linux-kernel - Re: [RFC PATCH 10/15] nohz_task: Enter in extended quiescent state when in userspace

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Message-ID: <1292861920.5021.29.camel@laptop>
Date:	Mon, 20 Dec 2010 17:18:40 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	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 10/15] nohz_task: Enter in extended quiescent state
 when in userspace

On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
> (we check if the local cpu is in nohz mode, which means
> no other task compete on that CPU)

You keep repeating that definition, but its not true.. It means there is
not work for the tick to do, the tick does _tons_ more besides
preemption, so nr_running==1 is necessary but not sufficient. 
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