linux-kernel - Re: [RFC PATCH 04/15] nohz_task: Stop the tick when the nohz task runs alone

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Date:	Tue, 21 Dec 2010 09:34:39 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 04/15] nohz_task: Stop the tick when the nohz task
 runs alone

On Tue, 2010-12-21 at 14:22 +0100, Frederic Weisbecker wrote:
> On Tue, Dec 21, 2010 at 08:35:58AM +0100, Peter Zijlstra wrote:

> > No, and that worries me, you don't even seem to know what the tick does
> > and yet you're working on stopping it.
> 
> Yeah, I've been focusing a lot on preemption and rcu because they seemed
> to be the trickiest part of the thing, and I in the meantime I just forgot
> the rest or tagged it too quickly as details to deal with later. And I
> finally forgot them :)
> 
> Bah it's a first take, it can only improve ;)

Exactly!

This is an RFC, a "release early, release often" approach. And you Cc'd
all the right people. This is not something I expect to make into 2.6.38
though ;-)

-- Steve


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