Subject: Re: [PATCH v2 15/45] rcu: Use get/put_online_cpus_atomic() to prevent CPU offline

From: Tejun Heo <[email-masked]>
Date: Wed, 26 Jun 2013 14:34:58 -0700

Hey,

On Wed, Jun 26, 2013 at 11:58:48PM +0530, Srivatsa S. Bhat wrote:
> Yes, we were discussing hot-unplug latency for use-cases such as
> suspend/resume. We didn't want to make those operations slower in the
> process of removing stop_machine() from hotplug.

Can you please explain why tho?  How much would it help in terms of
power-saving?  Or are there other issues in taking longer to shut down
cpus?

Thanks.

-- 
tejun