Re: [patch] lockless, scalable get_pid(), for_each_process() elimination, 2.5.35-BK

From: Linus Torvalds (torvalds@transmeta.com)
Date: Wed Sep 18 2002 - 12:46:35 EST

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

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