linux-kernel - Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code

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Date:	Wed, 7 Mar 2007 12:50:03 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	vatsa@...ibm.com
Cc:	akpm@...l.org, pj@....com, sekharan@...ibm.com, dev@...ru,
	xemul@...ru, serue@...ibm.com, ebiederm@...ssion.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	rohitseth@...gle.com, mbligh@...gle.com, winget@...gle.com,
	containers@...ts.osdl.org, devel@...nvz.org
Subject: Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code

On 3/7/07, Srivatsa Vaddagiri <vatsa@...ibm.com> wrote:
> If that is the case, I think we can push container_lock entirely inside
> cpuset.c and not have others exposed to this double-lock complexity.
> This is possible because cpuset.c (build on top of containers) still has
> cpuset->parent and walking cpuset->parent list safely can be made
> possible with a second lock which is local to only cpuset.c.
>

The callback mutex (which is what container_lock() actually locks) is
also used to synchronize fork/exit against subsystem additions, in the
event that some subsystem has registered fork or exit callbacks. We
could probably have a separate subsystem_mutex for that instead.

Apart from that, yes, it may well be possible to move callback lock
entirely inside cpusets.

Paul
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