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

From: Peter Zijlstra
Date: Thu Jul 11 2013 - 05:53:49 EST


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@xxxxxxxxxx>

Awesome, thanks!

Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
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