Re: + pid-delete-reserved_pids.patch added to -mm tree

[Oleg Nesterov]

Hi Alexey,

On 10/02, Andrew Morton wrote:
>
> From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
> Subject: pid: delete RESERVED_PIDS
>
> RESERVED_PIDS had a noble goal: to protect root from PID exhaustion since
> at least ~2.5.40

I am just curious, where did you find the change which documents this goal?

> except it never did that because there was no capability
> or uid checks.
>
> Allow small pids to be allocated after rollover, there is nothing sacred
> about them.
>
> Resource exhaustion should be handled by rlimits and/or kernel memory
> accounting.

I won't argue, but I always thought that the only purpose of RESERVED_PIDS
is to make the system/kernek daemons started at boot time more "visible" in
/usr/bin/ps output.

Oleg.