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From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org,
	preeti@linux.vnet.ibm.com, Morten.Rasmussen@arm.com,
	kamalesh@linux.vnet.ibm.com, linux@arm.linux.org.uk,
	linux-arm-kernel@lists.infradead.org, riel@redhat.com,
	efault@gmx.de, nicolas.pitre@linaro.org,
	linaro-kernel@lists.linaro.org
Subject: Re: [PATCH v8 10/10] sched: make scale_rt invariant with frequency
Date: Mon, 3 Nov 2014 16:51:29 +0100	[thread overview]
Message-ID: <20141103155129.GK12706@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <1414745252-4895-11-git-send-email-vincent.guittot@linaro.org>

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.

  reply	other threads:[~2014-11-03 15:51 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-31  8:47 [PATCH v8 00/10] sched: consolidation of CPU capacity and usage Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 01/10] sched: add per rq cpu_capacity_orig Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 02/10] sched: remove frequency scaling from cpu_capacity Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 03/10] sched: move cfs task on a CPU with higher capacity Vincent Guittot
2014-11-04  8:30   ` Wanpeng Li
2014-11-04  9:41     ` Vincent Guittot
2014-11-04 10:42       ` Wanpeng Li
2014-11-04 11:10         ` Vincent Guittot
2014-11-18 10:47   ` Wanpeng Li
2014-11-18 11:00     ` Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 04/10] sched: add utilization_avg_contrib Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 05/10] sched: Track group sched_entity usage contributions Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 06/10] sched: get CPU's usage statistic Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 07/10] sched: replace capacity_factor by usage Vincent Guittot
2014-11-03  7:01   ` Wanpeng Li
2014-11-03 10:59     ` Vincent Guittot
2014-11-03 15:29   ` Peter Zijlstra
2014-10-31  8:47 ` [PATCH v8 08/10] sched: add SD_PREFER_SIBLING for SMT level Vincent Guittot
2014-11-04  3:21   ` Wanpeng Li
2014-11-04  8:58     ` Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 09/10] sched: Make sched entity usage tracking scale-invariant Vincent Guittot
2014-10-31  8:47 ` [PATCH v8 10/10] sched: make scale_rt invariant with frequency Vincent Guittot
2014-11-03 15:51   ` Peter Zijlstra [this message]
2014-11-03 16:14     ` Vincent Guittot
2014-11-03  2:12 ` [PATCH v8 00/10] sched: consolidation of CPU capacity and usage Wanpeng Li
2014-11-03 10:55   ` Vincent Guittot
2014-11-03 13:03     ` Wanpeng Li

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