linux-kernel - Re: [RFC PATCH 0/4] Gang scheduling in CFS

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Date:	Mon, 19 Dec 2011 16:09:49 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>, mingo@...e.hu,
	linux-kernel@...r.kernel.org, vatsa@...ux.vnet.ibm.com,
	bharata@...ux.vnet.ibm.com,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	paulus <paulus@...ba.org>
Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS

On Mon, 19 Dec 2011 16:51:41 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> On Mon, 2011-12-19 at 14:03 +0530, Nikunj A. Dadhania wrote:
> > The following patches implements gang scheduling. These patches
> >     are *highly* experimental in nature and are not proposed for
> >     inclusion at this time.
> 
> Nor will they ever be, I've always strongly opposed the whole concept
> and I'm not about to change my mind. Gang scheduling is a scalability
> nightmare. 

For most situations: I think the question is whether you can write a
clean gang scheduling option which has no impact on "normal" users. 

Yes gang scheduling is insane but for some insane workloads its the right
thing to do.

Alan
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