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

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Message-ID: <20061020135944.B8481@unix-os.sc.intel.com>
Date:	Fri, 20 Oct 2006 13:59:44 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Paul Jackson <pj@....com>
Cc:	Nick Piggin <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

On Fri, Oct 20, 2006 at 01:01:41PM -0700, Paul Jackson wrote:
> Nick wrote:
> > Or, another question, how does my patch hijack cpus_allowed? In
> > what way does it change the semantics of cpus_allowed?
> 
> It limits load balancing for tasks in cpusets containing
> a superset of that cpusets cpus.
> 
> There are always such cpusets - the top cpuset if no other.

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.

thanks,
suresh
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