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Date:	Fri, 23 Aug 2013 12:22:30 +0200
From:	Peter Zijlstra <>
To:	Marcelo Tosatti <>
Subject: Re: [PATCH] remove sched notifier for cross-cpu migrations

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 <>

What happened to this patch? I don't see it in my current tree, nor do I
find it in the kvm tree.

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