linux-kernel - Re: [PATCH v2 15/45] rcu: Use get/put_online_cpus

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Message-ID: <20130626213458.GC4536@htj.dyndns.org>
Date:	Wed, 26 Jun 2013 14:34:58 -0700
From:	Tejun Heo <tj@...nel.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, peterz@...radead.org,
	fweisbec@...il.com, oleg@...hat.com, walken@...gle.com,
	mingo@...nel.org, linux-arch@...r.kernel.org,
	vincent.guittot@...aro.org, xiaoguangrong@...ux.vnet.ibm.com,
	wangyun@...ux.vnet.ibm.com, paulmck@...ux.vnet.ibm.com,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	rusty@...tcorp.com.au, namhyung@...nel.org, tglx@...utronix.de,
	laijs@...fujitsu.com, zhong@...ux.vnet.ibm.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, sbw@....edu,
	David Laight <David.Laight@...LAB.COM>,
	akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 15/45] rcu: Use get/put_online_cpus_atomic() to
 prevent CPU offline

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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