linux-kernel - [PATCH 0/2] cpufreq: governor: Optimize work queuing in ondemand/conservative

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Message-ID: <5225538.XnBMjjCp2q@vostro.rjw.lan>
Date:	Fri, 12 Feb 2016 14:26:59 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Linux PM list <linux-pm@...r.kernel.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Juri Lelli <juri.lelli@....com>,
	Shilpasri G Bhat <shilpabhatppc@...il.com>
Subject: [PATCH 0/2] cpufreq: governor: Optimize work queuing in ondemand/conservative

Hi,

This is rather extreme, but I think that we should make the scheduler paths as
lightweight as reasonably possible.

[1/2] removes the atomic work counter incrementation from gov_cancel_work() as
      it is not necessary any more.

[2/2] changes the way work items are handled by dbs_update_util_handler() and
      dbs_work_handler() to avoid extra atomic operations in cases when they
      aren't really necessary (policy objects serving one CPU only).

On top of the pm-cpufreq-test branch of linux-pm.git.  Lightly tested, but
I don't have systems where policy objects are shared.

Thanks,
Rafael