linux-kernel - Re: RFC: THE OFFLINE SCHEDULER

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Message-ID: <alpine.DEB.1.10.0908261136590.9933@gentwo.org>
Date:	Wed, 26 Aug 2009 11:41:51 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	raz ben yehuda <raziebe@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Mike Galbraith <efault@....de>, riel@...hat.com, mingo@...e.hu,
	andrew motron <akpm@...ux-foundation.org>,
	wiseman@...s.biu.ac.il, lkml <linux-kernel@...r.kernel.org>,
	linux-rt-users@...r.kernel.org
Subject: Re: RFC: THE OFFLINE SCHEDULER

On Wed, 26 Aug 2009, Peter Zijlstra wrote:

> Why waste a whole cpu for something that could be done by part of one?

Because of latency and performance requirements

> You're bound to have interaction between the core os and these
> partitions you want, non of it different from how threads in the kernel
> would interact, other than that you're going to re-invent everything
> already present in the kernel.

The kernel interactions can be done while running on another (not
isolated) cpu.

> You don't, you make things more complex by introducing duplicate
> functionality.

The functionality does not exist. This is about new features.

> If you think the kernel is too fat and does superfluous things for your
> needs, help trim it.

Mind boogling nonsense. Please stop fantasizing and trolling.



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