linux-kernel - Re: [PATCH v2 3/6] KVM-GST: KVM Steal time accounting

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Message-ID: <4D437316.1080901@redhat.com>
Date:	Fri, 28 Jan 2011 20:53:26 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Glauber Costa <glommer@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	aliguori@...ibm.com,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH v2 3/6] KVM-GST: KVM Steal time accounting

On 01/28/2011 02:52 PM, Glauber Costa wrote:
> This patch accounts steal time time in kernel/sched.
> I kept it from last proposal, because I still see advantages
> in it: Doing it here will give us easier access from scheduler
> variables such as the cpu rq. The next patch shows an example of
> usage for it.
>
> Since functions like account_idle_time() can be called from
> multiple places, not only account_process_tick(), steal time
> grabbing is repeated in each account function separatedely.
>
> 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>

Not the traditional way of doing steal time, but a lot cleaner
than the legacy code that's left over from when each clocksource
had its own interrupt function.

I like it.

Acked-by: Rik van Riel <riel@...hat.com>

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