linux-kernel - Re: scheduler scalability - cgroups, cpusets and load-balancing

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Message-Id: <20080129145647.579b7d53.pj@sgi.com>
Date:	Tue, 29 Jan 2008 14:56:47 -0600
From:	Paul Jackson <pj@....com>
To:	"Gregory Haskins" <ghaskins@...ell.com>
Cc:	a.p.zijlstra@...llo.nl, mingo@...e.hu, dmitry.adamushko@...il.com,
	rostedt@...dmis.org, menage@...gle.com, rientjes@...gle.com,
	tong.n.li@...el.com, tglx@...utronix.de, akpm@...ux-foundation.org,
	dhaval@...ux.vnet.ibm.com, vatsa@...ux.vnet.ibm.com,
	sgrubb@...hat.com, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, nickpiggin@...oo.com.au
Subject: Re: scheduler scalability - cgroups, cpusets and load-balancing

Gregory wrote:
> By moving it into the root_domain structure, there is now an instance
> per (um, for lack of a better, more up to date word) "exclusive"
> cpuset.   That way, disparate cpusets will not bother each other with
> overload notifications, etc.

So the root_domain structure is meant to be the portions of the
sched_domains that are shared across all CPUs in that sched_domain ?

And the word 'cpuset', occurring in the above quote twice, should
be 'sched_domain', right ?  Surely these aren't cpuset's ;).

And 'exclusive cpuset' really means 'non-overlapping sched_domain' ?

Or am I still confused ?

I would like to get our concepts clear, and terms consistent.  That's
important for those others who would try to understand this.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.940.382.4214
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