From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755011Ab1GFRlL (ORCPT ); Wed, 6 Jul 2011 13:41:11 -0400 Received: from mx1.redhat.com ([209.132.183.28]:10475 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752955Ab1GFRlK (ORCPT ); Wed, 6 Jul 2011 13:41:10 -0400 Message-ID: <4E149E0E.30303@redhat.com> Date: Wed, 06 Jul 2011 13:40:30 -0400 From: Rik van Riel User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc15 Lightning/1.0b3pre Thunderbird/3.1.10 MIME-Version: 1.0 To: Glauber Costa CC: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeremy Fitzhardinge , Peter Zijlstra , Avi Kivity , Anthony Liguori , Eric B Munson Subject: Re: [PATCH v5 8/9] KVM-GST: adjust scheduler cpu power References: <1309793548-16714-1-git-send-email-glommer@redhat.com> <1309793548-16714-9-git-send-email-glommer@redhat.com> In-Reply-To: <1309793548-16714-9-git-send-email-glommer@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/04/2011 11:32 AM, Glauber Costa wrote: > This patch makes update_rq_clock() aware of steal time. > The mechanism of operation is not different from irq_time, > and follows the same principles. This lives in a CONFIG > option itself, and can be compiled out independently of > the rest of steal time reporting. The effect of disabling it > is that the scheduler will still report steal time (that cannot be > disabled), but won't use this information for cpu power adjustments. > > Everytime update_rq_clock_task() is invoked, we query information > about how much time was stolen since last call, and feed it into > sched_rt_avg_update(). > > Although steal time reporting in account_process_tick() keeps > track of the last time we read the steal clock, in prev_steal_time, > this patch do it independently using another field, > prev_steal_time_rq. This is because otherwise, information about time > accounted in update_process_tick() would never reach us in update_rq_clock(). > > Signed-off-by: Glauber Costa > CC: Rik van Riel > CC: Jeremy Fitzhardinge > CC: Peter Zijlstra > CC: Avi Kivity > CC: Anthony Liguori > CC: Eric B Munson Acked-by: Rik van Riel -- All rights reversed