Re: [PATCH RFC v2 0/4] procfs: make reference pidns more user-visible

[Christian Brauner]

On Wed, Jul 23, 2025 at 09:18:50AM +1000, Aleksa Sarai wrote:
> Ever since the introduction of pid namespaces, procfs has had very
> implicit behaviour surrounding them (the pidns used by a procfs mount is
> auto-selected based on the mounting process's active pidns, and the
> pidns itself is basically hidden once the mount has been constructed).
> 
> /* pidns mount option for procfs */

I like it. I think this will be very useful!
Fwiw, I think sysfs could probably use the same treatment.
It should probably gain a pidns & netns mount option and the ioctls to
get those out of sysfs so you know where that sysfs belongs. Thoughts?