Re: [RFC PATCH v2] cgroup: Track time in cgroup v2 freezer

[Tiffany Yang]

Tejun Heo <tj@xxxxxxxxxx> writes:

> On Thu, Jul 17, 2025 at 09:52:38PM +0800, Chen Ridong wrote:
> > > With the given implementation (and use scenario), this'd better exposed
> > > in
> > >   cgroup.freeze.stat.local
> > >

> > Would it be possible to add this field to either cgroup.event or  
> > cgroup.stat?
> > Since the frozen status is already tracked in cgroup.event, this  
> > placement would maintain better
> > cohesion with existing metrics.

> > This is just a suggestion.

> Yeah, given that the freezer is an integral part of cgroup core, using
> cgroup.stat[.local] probably makes more sense.

> Thanks.

One of the reasons I avoided cgroup.stat was because I interpreted its
purpose to be for exposing cgroup metadata (i.e., descendants and
descendants per subsystem), and I didn't think this value fit in neatly.

It doesn't seem like there currently exists a cgroup.stat.local, but if
that is the preferred location for this accounting, I could create one
and print it there!

--
Tiffany Y. Yang