[PATCH v8 10/10] sched: make scale_rt invariant with frequency

Vincent Guittot vincent.guittot at linaro.org
Mon Nov 3 08:14:15 PST 2014

On 3 November 2014 16:51, Peter Zijlstra <peterz at infradead.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.


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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