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

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Message-ID: <4539BAB2.3010501@yahoo.com.au>
Date:	Sat, 21 Oct 2006 16:14:10 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Paul Jackson <pj@....com>
CC:	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

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.

Ah OK, and there is my misunderstanding with cpusets. From the
documentation it appears as though cpu_exclusive cpusets are
made in order to do the partitioning thing.

If you always have other domains overlapping them (regardless
that it is a parent), then what actual use does cpu_exclusive
flag have?

-- 
SUSE Labs, Novell Inc.
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