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

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Message-ID: <20130411170420.GA17129@somewhere.redhat.com>
Date:	Thu, 11 Apr 2013 19:04:23 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Lameter <cl@...ux.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	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 04:41:07PM +0000, Christoph Lameter wrote:
> On Thu, 11 Apr 2013, Frederic Weisbecker wrote:
> 
> > If there is no performance issue with that I'm all for it.
> 
> Or have a
> 
> CONFIG_LOWLATENCY
> 
> that boots up a kernel with the proper configuration?

It may be too general for a naming. But I don't mind just
selecting CONFIG_RCU_NOCBS_ALL unconditionally. It's easily
changed in the future if anybody complains.

Btw, if CONFIG_RCU_NOCBS_ALL is set, the rcu_nocbs= parameter
is ignored, right? If you want to keep that direction and not
override the Kconfig choice, may be warn the user about that
if the boot parameter is passed?

Thanks.

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