linux-kernel - Re: RFC: THE OFFLINE SCHEDULER

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Message-Id: <1251222993.7023.53.camel@marge.simson.net>
Date:	Tue, 25 Aug 2009 19:56:33 +0200
From:	Mike Galbraith <efault@....de>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	raz ben yehuda <raziebe@...il.com>, riel@...hat.com, mingo@...e.hu,
	peterz@...radead.org, 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 Tue, 2009-08-25 at 11:23 -0400, Christoph Lameter wrote:
> On Sun, 23 Aug 2009, Mike Galbraith wrote:
> 
> > The rest, I'll leave off replying to, we're kinda splitting hairs.  I
> > don't see a big generic benefit to OFFSCHED or ilk, others do.
> 
> No we are not splitting hairs. OFFSCHED takes the OS noise (interrupts,
> timers, RCU, cacheline stealing etc etc) out of certain processors. You
> cannot run an undisturbed piece of software on the OS right now.

I asked the questions I did out of pure curiosity, and that curiosity
has been satisfied.  It's not that I find it useless or whatnot (or that
my opinion matters to anyone but me;).  I personally find the concept of
injecting an RTOS into a general purpose OS with no isolation to be
alien.  Intriguing, but very very alien.

	-Mike

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