Messages in this thread | | | Date | Thu, 30 Mar 2017 09:58:05 +0100 | From | Juri Lelli <> | Subject | Re: [RFD PATCH 4/5] sched/cpufreq_schedutil: always consider all CPUs when deciding next freq |
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Hi,
On 30/03/17 00:41, Rafael J. Wysocki wrote: > On Friday, March 24, 2017 02:08:59 PM Juri Lelli wrote: > > No assumption can be made upon the rate at which frequency updates get > > triggered, as there are scheduling policies (like SCHED_DEADLINE) which > > don't trigger them so frequently. > > > > Remove such assumption from the code. > > But the util/max values for idle CPUs may be stale, no? >
Right, that might be a problem. A proper solution I think would be to remotely update such values for idle CPUs, and I believe Vincent is working on a patch for that.
As mid-term workarounds, changing a bit the current one, come to my mind:
- consider TICK_NSEC (continue) only when SCHED_CPUFREQ_DL is not set - remove CFS contribution (without triggering a freq update) when a CPU enters IDLE; this might not work well, though, as we probably want to keep in blocked util contribution for a bit
What you think is the way to go?
Thanks,
- Juri
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