linux-kernel - Re: Stolen and degraded time and schedulers

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Date:	Wed, 14 Mar 2007 21:38:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Dan Hecht <dhecht@...are.com>, dwalker@...sta.com,
	cpufreq@...ts.linux.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Con Kolivas <kernel@...ivas.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	john stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>, paulus@...ibm.com,
	schwidefsky@...ibm.com, Rik van Riel <riel@...hat.com>
Subject: Re: Stolen and degraded time and schedulers


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> I added stolen time accounting to xen-pv_ops last night.  For Xen, at 
> least, it wasn't hard to fit into the clockevent infrastructure.  I 
> just update the stolen time accounting for each cpu when it gets a 
> timer tick; they seem to get a tick every couple of seconds even when 
> idle.

touching the 'timer tick' is the wrong approach. 'stolen time' only 
matters to the /scheduler tick/. So extend the hypervisor interface to 
allow the injection of 'virtual' scheduler tick events: via the use of a 
special clockevents device - do not change clockevents itself.

	Ingo
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