linux-kernel - Re: [PATCH] mm: introduce entrance for root_mem

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Message-ID: <Y91Hc3Iu+5VyyIwS@P9FQF9L96D.corp.robot.car>
Date:   Fri, 3 Feb 2023 09:42:11 -0800
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Michal Hocko <mhocko@...e.com>
Cc:     "zhaoyang.huang" <zhaoyang.huang@...soc.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Shakeel Butt <shakeelb@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        Zhaoyang Huang <huangzhaoyang@...il.com>, ke.wang@...soc.com
Subject: Re: [PATCH] mm: introduce entrance for root_mem_cgroup's current

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@...soc.com>
> > 
> > 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