linux-kernel - Re: [PATCH 3/3 v5] cpufreq: governor: Replace timers with utilization update callbacks

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Message-ID: <20160207153630.GE3808@vireshk>
Date:	Sun, 7 Feb 2016 21:06:30 +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 3/3 v5] cpufreq: governor: Replace timers with
 utilization update callbacks

On 07-02-16, 15:50, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Instead of using a per-CPU deferrable timer for queuing up governor
> work items, register a utilization update callback that will be
> invoked from the scheduler on utilization changes.
> 
> The sampling rate is still the same as what was used for the
> deferrable timers and the added irq_work overhead should be offset by
> the eliminated timers overhead, so in theory the functional impact of
> this patch should not be significant.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
> 
> Changes from v4:
> - Moved init_irq_work() to alloc_common_dbs_info() so it is done along with
>   the INIT_WORK() on the main work structure (which seems more logical to me).
> - Added the ACK from Viresh (in the hope that it still applied).

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

-- 
viresh