From: Matthew Dobson <colpatch@us.ibm.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Erich Focht <efocht@hpce.nec.com>,
LSE Tech <lse-tech@lists.sourceforge.net>,
Paul Jackson <pj@sgi.com>, "Martin J. Bligh" <mbligh@aracnet.com>,
Andrew Morton <akpm@osdl.org>,
ckrm-tech@lists.sourceforge.net,
LKML <linux-kernel@vger.kernel.org>,
simon.derr@bull.net, frankeh@watson.ibm.com
Subject: Re: [Lse-tech] [RFC PATCH] scheduler: Dynamic sched_domains
Date: Fri, 08 Oct 2004 11:54:52 -0700 [thread overview]
Message-ID: <1097261691.5650.23.camel@arrakis> (raw)
In-Reply-To: <41666E90.2000208@yahoo.com.au>
On Fri, 2004-10-08 at 03:40, Nick Piggin wrote:
> And so you want to make a partition with CPUs {0,1,2,4,5}, and {3,6,7}
> for some crazy reason, the new domains would look like this:
>
> 0 1 2 4 5 3 6 7
> --- - --- - --- <- 0
> | | | | |
> ----- - - - <- 1
> | | | |
> ------- ----- <- 2 (global, partitioned)
>
> Agreed? You don't need to get fancier than that, do you?
>
> Then how to input the partitions... you could have a sysfs entry that
> takes the complete partition info in the form:
>
> 0,1,2,3 4,5,6 7,8 ...
>
> Pretty dumb and simple.
How do we describe the levels other than the first? We'd either need
to:
1) come up with a language to describe the full tree. For your example
I quoted above:
echo "0,1,2,4,5 3,6 7,8;0,1,2 4,5 3 6,7;0,1 2 4,5 3 6,7" > partitions
2) have multiple files:
echo "0,1,2,4,5 3,6,7" > level2
echo "0,1,2 4,5 3 6,7" > level1
echo "0,1 2 4,5 3 6,7" > level0
3) Or do it hierarchically as Paul implemented in cpusets, and as I
described in an earlier mail:
mkdir level2
echo "0,1,2,4,5 3,6,7" > level2/partitions
mkdir level1
echo "0,1,2 4,5 3 6,7" > level1/partitions
mkdir level0
echo "0,1 2 4,5 3 6,7" > level0/partitions
I personally like the hierarchical idea. Machine topologies tend to
look tree-like, and every useful sched_domain layout I've ever seen has
been tree-like. I think our interface should match that.
-Matt
next prev parent reply other threads:[~2004-10-08 19:01 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-07 0:51 [RFC PATCH] scheduler: Dynamic sched_domains Matthew Dobson
2004-10-07 2:13 ` Nick Piggin
2004-10-07 17:01 ` Jesse Barnes
2004-10-08 5:55 ` [Lse-tech] " Takayoshi Kochi
2004-10-08 6:08 ` Nick Piggin
2004-10-08 16:43 ` Jesse Barnes
2004-10-07 21:58 ` Matthew Dobson
2004-10-08 0:22 ` Nick Piggin
2004-10-07 22:20 ` Matthew Dobson
2004-10-07 4:12 ` [ckrm-tech] " Marc E. Fiuczynski
2004-10-07 5:35 ` Paul Jackson
2004-10-07 22:06 ` Matthew Dobson
2004-10-07 9:32 ` Paul Jackson
2004-10-08 10:14 ` [Lse-tech] " Erich Focht
2004-10-08 10:40 ` Nick Piggin
2004-10-08 15:50 ` [ckrm-tech] " Hubertus Franke
2004-10-08 22:48 ` Matthew Dobson
2004-10-08 18:54 ` Matthew Dobson [this message]
2004-10-08 21:56 ` Peter Williams
2004-10-08 22:52 ` Matthew Dobson
2004-10-08 23:13 ` Erich Focht
2004-10-08 23:50 ` Nick Piggin
2004-10-10 12:25 ` Erich Focht
2004-10-08 22:51 ` Erich Focht
2004-10-09 1:05 ` Matthew Dobson
2004-10-10 12:45 ` Erich Focht
2004-10-12 22:45 ` Matthew Dobson
2004-10-08 18:45 ` Matthew Dobson
2005-04-18 20:26 ` [RFC PATCH] Dynamic sched domains aka Isolated cpusets Dinakar Guniguntala
2005-04-18 23:44 ` Nick Piggin
2005-04-19 8:00 ` Dinakar Guniguntala
2005-04-19 5:54 ` Paul Jackson
2005-04-19 6:19 ` Nick Piggin
2005-04-19 6:59 ` Paul Jackson
2005-04-19 7:09 ` Nick Piggin
2005-04-19 7:25 ` Paul Jackson
2005-04-19 7:28 ` Paul Jackson
2005-04-19 7:19 ` Paul Jackson
2005-04-19 7:57 ` Nick Piggin
2005-04-19 20:34 ` Paul Jackson
2005-04-23 23:26 ` Paul Jackson
2005-04-26 0:52 ` Matthew Dobson
2005-04-26 0:59 ` Paul Jackson
2005-04-19 9:52 ` Dinakar Guniguntala
2005-04-19 15:26 ` Paul Jackson
2005-04-20 7:37 ` Dinakar Guniguntala
2005-04-19 20:42 ` Paul Jackson
2005-04-19 8:12 ` Simon Derr
2005-04-19 16:19 ` Paul Jackson
2005-04-19 9:34 ` [Lse-tech] " Dinakar Guniguntala
2005-04-19 17:23 ` Paul Jackson
2005-04-20 7:16 ` Dinakar Guniguntala
2005-04-20 19:09 ` Paul Jackson
2005-04-21 16:27 ` Dinakar Guniguntala
2005-04-22 21:26 ` Paul Jackson
2005-04-23 7:24 ` Dinakar Guniguntala
2005-04-23 22:30 ` Paul Jackson
2005-04-25 11:53 ` Dinakar Guniguntala
2005-04-25 14:38 ` Paul Jackson
2005-04-21 17:31 ` [RFC PATCH] Dynamic sched domains aka Isolated cpusets (v0.2) Dinakar Guniguntala
2005-04-22 18:50 ` Paul Jackson
2005-04-22 21:37 ` Paul Jackson
2005-04-23 3:11 ` Paul Jackson
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