linux-kernel - Re: [PATCH v10 1/3] cpufreq: Add mechanism for registering utilization update callbacks

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Message-ID: <CAJZ5v0jyHAEsNUd=B9SFWFv44V1H=wi9kcY8tm4Xq4k2ssbaCg@mail.gmail.com>
Date:	Wed, 9 Mar 2016 14:39:43 +0100
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Juri Lelli <juri.lelli@....com>,
	Steve Muckle <steve.muckle@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v10 1/3] cpufreq: Add mechanism for registering
 utilization update callbacks

On Wed, Mar 9, 2016 at 2:32 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Peter Zijlstra <peterz@...radead.org> wrote:
>
>> On Mon, Feb 15, 2016 at 10:47:22PM +0100, Rafael J. Wysocki wrote:
>> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> >
>> > Introduce a mechanism by which parts of the cpufreq subsystem
>> > ("setpolicy" drivers or the core) can register callbacks to be
>> > executed from cpufreq_update_util() which is invoked by the
>> > scheduler's update_load_avg() on CPU utilization changes.
>> >
>> > This allows the "setpolicy" drivers to dispense with their timers
>> > and do all of the computations they need and frequency/voltage
>> > adjustments in the update_load_avg() code path, among other things.
>> >
>> > The update_load_avg() changes were suggested by Peter Zijlstra.
>> >
>> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> > Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
>> > ---
>> >  drivers/cpufreq/cpufreq.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
>> >  include/linux/cpufreq.h   |   34 ++++++++++++++++++++++++++++++++++
>> >  kernel/sched/deadline.c   |    4 ++++
>> >  kernel/sched/fair.c       |   26 +++++++++++++++++++++++++-
>> >  kernel/sched/rt.c         |    4 ++++
>> >  kernel/sched/sched.h      |    1 +
>> >  6 files changed, 113 insertions(+), 1 deletion(-)
>> >
>>
>> So with the understanding that we'll work on getting rid of
>> cpufreq_trigger_update().
>>
>> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
>
> I'm happy with the latest iteration and with the general direction as well!
>
> Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks a lot!

Rafael