linux-kernel - Re: [PATCH 00/10] Containers(V10): Generic Process Containers

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Message-Id: <20070604123151.4db007a6.pj@sgi.com>
Date:	Mon, 4 Jun 2007 12:31:51 -0700
From:	Paul Jackson <pj@....com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	menage@...gle.com, akpm@...ux-foundation.org, dev@...ru,
	xemul@...ru, serue@...ibm.com, vatsa@...ibm.com,
	ebiederm@...ssion.com, haveblue@...ibm.com,
	svaidy@...ux.vnet.ibm.com, balbir@...ibm.com, cpw@....com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org, mbligh@...gle.com, rohitseth@...gle.com,
	devel@...nvz.org
Subject: Re: [PATCH 00/10] Containers(V10): Generic Process Containers

What you describe, Serge, sounds like semantics carried over from cpusets.

Serge wrote:
> A task can't join a cpuset unless 'cpus' and 'mems' are set.

Yup - don't want to run a task in a cpuset that lacks cpu, or lacks
memory.  Hard to run without those.

> These don't seem to automatically inherit the parent's values

Yup - early in the life of cpusets, a created cpuset inherited the cpus
and mems of its parent.  But that broke the exclusive property big
time.  You will recall that a cpu_exclusive or mem_exclusive cpuset
cannot overlap the cpus or memory, respectively, of any of its sibling
cpusets.

So we changed it to creating new cpusets empty of cpus or memory.

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