Pavel Emelianov wrote:
> OK. We have measured the nptl perf test for init namespace.
> Summary - flat model is very light, Suka's patches break the 
> kernel performance event when CONFIG_PID_NS is off.
> 
>                  |    perf, s   | perf loss  |
> -----------------+--------------+------------+
> 2.6.22-rc4-mm2   | 13.79 ± 0.13 |    ---     |
>                  |              |            |
> suka  + PID_NS=n | 14.07 ± 0.13 |    2.0%    |
> suka  + PID_NS=y | 14.06 ± 0.08 |    2.0%    |
>                  |              |            |
> pavel + PID_NS=n | 13.80 ± 0.07 |    0.0%    |
> pavel + FLAT     | 13.80 ± 0.07 |    0.0%    |
> pavel + MULTI    | 14.28 ± 0.08 |    3.5%    |
> -----------------+--------------+------------+

is that on the same hardware you used last time ? 
2 * Intel(R) Xeon(TM) CPU 3.00GHz with 2GB RAM.

> I do believe that Suka's hierarchical model is better than mine,
> but my point is: let's support the flat model as well.

OK. First thing we can do is to find what they have in common and 
get that included. Then, after the first round, we might even find 
some more to reach the MULTI model :) 

That said, I'm perfectly fine with the FLAT model, because I think
it covers nearly all the real world scenarii i know about : system 
containers, application containers. 

C.
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