linux-kernel - Re: [RFC PATCH 15/15] nohz

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Date:	Tue, 21 Dec 2010 09:14:40 +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 15/15] nohz_task: Procfs interface

On Tue, 2010-12-21 at 02:24 +0100, Frederic Weisbecker wrote:
> 
> > Also, I'm not quite happy with the pure userspace restriction, but at
> > least I see why you did that event though you didn't mention that.
> 
> What do you mean? The fact that kernel threads can not be nohz task? 

No, that you key off kernel/user boundary transitions. Arguably one
could allow simply system calls and page-faults to happen without
restarting the tick, then again, RCU is very pervasive these days so I'm
not quite sure you can actually make that happen.


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