linux-kernel - Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce cpufreq_update

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Message-ID: <20160617164054.6339c5d4@xhacker>
Date:	Fri, 17 Jun 2016 16:40:54 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<rjw@...ysocki.net>, <viresh.kumar@...aro.org>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: regression caused by 08f511fd41c3 ("cpufreq: Reduce
 cpufreq_update_util() overhead a bit")

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