Re: [PATCH] mm: introduce entrance for root_mem_cgroup's current

[Roman Gushchin]

On Thu, Feb 02, 2023 at 09:27:39AM +0100, Michal Hocko wrote:
> On Thu 02-02-23 12:32:57, zhaoyang.huang wrote:
> > From: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx>
> > 
> > Introducing memory.root_current for the memory charges on root_mem_cgroup.
> 
> Charges are not currently accounted for the root memcg universally. See
> try_charge which is used for all user space and skmem charges. I am not
> 100% sure about objcg based accounting because there is no explicit
> check for the root memcg but this might be hidden somewhere as well.

root_mem_cgroup has no corresponding obj_cgroup: see memcg_online_kmem().

Thanks