Re: [PATCH 7/7] uts namespaces: Implement CLONE_NEWUTS flag

[Andi Kleen <ak@suse.de>]

> But, either the nsproxy is shared between tasks and you need to copy
> youself a new one as soon as any ns changes

That would be the case. But it is only shared between tasks where 
all the name spaces are the same.

> , or it is not shared, and 
> you don't need  that info at all (just make the change in the nsproxy
> immediately)

Don't follow you here.

Basically the goal is to have a minimum number of nsproxies in the system without
having to maintain a global hash table. So instead you assume that name space
changes are infrequent. In the common case of clone without a name space change
you just share the nsproxy of the parent. If there is a name space change of
any kind you get a new one.

This won't get the absolute minimum number of nsproxies, but should be reasonably
good without too much effort.

-Andi

> 
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