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

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Message-ID: <20141103155129.GK12706@worktop.programming.kicks-ass.net>
Date:	Mon, 3 Nov 2014 16:51:29 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	preeti@...ux.vnet.ibm.com, Morten.Rasmussen@....com,
	kamalesh@...ux.vnet.ibm.com, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, riel@...hat.com,
	efault@....de, nicolas.pitre@...aro.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH v8 10/10] sched: make scale_rt invariant with frequency

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.
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