From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>,
mingo@elte.hu, linux-kernel@vger.kernel.org,
vatsa@linux.vnet.ibm.com, bharata@linux.vnet.ibm.com,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
paulus <paulus@samba.org>
Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS
Date: Mon, 19 Dec 2011 16:09:49 +0000 [thread overview]
Message-ID: <20111219160949.61461ce7@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <1324309901.24621.14.camel@twins>
On Mon, 19 Dec 2011 16:51:41 +0100
Peter Zijlstra <peterz@infradead.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
next prev parent reply other threads:[~2011-12-19 16:10 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-19 8:33 Nikunj A. Dadhania
2011-12-19 8:34 ` [RFC PATCH 1/4] sched: Adding cpu.gang file to cpu cgroup Nikunj A. Dadhania
2011-12-19 8:34 ` [RFC PATCH 2/4] sched: Adding gang scheduling infrastrucure Nikunj A. Dadhania
2011-12-19 15:51 ` Peter Zijlstra
2011-12-19 16:51 ` Peter Zijlstra
2011-12-20 1:43 ` Nikunj A Dadhania
2011-12-20 1:39 ` Nikunj A Dadhania
2011-12-19 8:34 ` [RFC PATCH 3/4] sched: Gang using set_next_buddy Nikunj A. Dadhania
2011-12-19 8:35 ` [RFC PATCH 4/4] sched:Implement set_gang_buddy Nikunj A. Dadhania
2011-12-19 15:51 ` Peter Zijlstra
2011-12-20 1:43 ` Nikunj A Dadhania
2011-12-26 2:30 ` Nikunj A Dadhania
2011-12-19 11:23 ` [RFC PATCH 0/4] Gang scheduling in CFS Ingo Molnar
2011-12-19 11:44 ` Avi Kivity
2011-12-19 11:50 ` Nikunj A Dadhania
2011-12-19 11:59 ` Avi Kivity
2011-12-19 12:06 ` Nikunj A Dadhania
2011-12-19 12:50 ` Avi Kivity
2011-12-19 13:09 ` Nikunj A Dadhania
2011-12-19 11:45 ` Nikunj A Dadhania
2011-12-19 13:22 ` Nikunj A Dadhania
2011-12-19 16:28 ` Ingo Molnar
2011-12-21 10:39 ` Nikunj A Dadhania
2011-12-21 10:43 ` Avi Kivity
2011-12-23 3:20 ` Nikunj A Dadhania
2011-12-23 10:36 ` Ingo Molnar
2011-12-25 10:58 ` Avi Kivity
2011-12-25 15:45 ` Avi Kivity
2011-12-26 3:14 ` Nikunj A Dadhania
2011-12-26 9:05 ` Avi Kivity
2011-12-26 11:33 ` Nikunj A Dadhania
2011-12-26 11:41 ` Avi Kivity
2011-12-27 1:47 ` Nikunj A Dadhania
2011-12-27 9:15 ` Avi Kivity
2011-12-27 10:24 ` Nikunj A Dadhania
2011-12-27 3:15 ` Nikunj A Dadhania
2011-12-27 9:17 ` Avi Kivity
2011-12-27 9:44 ` Nikunj A Dadhania
2011-12-27 9:51 ` Avi Kivity
2011-12-27 10:10 ` Nikunj A Dadhania
2011-12-27 10:34 ` Avi Kivity
2011-12-27 10:43 ` Nikunj A Dadhania
2011-12-27 10:53 ` Avi Kivity
2011-12-30 9:51 ` Ingo Molnar
2011-12-30 10:10 ` Nikunj A Dadhania
2011-12-31 2:21 ` Nikunj A Dadhania
2012-01-02 4:20 ` Nikunj A Dadhania
2012-01-02 9:39 ` Avi Kivity
2012-01-02 10:22 ` Nikunj A Dadhania
2012-01-02 9:37 ` Avi Kivity
2012-01-02 10:30 ` Nikunj A Dadhania
2012-01-02 13:33 ` Avi Kivity
2012-01-04 10:52 ` Nikunj A Dadhania
2012-01-04 14:41 ` Avi Kivity
2012-01-04 14:56 ` Srivatsa Vaddagiri
2012-01-04 17:13 ` Avi Kivity
2012-01-05 6:57 ` Nikunj A Dadhania
2012-01-04 16:47 ` Rik van Riel
2012-01-04 17:16 ` Avi Kivity
2012-01-04 20:56 ` Rik van Riel
2012-01-04 21:31 ` Peter Zijlstra
2012-01-04 21:41 ` Avi Kivity
2012-01-05 9:10 ` Ingo Molnar
2012-02-20 8:08 ` Nikunj A Dadhania
2012-02-20 8:14 ` Ingo Molnar
2012-02-20 10:51 ` Peter Zijlstra
2012-02-20 11:53 ` Nikunj A Dadhania
2012-02-20 12:02 ` Srivatsa Vaddagiri
2012-02-20 12:14 ` Peter Zijlstra
2012-01-05 2:10 ` Nikunj A Dadhania
2011-12-19 15:51 ` Peter Zijlstra
2011-12-19 16:09 ` Alan Cox [this message]
2011-12-19 22:10 ` Benjamin Herrenschmidt
2011-12-20 1:56 ` Nikunj A Dadhania
2011-12-20 8:52 ` Jeremy Fitzhardinge
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