Re: [patch] procfs/procps threading performance speedup, 2.5.62

[Ingo Molnar]

eg. with 16,000 threads in /proc, "ls /proc" is still fast:

     real:0m0.032s   user:0m0.007s   sys:0m0.024s

without those threads, it's:

     real:0m0.014s user:0m0.004s sys:0m0.010s

15 msecs difference. Even simple 'ls' reads the full /proc directory (all
16K+ entries). So performance-wise there's not a big difference.

architecture-wise there is a difference, and i'd be the last one arguing
against a tree-based approach to thread groups. It's much easier to find
threads belonging to a single 'process' via /proc this way - although no
functionality in procps has or requires such a feature currently.

	Ingo