Messages in this thread | | | Date | Thu, 11 Jul 2013 11:52:49 +0200 | From | Peter Zijlstra <> | 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 <mtosatti@redhat.com>
Awesome, thanks!
Acked-by: Peter Zijlstra <peterz@infradead.org>
| |