Subject: Re: sysctls inside containers
From: Dave Hansen <haveblue@us.ibm.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, serue@us.ibm.com,
       frankeh@watson.ibm.com, clg@fr.ibm.com,
       Herbert Poetzl <herbert@13thfloor.at>, Sam Vilain <sam@vilain.net>
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Date: Mon, 06 Mar 2006 08:27:16 -0800
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On Sat, 2006-03-04 at 03:27 -0700, Eric W. Biederman wrote:
> > I don't see an immediately clear solution on how to containerize sysctls
> > properly.  The entire construct seems to be built around getting data
> > from in and out of global variables and into /proc files.
> 
> I successfully handled pid_max.  So while it is awkward you can get
> per task values in and out if sysctl. 

This:

http://www.kernel.org/git/gitweb.cgi?p=linux/kernel/git/ebiederm/linux-2.6-ns.git;a=commitdiff;h=1150082e0bae41a3621043b4c5ce15e9112884fa

sir, is a hack :)

We can't possibly do that for each and every sysctl variable.  It would
mean about fourteen billion duplicated _conv() functions. 

I'm wondering if, instead of having the .data field in that table, we
can have a function pointer which, when called, gives a pointer to the
data.  I'll give it a shot.

-- Dave

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