linux-kernel - Re: [PATCH 00/32] [RFC] nohz/cpuset: Start discussions on nohz CPUs

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Message-ID: <0000013ac1a58555-bea33420-d101-4e86-abc5-11dd6863b7a8-000000@email.amazonses.com>
Date:	Fri, 2 Nov 2012 15:03:01 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <clark.williams@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Li Zefan <lizf@...fujitsu.com>, Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 00/32] [RFC] nohz/cpuset: Start discussions on nohz
 CPUs

On Fri, 2 Nov 2012, Steven Rostedt wrote:

> > also it would be best to sync this conceptually with the processors
> > enabled for rcu processing.
>
> Processors can be disabled for rcu processing? Or are you talking about
> Paul's new work of offloading rcu callbacks?

Yes. Paul's new work to remove rcu processing from processors. That needs
to be synced configuration wise somehow. It does not make sense to process
rcu callbacks on processors where the timer tick does not work anymore.

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