linux-kernel - Re: [patch v5 06/15] sched: log the cpu utilization at rq

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Message-ID: <1361373740.10155.42.camel@laptop>
Date:	Wed, 20 Feb 2013 16:22:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	torvalds@...ux-foundation.org, mingo@...hat.com,
	tglx@...utronix.de, akpm@...ux-foundation.org,
	arjan@...ux.intel.com, bp@...en8.de, pjt@...gle.com,
	namhyung@...nel.org, efault@....de, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
	morten.rasmussen@....com
Subject: Re: [patch v5 06/15] sched: log the cpu utilization at rq

On Wed, 2013-02-20 at 22:33 +0800, Alex Shi wrote:
> > You don't actually compute the rq utilization, you only compute the
> > utilization as per the fair class, so if there's significant RT
> activity
> > it'll think the cpu is under-utilized, whihc I think will result in
> the
> > wrong thing.
> 
> yes. A bit complicit to resolve this. Any suggestions on this, guys?

Shouldn't be too hard seeing as we already track cpu utilization for !
fair usage; see rq::rt_avg and scale_rt_power.

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