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

[Mike Galbraith]

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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