linux-kernel - Re: [RFC PATCH 06/15] nohz_task: Keep the tick if rcu needs it

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Message-ID: <20101220171259.1d3cb6ad@bike.lwn.net>
Date:	Mon, 20 Dec 2010 17:12:59 -0700
From:	Jonathan Corbet <corbet@....net>
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>,
	Steven Rostedt <rostedt@...dmis.org>,
	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 06/15] nohz_task: Keep the tick if rcu needs it

On Tue, 21 Dec 2010 00:49:38 +0100
Frederic Weisbecker <fweisbec@...il.com> wrote:

> Nope, the new config can only be built after [RFC PATCH 11/15] x86: Nohz task support
> 
> I know I split up the patches in some unusual way but I did that on purpose:
> I wanted to have a finegrained patchset so that it's more reviewable than a big
> "core support" - "arch support" dual patch based style.
> 
> But I ensured the new config can not be enabled before it's entirely buildable
> and has no known bugs.

Which is a nice thought (it helped me to understand the patches - article
forthcoming), but there is a downside: if anybody tries to bisect a
problem, they'll end up at #11.  This stuff is sufficiently tricky that it
would be nice to be able to bisect a little closer to the patch which
actually introduced a bug.

jon
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