On Friday, February 22, 2013 10:24:33 AM Nathan Zimmer wrote:I am noticing the cpufreq_driver_lock is quite hot.I'm going to take patch [1/2] for v3.10, but patch [2/2] still needs some
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
v3: Read the RCU documentation instead of skimming it. Also I based on
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git pm+acpi-3.9-rc1
I assumed that was what you would prefer Rafael.
v4: Removed an unnecessary syncronize_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 | 286 ++++++++++++++++++++++++++++++++++------------
1 file changed, 211 insertions(+), 75 deletions(-)
work it seems. Is that correct? If so, are you going to send an update?
Rafael