Re: [PATCH 0/3] cgroup/misc: Add hwcap masks to the misc controller

[Michal Koutný]

Hello Andrei.

On Fri, Dec 05, 2025 at 12:19:04PM -0800, Andrei Vagin <avagin@xxxxxxxxx> wrote:
> If we are talking about C/R use cases, it should be configured when
> container is started. It can be adjusted dynamically, but all changes
> will affect only new processes. The auxiliary vectors are set on execve.

The questions by Ridong are getting at the reasons why cgroup API
doesn't sound like a good match for these values.
I understand it's tempting to implement this by simply copying some
masks from the enclosing cgroup but since there's little to be done upon
(dynamic) change or a process migration it's overkill.

So I'd look at how other [1] adjustments between fork-exec are done and
fit it with them. I guess prctl would be an option as a substitute for
non-existent setauxval().

Thanks,
Michal

[1] Yes, I admit cgroup migration is among them too. Another one is
setns(2) which is IMO a closer concept for this modified view of HW, I'm
not sure whether hardware namespaces had been brought up (and rejected)
in the past.

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