https://bugzilla.kernel.org/show_bug.cgi?id=216584

            Bug ID: 216584
           Summary: Undocumented mount option subset=pids for proc
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages@kernel-bugs.osdl.org
          Reporter: linux@philippwendler.de
        Regression: No

Since Linux 5.8, proc can be mounted with options subset=pids to hide all
non-task-related information. This is missing from proc(5).

Original patch:
https://lore.kernel.org/all/20200423200316.164518-6-gladkov.alexey@gmail.com/ (local)

The kernel documentation shows the option:
https://www.kernel.org/doc/html/latest/filesystems/proc.html#mount-options

This option is useful when mounting proc for a container nested for example in
a Docker container that hides certain parts of /proc, otherwise one is not
allowed to mount /proc
(https://lkml.kernel.org/lkml/cover.1597931457.git.gladkov.alexey@gmail.com/).
It might be useful to add a note about this as well.

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