Re: [PATCH] user_ns: Improve the user_ns on-the-slab packaging

[Serge E. Hallyn]

Quoting Pavel Emelyanov (xemul@xxxxxxxxxxxxx):
> Currently on 64-bit arch the user_namespace is 2096 and when
> being kmalloc-ed it resides on a 4k slab wasting 2003 bytes.
> 
> If we allocate a separate cache for it and reduce the hash size
> from 128 to 64 chains the packaging becomes *much* better - the

Hey Pavel,

I trust you've done some performance tests and found no
regressions with a few hundred users?

-serge
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