Messages in this thread | | | Date | Wed, 18 Sep 2002 14:00:19 -0300 (BRT) | From | Rik van Riel <> | Subject | Re: [patch] lockless, scalable get_pid(), for_each_process() elimination, 2.5.35-BK |
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On Wed, 18 Sep 2002, Linus Torvalds wrote: > On Wed, 18 Sep 2002, Rik van Riel wrote: > > > > On second thought ... yes there's a reason. Suppose you have > > 100000 threads on your box already, how long is it going to > > take to walk them all to figure out the pid distribution ?
> The pid space is not a uniform distribution, which your made-up-example > depends on. So you usually walk the 100000 threads _once_, and then you > don't have to walk them again for quite a long time.
Agreed, you're right there. On the other hand, walking the threads _once_ will take 1.5 minutes on a 500 MHz PII (according to Ingo's measurements).
That's about 18 times the timeout for the NMI oopser and will cause people real trouble.
cheers,
Rik -- Spamtrap of the month: september@surriel.com
http://www.surriel.com/ http://distro.conectiva.com/
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