linux-kernel - [PATCH v2 linux-next 0/2] cpufreq: cpufreq_driver

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Message-Id: <1360116290-23849-1-git-send-email-nzimmer@sgi.com>
Date:	Tue,  5 Feb 2013 20:04:48 -0600
From:	Nathan Zimmer <nzimmer@....com>
To:	viresh.kumar@...aro.org, rjw@...k.pl
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	cpufreq@...r.kernel.org, Nathan Zimmer <nzimmer@....com>
Subject: [PATCH v2 linux-next 0/2] cpufreq: cpufreq_driver_lock is hot on large systems 

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 significant 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.

v2: Rebase to linux-next

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 | 150 +++++++++++++++++++++++++---------------------
 1 file changed, 83 insertions(+), 67 deletions(-)

-- 
1.8.0.1

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