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

[Pavel Emelyanov]

On 12/07/2010 05:27 PM, Serge E. Hallyn wrote:
> Quoting Pavel Emelyanov (xemul at parallels.com):
>> 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?

How many hundreds are you interested in? :) 128 users didn't
reveal any regressions.

> -serge
> 
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