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

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Date:	Wed, 9 Mar 2016 14:32:47 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"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


* 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,

	Ingo