linux-kernel - Re: [RFC] cpuset: add interface to isolated cpus

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Date:	Fri, 20 Oct 2006 18:33:24 -0700
From:	Paul Jackson <pj@....com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	nickpiggin@...oo.com.au, akpm@...l.org, mbligh@...gle.com,
	menage@...gle.com, Simon.Derr@...l.net,
	linux-kernel@...r.kernel.org, dino@...ibm.com,
	rohitseth@...gle.com, holt@....com, dipankar@...ibm.com,
	suresh.b.siddha@...el.com, clameter@....com
Subject: Re: [RFC] cpuset: add interface to isolated cpus

Suresh wrote:
> Its just a corner case issue that Nick didn't consider while doing a quick
> patch. Nick meant to partition the sched domain at the top
> exclusive cpuset and he probably missed the case where root cpuset is marked
> as exclusive.

This makes no sense.

If P is a partition of S, that means that P is a set of subsets of
S such that the intersection of any two members of P is empty, and
the union of the members of P equals S.

If P is a partition of S, then adding S itself to P as another member
makes P no longer a partion, for then every element of S is in two
elements of P, not one.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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