linux-kernel - Re: [PATCH 16/16] KVM-GST: adjust scheduler cpu power

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Message-ID: <1295898790.28776.474.camel@laptop>
Date:	Mon, 24 Jan 2011 20:53:10 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Glauber Costa <glommer@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	aliguori@...ibm.com, Rik van Riel <riel@...hat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH 16/16] KVM-GST: adjust scheduler cpu power

On Mon, 2011-01-24 at 16:51 -0200, Glauber Costa wrote:
> 
> > I thought kvm had a ns resolution steal-time clock?
> Yes, the one I introduced earlier in this series is nsec. However, user
> and system will be accounted in usec at most, so there is no point in
> using nsec here.

Well, the scheduler accounts most things in ns these days -- some archs
even do user/sys time in ns -- using ticks is really very crude, esp
when you've got better information.
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