linux-kernel - Re: [RFC] [PATCH 5/5] cgroups: subsystem dependencies

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Message-ID: <20091209010817.GA8929@andrew.cmu.edu>
Date:	Tue, 8 Dec 2009 20:08:18 -0500
From:	Ben Blum <bblum@...rew.cmu.edu>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, akpm@...ux-foundation.org,
	menage@...gle.com
Subject: Re: [RFC] [PATCH 5/5] cgroups: subsystem dependencies

On Tue, Dec 08, 2009 at 02:11:21PM +0800, Li Zefan wrote:
> > This patch adds a mechanism with which a subsystem can specify dependencies on
> > other subsystems. Since subsystems can come and go, it would not be useful to
> > refer to a depended-upon subsystem by subsys_id, so instead a NULL-terminated
> > array of strings must be specified. Validation is done by scanning for each
> > potential subsystem its list of subsystem names with strcmp at the end of
> > parse_cgroupfs_options.
> 
> I once posted a patch to implement this feature, but it was
> rejected by Andrew, because there was no user using it.
> 
> And still there is no user, right?

Dunno - Paul mentioned it might be useful in the future, so I threw this
together in an hour or so. Not entirely sure what he had in mind, but
this series can go with or without this particular patch.
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