Date: Thu, 11 Apr 2013 09:10:31 -0700
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Christoph Lameter <cl@linux.com>, Ingo Molnar <mingo@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Chris Metcalf <cmetcalf@tilera.com>,
        Geoff Levand <geoff@infradead.org>,
        Gilad Ben Yossef <gilad@benyossef.com>,
        Hakan Akkan <hakanakkan@gmail.com>, Kevin Hilman <khilman@linaro.org>,
        Li Zhong <zhong@linux.vnet.ibm.com>,
        Namhyung Kim <namhyung.kim@lge.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 4/4] nohz: New option to force all CPUs in full dynticks
 range
Message-ID: <20130411161031.GA29861@linux.vnet.ibm.com>
Reply-To: paulmck@linux.vnet.ibm.com
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 <20130330091037.GA31743@gmail.com>
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On Thu, Apr 11, 2013 at 05:53:53PM +0200, Frederic Weisbecker wrote:
> On Thu, Apr 11, 2013 at 08:37:21AM -0700, Paul E. McKenney wrote:
> > On Thu, Apr 11, 2013 at 05:19:59PM +0200, Frederic Weisbecker wrote:
> > > On Mon, Apr 08, 2013 at 02:57:18PM +0000, Christoph Lameter wrote:
> > > > I think we could simplify things quite a bit if we either
> > > > 
> > > > 1. Add any cpus specified with nohz_full/extended=xxx to
> > > > rcu_nocb. No check is then necessary anymore.
> > > 
> > > Yeah in the long term we probably want that indeed.
> > 
> > Or just build with RCU_NOCB_CPU_ALL=y to unconditionally offload all
> > the CPUs when using nohz_extended.
> 
> If there is no performance issue with that I'm all for it.

We won't know until a bunch of people try it.  ;-)

							Thanx, Paul

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