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

From: Ingo Molnar (
Date: Wed Sep 18 2002 - 12:59:50 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.

oh. Well, there are a whole lot of other places in the unpatched kernel
that iterate over every task. So with the patch applied, all these lockups
go away?


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