linux-kernel - Re: RFC: THE OFFLINE SCHEDULER

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Message-ID: <alpine.DEB.1.10.0908281441340.7317@gentwo.org>
Date:	Fri, 28 Aug 2009 14:43:34 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Chris Friesen <cfriesen@...tel.com>,
	raz ben yehuda <raziebe@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	peterz@...radead.org, maximlevitsky@...il.com, efault@....de,
	riel@...hat.com, wiseman@...s.biu.ac.il,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: RFC: THE OFFLINE SCHEDULER

On Thu, 27 Aug 2009, Thomas Gleixner wrote:

> You are creating a "one special case" operation mode which is not
> justified in my opinion. Let's look at the problem you want to solve:
>
>   Run exactly one thread on a dedicated CPU w/o any disturbance by the
>   scheduler tick.

Thats not the problem I want to solve. There are multiple events that
could disturb a process like timers firing, softirqs and hardirqs.

> You can move away anything else than the scheduler tick from a CPU
> today already w/o a single line of code change.

How do you remove the per processor kernel threads for allocators and
other kernel subsystems? What about IPI broadcasts?
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