linux-kernel - Re: [GIT PULL] nohz: Full dynticks base interface

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Message-ID: <20130324081701.GA13328@gmail.com>
Date:	Sun, 24 Mar 2013 09:17:01 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.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 E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [GIT PULL] nohz: Full dynticks base interface


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> Hi Ingo,
> 
> This settles the initial ground to start a special full dynticks tree in -tip
> that we can iterate incrementally to accelerate the development.
> It is based on tip:sched/core.
> 
> I tried to rearrange a bit the naming. We are probably not yet done with
> that but I guess we can fix it along with the rest.
> 
> Please pull from:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> 	full-dynticks-for-mingo
> 
> Changes on these commits since they were part of 3.9-rc1-nohz1:
> 
> * Force a timekeeping CPU over the full dynticks range
> * Rename CONFIG_NO_HZ_FULL to CONFIG_NO_HZ_EXTENDED
> * Following *_nohz_extended_* APIs renames
> * Handle CPU hotplug for timekeeping
> * Rename full_nohz= kernel parameter to nohz_extended=

Note that boot parameters suck for pretty much any purpose but quirks - 
please also add a (default off!) Kconfig option to easily enable 
nohz_extended for all CPUs.

That way I will be able to test it automatically via randconfig and such.

My next question/request after that would be: could we make sure that 
enabling this option does not break any applications or kernel 
functionality, ASAP? Once that is offered, it becomes pushable to v3.10 I 
think.

Meanwhile I have pulled your tree into tip:sched/nohz to stage and test 
it, in the hope that it becomes mergable quickly! :-)

Thanks,

	Ingo
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