From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: [PATCH v5 4/9] KVM-HV: KVM Steal time implementation Date: Wed, 06 Jul 2011 12:08:48 -0400 Message-ID: <4E148890.6070201@redhat.com> References: <1309793548-16714-1-git-send-email-glommer@redhat.com> <1309793548-16714-5-git-send-email-glommer@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeremy Fitzhardinge , Peter Zijlstra , Avi Kivity , Anthony Liguori , Eric B Munson To: Glauber Costa Return-path: In-Reply-To: <1309793548-16714-5-git-send-email-glommer@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 07/04/2011 11:32 AM, Glauber Costa wrote: > To implement steal time, we need the hypervisor to pass the guest > information about how much time was spent running other processes > outside the VM, while the vcpu had meaningful work to do - halt > time does not count. > > This information is acquired through the run_delay field of > delayacct/schedstats infrastructure, that counts time spent in a > runqueue but not running. > > Steal time is a per-cpu information, so the traditional MSR-based > infrastructure is used. A new msr, KVM_MSR_STEAL_TIME, holds the > memory area address containing information about steal time > > This patch contains the hypervisor part of the steal time infrasructure, > and can be backported independently of the guest portion. > > 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