linux-kernel - Re: [PATCH 0/2] cpufreq: cpufreq_driver

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Date:	Tue, 05 Feb 2013 02:07:18 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Nathan Zimmer <nzimmer@....com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	cpufreq@...r.kernel.org, Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH 0/2] cpufreq: cpufreq_driver_lock is hot on large systems

On Monday, February 04, 2013 04:45:11 PM Nathan Zimmer wrote:
> I am noticing the cpufreq_driver_lock is quite hot.
> On an idle 512 system perf shows me most of the system time is spent on this
> lock.  This is quite signifigant as top shows 5% of time in system time.
> My solution was to first convert the lock to a rwlock and then to the rcu.
> 
> 
> Nathan Zimmer (2):
>   cpufreq: Convert the cpufreq_driver_lock to a rwlock
>   cpufreq: Convert the cpufreq_driver_lock to use the rcu
> 
>  drivers/cpufreq/cpufreq.c | 139 ++++++++++++++++++++++++++--------------------
>  1 file changed, 79 insertions(+), 60 deletions(-)

I like these changes.

Viresh, anyone, any comments?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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