Re: [PATCH 0/2] cpufreq: cpufreq_driver_lock is hot on large systems

[Rafael J. Wysocki]

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.
--
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/