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

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To: "Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v2 15/45] rcu: Use get/put_online_cpus_atomic() to prevent CPU offline
From: Tejun Heo <tj@xxxxxxxxxx>
Date: Wed, 26 Jun 2013 14:34:58 -0700
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>, peterz@xxxxxxxxxxxxx, fweisbec@xxxxxxxxx, oleg@xxxxxxxxxx, walken@xxxxxxxxxx, mingo@xxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, vincent.guittot@xxxxxxxxxx, xiaoguangrong@xxxxxxxxxxxxxxxxxx, wangyun@xxxxxxxxxxxxxxxxxx, paulmck@xxxxxxxxxxxxxxxxxx, nikunj@xxxxxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, rusty@xxxxxxxxxxxxxxx, namhyung@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, laijs@xxxxxxxxxxxxxx, zhong@xxxxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, sbw@xxxxxxx, David Laight <David.Laight@xxxxxxxxxx>, akpm@xxxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx
In-reply-to: <51CB32E0.3040106@linux.vnet.ibm.com>
List-id: <linux-arch.vger.kernel.org>
User-agent: Mutt/1.5.21 (2010-09-15)

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
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