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Re: [PATCH v2 1/2] cpufreq: Make iowait boost a policy option

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On Thu, May 18, 2017 at 11:23:43PM -0700, Joel Fernandes wrote:
> Make iowait boost a cpufreq policy option and enable it for intel_pstate
> cpufreq driver. Governors like schedutil can use it to determine if
> boosting for tasks that wake up with p->in_iowait set is needed.

Rather than just flat out disabling the option, is there something
better we can do on ARM?

The reason for the IO-wait boost is to ensure we feed our external
devices data ASAP, this reduces wait times, increases throughput and
decreases the duration the devices have to operate.

I realize max freq/volt might not be the best option for you, but is
there another spot that would make sense? I can imagine you want to
return your MMC to low power state ASAP as well.


So rather than a disable flag, I would really rather see an IO-wait OPP
state selector or something.

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[PATCH v2 0/2] Make iowait_boost optional and default to policy Joel Fernandes <joelaf@google.com> - 2017-05-19 08:30 +0200
  [PATCH v2 2/2] sched: Make iowait_boost optional in schedutil Joel Fernandes <joelaf@google.com> - 2017-05-19 08:30 +0200
    Re: [PATCH v2 2/2] sched: Make iowait_boost optional in schedutil Viresh Kumar <viresh.kumar@linaro.org> - 2017-05-19 09:00 +0200
      Re: [PATCH v2 2/2] sched: Make iowait_boost optional in schedutil Joel Fernandes <joelaf@google.com> - 2017-05-19 18:20 +0200
  [PATCH v2 1/2] cpufreq: Make iowait boost a policy option Joel Fernandes <joelaf@google.com> - 2017-05-19 08:30 +0200
    Re: [PATCH v2 1/2] cpufreq: Make iowait boost a policy option Peter Zijlstra <peterz@infradead.org> - 2017-05-19 11:50 +0200
      Re: [PATCH v2 1/2] cpufreq: Make iowait boost a policy option Peter Zijlstra <peterz@infradead.org> - 2017-05-19 12:30 +0200
      Re: [PATCH v2 1/2] cpufreq: Make iowait boost a policy option Joel Fernandes <joelaf@google.com> - 2017-05-19 19:10 +0200
        Re: [PATCH v2 1/2] cpufreq: Make iowait boost a policy option Peter Zijlstra <peterz@infradead.org> - 2017-05-22 10:30 +0200
          Re: [PATCH v2 1/2] cpufreq: Make iowait boost a policy option Joel Fernandes <joelaf@google.com> - 2017-05-24 22:20 +0200

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