linux-kernel - Re: [PATCH v2 4/6] KVM-GST: KVM Steal time registration

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Message-ID: <1296582252.26581.255.camel@laptop>
Date:	Tue, 01 Feb 2011 18:44:12 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Glauber Costa <glommer@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, aliguori@...ibm.com,
	Rik van Riel <riel@...hat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Venkatesh Pallipadi <venki@...gle.com>
Subject: Re: [PATCH v2 4/6] KVM-GST: KVM Steal time registration

On Tue, 2011-02-01 at 15:00 -0200, Glauber Costa wrote:
> 
> > What you can do is: steal_ticks = steal_time_clock() / TICK_NSEC, or
> > simply keep a steal time delta and every time it overflows
> > cputime_one_jiffy insert a steal-time tick.
> 
> What do you think about keeping accounting in msec/usec resolution and
> (thus allowing us to compute half a tick to user/system, other half to
> steal time) only change it to cputime in the last minute?

its only accounting full tick..

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