linux-kernel - Re: [PATCH tip/core/rcu 0/2] v2 Add callback-free CPUs

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Date:	Wed, 31 Oct 2012 08:25:21 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...icios.com, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, sbw@....edu,
	patches@...aro.org, joe.korty@...r.com
Subject: Re: [PATCH tip/core/rcu 0/2] v2 Add callback-free CPUs

On Tue, 2012-10-30 at 20:45 -0700, Paul E. McKenney wrote:
> This commit therefore adds the ability
> for selected CPUs ("rcu_nocbs=" boot parameter) to have their
> callbacks
> offloaded to kthreads, inspired by Joe Korty's and Jim Houston's JRCU.
> If the "rcu_nocb_poll" boot parameter is also specified, these
> kthreads
> will do polling, removing the need for the offloaded CPUs to do
> wakeups. 

How much pain to make that dynamically configurable?
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