Re: [patch] lockless, scalable get_pid(), for_each_process()

[Linus Torvalds]

On Wed, 18 Sep 2002, William Lee Irwin III wrote:
> 
> There were only 10K tasks, with likely consecutively-allocated PID's,
> and some minor background fork()/exit() activity, but there are more
> offenders on the read side than get_pid() itself.
> 
> There is no question of PID space: the full 2^30 was configured in
> the tests done after the PID space expansion. 

I bet the lockup was something else. There have been other bugs recently 
with the task state changes, and the lockup may just have been a regular 
plain lockup. Thread exit has been kind of fragile lately, although it 
looks better now.

		Linus