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Subject: Re: [PATCH]  Re: [RFC PATCH] namespaces: fix leak on fork() failure
From: Mike Galbraith <efault@gmx.de>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Oleg Nesterov <oleg@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Pavel Emelyanov <xemul@parallels.com>,
        Cyrill Gorcunov <gorcunov@openvz.org>,
        Louis Rilling <louis.rilling@kerlabs.com>
Date: Fri, 04 May 2012 11:45:16 +0200
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On Fri, 2012-05-04 at 00:55 -0700, Eric W. Biederman wrote:

> CLONE_NEWUSER?  I presume you have applied my latest user namespace
> patches?  Otherwise you are running completely half baked code.

I Removed CLONE_NEWUSER flag.

> hackbench?  Which kernel are you running.  Hackbench in some kernels is
> really good at triggering cache ping-pong effects with pids, and creds.

Not when pinned.  3.0 kernel without the debug stuff enabled in 3.4.git.
 
marge:/usr/local/tmp/starvation # taskset -c 3 ./hackbench
Running with 10*40 (== 400) tasks.
Time: 0.868
marge:/usr/local/tmp/starvation # taskset -c 3 ./hackbench -namespace
Running with 10*40 (== 400) tasks.
Time: 7.582
marge:/usr/local/tmp/starvation # taskset -c 3 ./hackbench -namespace -all
Running with 10*40 (== 400) tasks.
Time: 29.677

-Mike