Re: [PATCH 2/2] pid: Optional first-fit pid allocation

[Andrew Morton]

On Fri, 21 Feb 2025 18:02:49 +0100 Michal Koutný <mkoutny@xxxxxxxx> wrote:

> --- a/Documentation/admin-guide/sysctl/kernel.rst
> +++ b/Documentation/admin-guide/sysctl/kernel.rst
> @@ -1043,6 +1043,8 @@ The last pid allocated in the current (the one task using this sysctl
>  lives in) pid namespace. When selecting a pid for a next task on fork
>  kernel tries to allocate a number starting from this one.
>  
> +When set to -1, first-fit pid numbering is used instead of the next-fit.
> +

This seems thin.  Is there more we can tell our users?  What are the
visible effects of this?  What are the benefits?  Why would they want
to turn it on?

I mean, there are veritable paragraphs in the changelogs, but just a
single line in the user-facing docs.  Seems there could be more...