linux-kernel - Re: [ckrm-tech] [PATCH 3/6] containers: Add generic multi-subsystem API to containers

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Date:	Wed, 10 Jan 2007 21:26:21 +0530
From:	Balbir Singh <balbir@...ibm.com>
To:	Paul Menage <menage@...gle.com>
CC:	akpm@...l.org, pj@....com, sekharan@...ibm.com, dev@...ru,
	xemul@...ru, serue@...ibm.com, vatsa@...ibm.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: [ckrm-tech] [PATCH 3/6] containers: Add generic multi-subsystem
 API	to containers

Paul Menage wrote:
> +/* The set of hierarchies in use. Hierarchy 0 is the "dummy
> + * container", reserved for the subsystems that are otherwise
> + * unattached - it never has more than a single container, and all
> + * tasks are part of that container. */
> +
> +static struct containerfs_root rootnode[CONFIG_MAX_CONTAINER_HIERARCHIES];
> +
> +/* dummytop is a shorthand for the dummy hierarchy's top container */
> +#define dummytop (&rootnode[0].top_container)
> +

With these changes, is there a generic way to determine the root container
for the hierarchy the subsystem is in? Calls to ->create() pass the dummytop
container. It would be useful and is often required to walk the hierarchy
and know the root of the container hierarchy.

-- 
	Thanks,
	Balbir Singh,
	Linux Technology Center,
	IBM Software Labs
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