Re: [PATCH v2] Document /proc/pid PID reuse behavior

Martin Steigerwald
2018-11-07T17:05:05Z

Michal Hocko - 07.11.18, 17:00:
> > > otherwise anybody could simply DoS the system
> > > by consuming all available pids.
> >
> > People can do that today using the instrument of terror widely known
> > as fork(2). The only thing standing between fork(2) and a full
> > process table is RLIMIT_NPROC.
>
> not really. If you really do care about pid space depletion then you
> should use pid cgroup controller.

Its not quite on-topic, but I am curious now: AFAIK PID limit is 16
bits. Right? Could it be raised to 32 bits? I bet it would be a major
change throughout different parts of the kernel.

16 bits sound a bit low these days, not only for PIDs, but also for
connections / ports.

--
Martin