aug 23, 2013 at 01:31:43PM +0300, Gleb Natapov wrote:
> On Fri, Aug 23, 2013 at 12:22:30PM +0200, Peter Zijlstra wrote:
> > On Wed, Jul 10, 2013 at 10:21:57PM -0300, Marcelo Tosatti wrote:
> > > 
> > > Linux as a guest on KVM hypervisor, the only user of the pvclock      
> > > vsyscall interface, does not require notification on task migration 
> > > because:
> > > 
> > > 1. cpu ID number maps 1:1 to per-CPU pvclock time info.
> > > 2. per-CPU pvclock time info is updated if the
> > >    underlying CPU changes.
> > > 3. that version is increased whenever underlying CPU 
> > >    changes.
> > > 
> > > Which is sufficient to guarantee nanoseconds counter
> > > is calculated properly.
> > > 
> > > Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>
> > 
> > What happened to this patch? I don't see it in my current tree, nor do I
> > find it in the kvm tree.
> > 
> e04c5d76b0cfb66cadd900cf147526f2271884b8 in kvm.git next branch.

Awesome, thanks!
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