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

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Message-ID: <1292859744.5021.4.camel@laptop>
Date:	Mon, 20 Dec 2010 16:42:24 +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 Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
> This implements the /proc/pid/nohz file that enables the
> nohz attribute of a task.
> 
> Synchronization is enforced so that:
> 
> - A CPU can have only one nohz task

Why?

> - A nohz task can be only affine to a single CPU

Why?

> For now this is only possible to write on /proc/self but probably
> allowing it from another task would be a good idea and wouldn't
> increase so much the complexity of the code. 

ptrace rules might match that.
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