Subject: Re: 2.6 must-fix list, v2
From: Robert Love <rml@tech9.net>
To: Felipe Alfaro Solana <yo@felipe-alfaro.com>
Cc: "Shaheed R. Haque" <srhaque@iee.org>, Andrew Morton <akpm@digeo.com>,
       LKML <linux-kernel@vger.kernel.org>
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On Wed, 2003-05-14 at 07:02, Felipe Alfaro Solana wrote:

> > > > - Add ability to restrict the the default CPU affinity mask so that 
> > > >  sys_setaffinity() can be used to implement exclusive access to a CPU.
> > > 
> > > Why is this useful?
> > 
> > I forgot to add that the result is the rough equivalent of Digital UNIX's psets
> > and Irix's sysmp for my prurposes at least.
> 
> And psets and fencing in Solaris too...

You can get exclusive access with mangling the system call, simply by
having init  bind itself to the non-exclusive processors on boot.

Try it. Every task will then end up on only the non-exclusive
processors.  Seems a very simple change to me, and one that can be done
in user-space.

You do not even have to modify init, if you do not want.  Grab
http://tech9.net/rml/schedutils and put a taskset call in your rc.d

	Robert Love

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