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% |
-----------------+--------------+------------+
I do believe that Suka's hierarchical model is better than mine,
but my point is: let's support the flat model as well.
Thanks,
Pavel.
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