linux-kernel - Re: RFC: THE OFFLINE SCHEDULER

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Message-ID: <84144f020908260916l34a21cai1abf7b2ca7ac93a3@mail.gmail.com>
Date:	Wed, 26 Aug 2009 19:16:12 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	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

Hi Peter,

On Wed, Aug 26, 2009 at 7:03 PM, Peter Zijlstra<peterz@...radead.org> wrote:
> There needs to be some communication between the isolated and non
> isolated part, otherwise what's the point. Even when you'd let it handle
> say a network device as pure firewall, you'd need to configure the
> thing, requiring interaction.

The use case Christoph described was an user-space number cruncher app
that does some network I/O over RDMA IIRC. AFAICT, if he could isolate
a physical CPU for the thing, there would be little or no
communication with the non-isolated part. Yes, the setup sounds weird
but it's a real workload although pretty damn specialized.

On Wed, Aug 26, 2009 at 7:03 PM, Peter Zijlstra<peterz@...radead.org> wrote:
>> > 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.
>
> Oh, to lay down the crack-pipe and sod off.

I guess I'll go for the magic mushrooms then.

                        Pekka
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