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

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Message-ID: <1292861799.5021.27.camel@laptop>
Date:	Mon, 20 Dec 2010 17:16:39 +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 16:57 +0100, Frederic Weisbecker wrote:

> Should I?

Well yes, this interface of explicitly marking a task and cpu as
task_no_hz is kinda restrictive and useless.

When I run 4 cpu-bound tasks on a quad-core I shouldn't have to do
anything to benefit from this.

I don't see why having this cpumask is restricting you in any way,
user-space tasks don't migrate around, that all happens in kernel space.

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.
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