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

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Date:	Mon, 22 Feb 2016 16:15:34 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Juri Lelli <juri.lelli@....com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	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 19-02-16, 23:26, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Subject: [PATCH] cpufreq: Rework the scheduler hooks for triggering updates
> 
> Commit fe7034338ba0 (cpufreq: Add mechanism for registering
> utilization update callbacks) added cpufreq_update_util() to be
> called by the scheduler (from the CFS part) on utilization updates.
> The goal was to allow CFS to pass utilization information to cpufreq
> and to trigger it to evaluate the frequency/voltage configuration
> (P-state) of every CPU on a regular basis.
> 
> However, the last two arguments of that function are never used by
> the current code, so CFS might simply call cpufreq_trigger_update()
> instead of it.
> 
> For this reason, drop the last two arguments of cpufreq_update_util(),
> rename it to cpufreq_trigger_update() and modify CFS to call it.
> 
> Moreover, since the utilization is not involved in that now, rename
> data types, functions and variables related to cpufreq_trigger_update()
> to reflect that (eg. struct update_util_data becomes struct
> freq_update_hook and so on).
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/cpufreq/cpufreq.c          |   48 ++++++++++++++++++++++---------------
>  drivers/cpufreq/cpufreq_governor.c |   27 ++++++++++----------
>  drivers/cpufreq/cpufreq_governor.h |    2 -
>  drivers/cpufreq/intel_pstate.c     |   15 +++++------
>  include/linux/cpufreq.h            |   32 +++---------------------
>  kernel/sched/deadline.c            |    2 -
>  kernel/sched/fair.c                |   13 +---------
>  kernel/sched/rt.c                  |    2 -
>  8 files changed, 58 insertions(+), 83 deletions(-)

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

-- 
viresh