linux-kernel - Re: [patch 1/4] fs, proc: Introduce /proc/<pid>/task/<tid>/children entry v8

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Message-ID: <20120125152958.GA7888@moon>
Date:	Wed, 25 Jan 2012 19:29:58 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [patch 1/4] fs, proc: Introduce /proc/<pid>/task/<tid>/children
 entry v8

On Wed, Jan 25, 2012 at 10:55:51AM +0400, Cyrill Gorcunov wrote:
> > 
> > Now that you have reminded me of this thread.  I can say that the
> > link would need to look like ../../pid.  Our children will always
> > be thread group leaders, so we can safely point to the /proc/<pid>
> > directories.  So readlink would return ../../<pid> or however many
> > dots are needed.  Follow link could just warp us to that directory
> > as it does for the other magic proc symlinks.
> > 
> > My feeling is that a children subdirectory would be a lot more useful
> > than a simple file that lists the children.
> > 
> 
> I'll check what I can do, thanks.
> 

Sigh. This will require complete code rewrite. And since I've just
made it to live under CONFIG_CHECKPOINT_RESTORE I would prefer if
we stick with children file. So if there are no strong objections
agains 'children' as a file, could we leave it as is, ie in
stream-of-pids form?

	Cyrill
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