linux-kernel - Re: [PATCH 4/4] nohz: New option to force all CPUs in full dynticks range

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Message-ID: <20130411161031.GA29861@linux.vnet.ibm.com>
Date:	Thu, 11 Apr 2013 09:10:31 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Christoph Lameter <cl@...ux.com>, Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 4/4] nohz: New option to force all CPUs in full dynticks
 range

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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