From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755418Ab3HWKcb (ORCPT ); Fri, 23 Aug 2013 06:32:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47519 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754903Ab3HWKca (ORCPT ); Fri, 23 Aug 2013 06:32:30 -0400 Date: Fri, 23 Aug 2013 13:31:43 +0300 From: Gleb Natapov To: Peter Zijlstra Cc: Marcelo Tosatti , mingo@redhat.com, glommer@parallels.com, tglx@linutronix.de, jeremy@goop.org, rostedt@goodmis.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] remove sched notifier for cross-cpu migrations Message-ID: <20130823103143.GC15513@redhat.com> References: <20130710103440.GO25631@dyad.programming.kicks-ass.net> <20130711012157.GA21489@amt.cnet> <20130823102230.GS31370@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130823102230.GS31370@twins.programming.kicks-ass.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > > 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. -- Gleb.