linux-kernel - Re: config PROC

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Date:	Wed, 8 Jul 2015 15:50:34 +0100
From:	Djalal Harouni <tixxdz@...ndz.org>
To:	Iago López Galeiras <iago@...ocode.com>
Cc:	Jean Delvare <jdelvare@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Djalal Harouni <djalal@...ocode.com>,
	Alban Crequy <alban@...ocode.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: config PROC_CHILDREN

On Wed, Jul 08, 2015 at 04:18:28PM +0200, Iago López Galeiras wrote:
> On 07/04/2015 07:07 PM, Jean Delvare wrote:
> > Hi Iago,
> > 
> > Please don't top-post.
> > 
> > On Fri, 3 Jul 2015 11:10:45 +0200, Iago López Galeiras wrote:
> >> Hi Jean,
> >>
> >> The purpose of this option is enabling /proc/<pid>/task/<tid>/children without
> >> having to enable CHECKPOINT_RESTORE, which is hidden behind EXPERT.
> >>
> >> Regarding its lack of help, documentation is in already in place[1] but perhaps
> >> that's not clear for the user because as you say the Kconfig help text is missing.
> >>
> >> I suggest adding something like:
> >>
> >>     Provides a fast way to retrieve first level children pids of a task. See
> >>     <file:Documentation/filesystems/proc.txt> for more information.
> >>
> >> Do you think that's enough?
> > 
> > That's a start, the reference to Documentation/filesystems/proc.txt is
> > good but I think we can do better. You need to help the user make the
> > decision. Why should he/she say Y or N? The user should NOT have to look
> > at an external documentation file if the answer is N. I would suggest
> > the following:
> > 
> > Say Y if running any user-space software which takes benefit from this
> > interface. For example, rkt is such a piece of software.
> 
> That makes it more clear for the user. Thanks!
> 
> > That being said, I am curious... Is this interface so expensive that it
> > really deserves a separate option, instead of always enabling it? This
> > seems to be a fairly generic feature that a lot of scripts and tools
> > could benefit from (starting with pstree I suppose.)
> 
> I don't think I have enough information to answer that question. I'll CC Cyrill
> Gorcunov and Andrew Morton.
IIRC, this was suggested by Andrew Morton, and it results on this patch.

http://www.spinics.net/lists/linux-fsdevel/msg86491.html


> -- 
> 
> Iago López Galeiras
> Software developer @ Endocode AG
> iago@...ocode.com

-- 
Djalal Harouni
http://opendz.org
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