linux-kernel - Re: regression caused by bb6ab52f2bef ("intel_pstate: Do not set utilization update hook too early")

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Message-ID: <CAJZ5v0j5Jdi-JtEXKT-K7GFp+QHPqWgKJ1SmwS6XgEp4=axJkg@mail.gmail.com>
Date:	Sat, 25 Jun 2016 02:03:37 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Doug Smythies <dsmythies@...us.net>
Cc:	Jisheng Zhang <jszhang@...vell.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: regression caused by bb6ab52f2bef ("intel_pstate: Do not set
 utilization update hook too early")

On Thu, Jun 23, 2016 at 6:07 PM, Doug Smythies <dsmythies@...us.net> wrote:
> On 2016.06.17 08:32 Jisheng Zhang wrote:
>
>> Second, sorry again for report incorrect commit,
>> I were too tired this morning so I remember the wrong commit.
>> The regression is caused by bb6ab52f2bef ("intel_pstate: Do not
>> set utilization update hook too early"), so I update the email title.
>
> Summary:
>
> Isn't running powertop itself a significant contributor here?

It shouldn't be, because the overhead in question comes from
->setpolicy and powertop itself should not cause it to be invoked that
often.

Thanks,
Rafael