linux-kernel - Re: [PATCH]: proc: export a processes resource limits via proc/<pid>

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Message-ID: <21194.1187382045@turing-police.cc.vt.edu>
Date:	Fri, 17 Aug 2007 16:20:45 -0400
From:	Valdis.Kletnieks@...edu
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Neil Horman <nhorman@...driver.com>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH]: proc: export a processes resource limits via proc/<pid>

On Fri, 17 Aug 2007 12:45:47 PDT, Andrew Morton said:
> On Fri, 17 Aug 2007 06:59:18 -0400
> Neil Horman <nhorman@...driver.com> wrote:
> 
> > Currently, there exists no method for a process to query the resource
> > limits of another process.  They can be inferred via some mechanisms but they
> > cannot be explicitly determined.  Given that this information can be usefull to
> > know during the debugging of an application, I've written this patch which
> > exports all of a processes limits via /proc/<pid>/limits.
> 
> I'm struggling with this a bit.  Sure, it _might_ be handy on some
> occasions to be able to get at this information.  But I've never seen
> anyone ask for it before, and it _is_ determinable by other means, if only
> strace.

Most of the times *I*'ve struggled with this, it's been a case of "this program
forks that one that calls a PAM module that does this and then double-forks
yadda yadda".  So I know where Neil is coming from.

> How do we justify adding yet more stuff to the kernel?

I looked the code over, and *if* we want to do it, the code looks good.
Making that final call is why they pay you and Linus the big bucks. :)


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