linux-kernel - Re: [RFC][PATCH v2 4/7] taskstats: Add per task steal time accounting

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Date:	Tue, 16 Nov 2010 10:39:24 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	Shailabh Nagar <nagar1234@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>, Oleg Nesterov <oleg@...hat.com>,
	John stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland McGrath <roland@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [RFC][PATCH v2 4/7] taskstats: Add per task steal time accounting

On 11/16/2010 08:05 AM, Martin Schwidefsky wrote:
>>> Yes and no. The tracepoint idea looks interesting in itself. But that does
>>> not completely replace the per-task steal time. The hypervisor can take
>>> away the cpu anytime, it is still interesting to know which task was hit
>>> hardest by that. You could view the cpu time lost by a hypercall as
>>> "synchronous" steal time for the task, the remaining delta to the total
>>> per-task steal time as "asynchronous" steal time. 
>> Right, so there is no way the guest knows about the vcpu getting
>> scheduled, it can only derive the fact from hardware clocks after the
>> fact?
> Correct.

Yes, same for Xen.

    J

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