linux-kernel - Re: [PATCH v5 7/9] KVM-GST: KVM Steal time accounting

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Message-ID: <20110705193704.GG3436@mgebm.net>
Date:	Tue, 5 Jul 2011 15:37:04 -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 7/9] KVM-GST: KVM Steal time accounting

On Mon, 04 Jul 2011, Glauber Costa wrote:

> This patch accounts steal time time in account_process_tick.
> If one or more tick is considered stolen in the current
> accounting cycle, user/system accounting is skipped. Idle is fine,
> since the hypervisor does not report steal time if the guest
> is halted.
> 
> Accounting steal time from the core scheduler give us the
> advantage of direct acess to the runqueue data. In a later
> opportunity, it can be used to tweak cpu power and make
> the scheduler aware of the time it lost.
> 
> 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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