Re: [PATCH 0/9 RFC] cgroup: separate rstat trees

[Shakeel Butt <shakeel.butt@linux.dev>]

Thanks JP for the awesome work. Please CC Tejun and Michal in the
followup revisions.

On Mon, Dec 23, 2024 at 05:13:53PM -0800, JP Kobryn wrote:
> I've been experimenting with these changes to allow for separate
> updating/flushing of cgroup stats per-subsystem. The idea was instead of having
> a single per-cpu rstat tree for managing stats across all subsystems, we could
> maybe split up the rstat trees into separate trees for each subsystem. So each
> cpu would have individual trees for each subsystem. It would allow subsystems
> to update and flush their stats without having any contention with others, i.e.
> the io subsystem would not have to wait for an in progress memory subsystem
> flush to finish. The core change is moving the rstat entities off of the cgroup
> struct and onto the cgroup_subsystem_state struct. Every patch revolves around
> that concept.
> 
> I reached a point where this started to feel stable in my local testing, so I
> wanted to share and get feedback on this approach.

For the cover letter, please start with describing the problem you are
trying to solve and then possibly give an overview of the solution you
are proposing.