Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition

From	"Rafael J. Wysocki" <rafael@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition
Date	2016-08-02 03:50 +0200
Message-ID	<s1x0e-628-3@gated-at.bofh.it> (permalink)
References	<s18Ex-6NS-1@gated-at.bofh.it> <s18Ex-6NS-17@gated-at.bofh.it> <s1wGW-5Vm-15@gated-at.bofh.it>
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On Tue, Aug 2, 2016 at 3:22 AM, Steve Muckle <steve.muckle@linaro.org> wrote:
> On Mon, Aug 01, 2016 at 01:37:23AM +0200, Rafael J. Wysocki wrote:
> ...
>> For this purpose, define a new cpufreq_update_util() flag
>> UUF_IO and modify enqueue_task_fair() to pass that flag to
>> cpufreq_update_util() in the in_iowait case.  That generally
>> requires cpufreq_update_util() to be called directly from there,
>> because update_load_avg() is not likely to be invoked in that
>> case.
>
> I didn't follow why the cpufreq hook won't likely be called if
> in_iowait is set? AFAICS update_load_avg() gets called in the second loop
> and calls update_cfs_rq_load_avg (triggers the hook).

In practice it turns out that in the majority of cases when in_iowait
is set the second loop will not run.

Thanks,
Rafael

Thread

[RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
  [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
    Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to  cpufreq_update_util() Dominik Brodowski <linux@dominikbrodowski.net> - 2016-08-01 10:00 +0200
      Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 17:10 +0200
        Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to  cpufreq_update_util() Steve Muckle <steve.muckle@linaro.org> - 2016-08-01 22:30 +0200
          Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-02 01:50 +0200
            Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to  cpufreq_update_util() Steve Muckle <steve.muckle@linaro.org> - 2016-08-02 04:10 +0200
  [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
    Re: [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in  cpufreq_update_util() Dominik Brodowski <linux@dominikbrodowski.net> - 2016-08-01 10:00 +0200
      Re: [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 17:10 +0200
      Re: [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in  cpufreq_update_util() Steve Muckle <steve.muckle@linaro.org> - 2016-08-01 21:50 +0200
        Re: [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-02 01:50 +0200
  [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
    Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access  utilization data directly Steve Muckle <steve.muckle@linaro.org> - 2016-08-01 21:40 +0200
      Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-02 02:10 +0200
        Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access  utilization data directly Juri Lelli <juri.lelli@arm.com> - 2016-08-02 12:40 +0200
          Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access  utilization data directly Steve Muckle <steve.muckle@linaro.org> - 2016-08-02 16:40 +0200
            Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access  utilization data directly Juri Lelli <juri.lelli@arm.com> - 2016-08-02 17:00 +0200
        Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access  utilization data directly Peter Zijlstra <peterz@infradead.org> - 2016-08-08 12:40 +0200
  [RFC][PATCH 2/7] cpufreq / sched: Drop cpufreq_trigger_update() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
  [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
    Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait  condition Steve Muckle <steve.muckle@linaro.org> - 2016-08-02 03:30 +0200
      Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rafael@kernel.org> - 2016-08-02 03:50 +0200
        Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait  condition Steve Muckle <steve.muckle@linaro.org> - 2016-08-03 00:30 +0200
          Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rafael@kernel.org> - 2016-08-03 00:50 +0200
            Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait  condition Steve Muckle <steve.muckle@linaro.org> - 2016-08-04 04:30 +0200
              Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-04 23:20 +0200
                Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait  condition Steve Muckle <steve.muckle@linaro.org> - 2016-08-05 00:10 +0200
                Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-06 23:20 +0200
  [RFC][PATCH 7/7] cpufreq: intel_pstate: Change P-state selection algorithm for Core "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
    RE: [RFC][PATCH 7/7] cpufreq: intel_pstate: Change P-state selection algorithm for Core "Doug Smythies" <dsmythies@telus.net> - 2016-08-04 09:00 +0200
      Re: [RFC][PATCH 7/7] cpufreq: intel_pstate: Change P-state selection algorithm for Core "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-06 23:50 +0200
        RE: [RFC][PATCH 7/7] cpufreq: intel_pstate: Change P-state selection algorithm for Core "Doug Smythies" <dsmythies@telus.net> - 2016-08-09 19:20 +0200
  [RFC][PATCH 6/7] cpufreq: schedutil: Add iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
    Re: [RFC][PATCH 6/7] cpufreq: schedutil: Add iowait boosting Steve Muckle <steve.muckle@linaro.org> - 2016-08-02 03:40 +0200
      Re: [RFC][PATCH 6/7] cpufreq: schedutil: Add iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-03 01:00 +0200
  RE: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting "Doug Smythies" <dsmythies@telus.net> - 2016-08-01 17:30 +0200
    Re: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 18:30 +0200
      Re: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags  and iowait boosting Peter Zijlstra <peterz@infradead.org> - 2016-08-08 13:10 +0200
        Re: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-08 15:00 +0200

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