linux-kernel - Re: [RFC PATCH 00/15] Nohz task support

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Message-ID: <20101221015311.GO1715@nowhere>
Date:	Tue, 21 Dec 2010 02:53:13 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	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 00/15] Nohz task support

On Mon, Dec 20, 2010 at 05:35:51PM +0100, Peter Zijlstra wrote:
> On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
> > Any comments are welcome.
> 
> Not a single patch touches any of the accounting work done by the tick,
> current NO_HZ more is _barely_ sufficient for the nr_running==0 case, it
> definitely needs work for nr_running==1.

I'm not sure what you mean. Is it about timekeeping? Note we keep a cpu to
handle that. Hmm that makes me think, if it goes idle we may be screwed...
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