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SubjectRe: [PATCH] cpu_pm: replace raw_notifier to atomic_notifier

On 07/07/2017 06:25 PM, Sebastian Andrzej Siewior wrote:
> On 2017-07-06 16:47:46 [+0800], Alex Shi wrote:
>> This patch replace a rwlock and raw notifier by atomic notifier which
> + is
>> protected by spin_lock and rcu.
> …
>> Sebastian suggested using atomic_notifier instead of rwlock, which is not
>> only removing the sleeping in idle, but also getting better latency
>> improvement.
> Did you measure this / have numbers or did you write this because this
> is what RCU does in general?

Uh, I have no number on the performance. The benefit is in the theory.
But above article give some comparison data of rwlock and RCU.

> Acked-by: Sebastian Andrzej Siewior <>

Thanks a lot!


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