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

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Date:   Tue, 3 Oct 2017 17:53:15 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     akpm@...ux-foundation.org
Cc:     adobriyan@...il.com, ebiederm@...ssion.com, keescook@...omium.org,
        mm-commits@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: + pid-delete-reserved_pids.patch added to -mm tree

Hi Alexey,

On 10/02, Andrew Morton wrote:
>
> From: Alexey Dobriyan <adobriyan@...il.com>
> 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.