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Message-ID: <20070314203826.GA15394@elte.hu> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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