Messages in this thread | | | Date | Fri, 21 Nov 2014 12:35:26 +0000 | From | Morten Rasmussen <> | Subject | Re: [PATCH v9 03/10] sched: remove frequency scaling from cpu_capacity |
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On Mon, Nov 03, 2014 at 04:54:40PM +0000, Vincent Guittot wrote: > Now that arch_scale_cpu_capacity has been introduced to scale the original > capacity, the arch_scale_freq_capacity is no longer used (it was > previously used by ARM arch). Remove arch_scale_freq_capacity from the > computation of cpu_capacity. The frequency invariance will be handled in the > load tracking and not in the CPU capacity.
Just a note:
Yes, we are scaling the load tracking of each task to compensate for frequency scaling. I think that is all fine. Later we will have to feed the current frequency into the energy model as well to figure out if putting more tasks on a cpu will/should cause the frequency to increase or not. We don't need it for now and don't need to add it in the commit message. It is just a reminder that we may actually want to use arch_scale_freq_capacity() combined with cpu_capacity to provide this input to the energy model later.
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