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Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce cpufreq_update_util() overhead a bit")

From Jisheng Zhang <jszhang@marvell.com>
Newsgroups linux.kernel
Subject Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce cpufreq_update_util() overhead a bit")
Date 2016-06-17 10:50 +0200
Message-ID <rKXDs-4di-7@gated-at.bofh.it> (permalink)
References <rKXtL-49O-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Dear all,

On Fri, 17 Jun 2016 16:30:23 +0800 Jisheng Zhang wrote:

> Dear all,
> 
> I found one regression: In an idle system, wakeups/s (reported by powertop)
> is increased a lot, e.g on a intel snb 4 core platform, the wakeup event
> number is increased from 8 wakeups/s to 24 wakeup/s. bisect points to
> this commit. I could send detailed bisect log if it's wanted.
> 

more information maybe useful: after the commit, the top two wakeup source
are

        Process        [rcu_sched]

        Timer          tick_sched_timer

thanks

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regression caused by 08f511fd41c3 ("cpufreq: Reduce  cpufreq_update_util() overhead a bit") Jisheng Zhang <jszhang@marvell.com> - 2016-06-17 10:40 +0200
  Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce  cpufreq_update_util() overhead a bit") Jisheng Zhang <jszhang@marvell.com> - 2016-06-17 10:50 +0200
    Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce  cpufreq_update_util() overhead a bit") "Rafael J. Wysocki" <rafael@kernel.org> - 2016-06-17 15:10 +0200
      Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce  cpufreq_update_util() overhead a bit") "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-06-17 15:20 +0200
        Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce  cpufreq_update_util() overhead a bit") Peter Zijlstra <peterz@infradead.org> - 2016-06-17 16:10 +0200
          Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce  cpufreq_update_util() overhead a bit") "Rafael J. Wysocki" <rafael@kernel.org> - 2016-06-17 17:40 +0200
          RE: regression caused by bb6ab52f2bef ("intel_pstate: Do not set  utilization update hook too early") Jisheng Zhang <jszhang@marvell.com> - 2016-06-17 17:40 +0200
            Re: regression caused by bb6ab52f2bef ("intel_pstate: Do not set  utilization update hook too early") "Rafael J. Wysocki" <rafael@kernel.org> - 2016-06-17 17:50 +0200
              Re: regression caused by bb6ab52f2bef ("intel_pstate: Do not set  utilization update hook too early") "Rafael J. Wysocki" <rafael@kernel.org> - 2016-06-17 17:50 +0200
                RE: regression caused by bb6ab52f2bef ("intel_pstate: Do not set  utilization update hook too early") Jisheng Zhang <jszhang@marvell.com> - 2016-06-17 18:00 +0200
                RE: regression caused by bb6ab52f2bef ("intel_pstate: Do not set  utilization update hook too early") Jisheng Zhang <jszhang@marvell.com> - 2016-06-17 18:20 +0200
            RE: regression caused by bb6ab52f2bef ("intel_pstate: Do not set utilization update hook too early") "Doug Smythies" <dsmythies@telus.net> - 2016-06-23 18:20 +0200

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