[PATCH v2 linux-next 0/2] cpufreq: cpufreq_driver_lock is hot on large systems

[Nathan Zimmer]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/