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Date: Fri, 22 Feb 2002 11:14:04 -0800
From: Jesse Barnes <jbarnes@sgi.com>
To: Mike Kravetz <kravetz@us.ibm.com>
Cc: lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: [Lse-tech] NUMA scheduling
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On Fri, Feb 22, 2002 at 10:56:06AM -0800, Mike Kravetz wrote:
> Below is preliminary patch to implement some form of NUMA scheduling
> on top of Ingo's K3 scheduler patch for 2.4.17.  This is VERY early
> code and brings up some issues that need to be discussed/explored in
> more detail.  This patch was created to form a basis for discussion,
> rather than as a solution.  The patch was created for the i386 based
> NUMA system I have access to.  It will not work on other architectures.
> However, the only architecture specific code is a call to initialize
> some of the NUMA specific scheduling data structures.  Therefore, it
> should be trivial to port.

Ah, you beat me to it; I was working on code very similar to this when
I got your e-mail.  I think this sort of thing will address the
problem we've been seeing on machines with more than 16 cpus or so
(IDLE_REBALANCE_TICK is too small, flooding CPUs with load_balance
requests), as well as making numa scheduling a little more efficient.
I'll see if I can make it work on our platform and let you know how it
goes.

Jesse
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