Re: [PATCH RESEND v9 00/10] sched: consolidation of CPU capacity and usage

From: Morten Rasmussen
Date: Thu Feb 19 2015 - 07:48:47 EST

On Thu, Jan 15, 2015 at 10:09:20AM +0000, Vincent Guittot wrote:
> This patchset consolidates several changes in the capacity and the usage
> tracking of the CPU. It provides a frequency invariant metric of the usage of
> CPUs and generally improves the accuracy of load/usage tracking in the
> scheduler. The frequency invariant metric is the foundation required for the
> consolidation of cpufreq and implementation of a fully invariant load tracking.
> These are currently WIP and require several changes to the load balancer
> (including how it will use and interprets load and capacity metrics) and
> extensive validation. The frequency invariance is done with
> arch_scale_freq_capacity and this patchset doesn't provide the backends of
> the function which are architecture dependent.
> As discussed at LPC14, Morten and I have consolidated our changes into a single
> patchset to make it easier to review and merge.

I'm happy with patch 1, 3, 5, 6, and 7. Add my acked-by if you like :)

The last few needs buy-in from somebody running SMT systems I think.

Also, it still not clear why patch 10 uses relative capacity reduction
instead of absolute capacity available to CFS tasks.

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