linux-kernel - Re: [rfc 2/3] fs, proc: Introduce the Children: line in /proc/<pid>/status

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Date:	Fri, 2 Dec 2011 14:25:44 +0000
From:	Pedro Alves <pedro@...esourcery.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: [rfc 2/3] fs, proc: Introduce the Children: line in /proc/<pid>/status

On Friday 02 December 2011 14:17:08, Pavel Emelyanov wrote:

> O_O   OK, I was wrong, they do live there. But I consider this as bug.

You can't change that.  It'd break current gdb at least.

> Anyway -- my concern about unneeded memory overhead still stands.
> Even a simple find /proc will result in smth like
> 
> /proc/1
> /proc/1/children/2
> /proc/1/children/2/children/4
> /proc/1/children/2/children/4
> /proc/1/children/3
> /proc/1/children/3/children/5
> /proc/2
> /proc/2/children/4
> /proc/3
> /proc/3/children/5
> /proc/4
> /proc/5
> 
> Instead of
> 
> /proc/1
> /proc/2
> /proc/3
> /proc/4
> /proc/5
> 
> I.e. each task will be shown multiple times, which is not very fun, but memory exhaustive from my POV.

Now that is a good argument against hard linking.  But not if you make
the entries under children/ symlinks.  Then find doesn't recurse.  And
then 

$ find -L /proc/PID/

does recurse and give you the whole tree.  Which I'd say is
actually useful...

-- 
Pedro Alves
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