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

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Date:	Sat, 13 Nov 2010 20:38:02 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
Cc:	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>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [RFC][PATCH v2 4/7] taskstats: Add per task steal time
 accounting

On Thu, 2010-11-11 at 18:03 +0100, Michael Holzheu wrote:
> From: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
> 
> Currently steal time is only accounted for the whole system. With this
> patch we add steal time to the per task CPU time accounting.
> The triplet "user time", "system time" and "steal time" represents
> all consumed CPU time on hypervisor based systems. 

Does that really make sense? Its not like the hypervisor really knows
anything about tasks and won't steal from one? Its really a vcpu
feature.

What added benefit will all this extra accounting give?
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