linux-kernel - Re: [PATCH v8 10/10] sched: make scale

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Message-ID: <CAKfTPtBQmhv1Lpjsak27m+GW=3tBuskRqv5UiL_cW7rGnVBp9g@mail.gmail.com>
Date:	Mon, 3 Nov 2014 17:14:15 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Rik van Riel <riel@...hat.com>,
	Mike Galbraith <efault@....de>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>
Subject: Re: [PATCH v8 10/10] sched: make scale_rt invariant with frequency

On 3 November 2014 16:51, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, Oct 31, 2014 at 09:47:32AM +0100, Vincent Guittot wrote:
>> The call to arch_scale_frequency_capacity in the rt scheduling path might be
>> a concern for RT folks because I'm not sure whether we can rely on
>> arch_scale_freq_capacity to be short and efficient ?
>
> Well, you put it in quite a hot path on the CFS side too, so it had
> better be blazing fast anyhow.
>
>
> That said, can you move all the running + invariance bits at the
> beginning of the patch set, these appear to be the least controversial
> bits and 'desired' by quite a few people, so we'll try and get those
> agreed upon and merged first.

ok

I'm going to resend with the following order

sched: add utilization_avg_contrib
sched: Track group sched_entity usage contributions
sched: remove frequency scaling from cpu_capacity
sched: Make sched entity usage tracking scale-invariant
sched: make scale_rt invariant with frequency
sched: add per rq cpu_capacity_orig
sched: get CPU's usage statistic
sched: replace capacity_factor by usage
sched: add SD_PREFER_SIBLING for SMT level
sched: move cfs task on a CPU with higher capacity
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