linux-kernel - Re: [PATCH v5 4/9] KVM-HV: KVM Steal time implementation

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Message-ID: <20110705193633.GD3436@mgebm.net>
Date:	Tue, 5 Jul 2011 15:36:33 -0400
From:	Eric B Munson <emunson@...bm.net>
To:	Glauber Costa <glommer@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rik van Riel <riel@...hat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Avi Kivity <avi@...hat.com>,
	Anthony Liguori <aliguori@...ibm.com>
Subject: Re: [PATCH v5 4/9] KVM-HV: KVM Steal time implementation

On Mon, 04 Jul 2011, 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 <glommer@...hat.com>
> CC: Rik van Riel <riel@...hat.com>
> CC: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> CC: Peter Zijlstra <peterz@...radead.org>
> CC: Avi Kivity <avi@...hat.com>
> CC: Anthony Liguori <aliguori@...ibm.com>
> CC: Eric B Munson <emunson@...bm.net>

Tested-by: Eric B Munson <emunson@...bm.net>

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