linux-kernel - Re: [PATCH] Re: [RFC PATCH] namespaces: fix leak on fork() failure

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Message-ID: <1336105676.7356.42.camel@marge.simpson.net>
Date:	Fri, 04 May 2012 06:27:56 +0200
From:	Mike Galbraith <efault@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Louis Rilling <louis.rilling@...labs.com>
Subject: Re: [PATCH]  Re: [RFC PATCH] namespaces: fix leak on fork() failure

Namespaces have something in common with cgroups.  synchronize_rcu()
makes them somewhat less than wonderful for dynamic use.

default flags = SIGCHLD

-namespace:  flag |= CLONE_NEWPID 
-all:  flags |= CLONE_NEWIPC | CLONE_NEWNET | CLONE_NEWUSER

marge:/usr/local/tmp/starvation # ./hackbench
Running with 10*40 (== 400) tasks.
Time: 2.636
marge:/usr/local/tmp/starvation # ./hackbench -namespace
Running with 10*40 (== 400) tasks.
Time: 11.624
marge:/usr/local/tmp/starvation # ./hackbench -namespace -all
Running with 10*40 (== 400) tasks.
Time: 51.474

You can create trash quickly, but you have to haul it away.

-Mike

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