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Date: Wed, 31 Oct 2012 00:44:02 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Peter Zijlstra <peterz@...radead.org> 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 Wed, Oct 31, 2012 at 08:25:21AM +0100, Peter Zijlstra wrote: > 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? A fair amount of pain, though I do hope to make it runtime configurable at some point. Known problems include races between changes in the nocb configuration, rcu_barrier(), grace-period initialization, and CPU hotplug. Should be solvable, but want to get the other bugs out of the way first. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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