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SubjectRe: [PATCH v3 4/8] cgroup: rstat: support cgroup1
On Wed, Feb 17, 2021 at 03:52:59PM -0500, Johannes Weiner <> wrote:
> It's possible, but I don't think worth the trouble.
You're right. I gave it a deeper look and what would be saved on data,
would be paid in code complexity.

> In this case, we're talking about a relatively small data structure
> and the overhead is per mountpoint.
IIUC, it is per each mountpoint's number of cgroups. But I still accept
the argument above. Furthermore, this can be changed later.

> The default root group has statically preallocated percpu data before
> and after this patch. See cgroup.c:
I stand corrected, the comment is still valid.

Reviewed-by: Michal Koutný <>
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