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

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Date:	Thu, 4 Feb 2016 09:01:44 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Juri Lelli <juri.lelli@....com>,
	Steve Muckle <steve.muckle@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/3] cpufreq: Add a mechanism for registering utilization
 update callbacks

On 29-01-16, 23:53, 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 scheduler changes were suggested by Peter Zijlstra.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/cpufreq/cpufreq.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/cpufreq.h   |    7 +++++++
>  include/linux/sched.h     |    2 ++
>  kernel/sched/fair.c       |   29 ++++++++++++++++++++++++++++-
>  4 files changed, 81 insertions(+), 1 deletion(-)

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh