linux-kernel - Re: [PATCH mm-unstable RFC 3/5] memcg: calculate root usage from global state

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Message-ID: <rdjvbr5zuwic27s27xcmguce2wfbqiyeu4bjr5pfxhprlxecui@4wsoogvb4ivp>
Date:   Tue, 11 Apr 2023 14:53:20 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH mm-unstable RFC 3/5] memcg: calculate root usage from
 global state

On Mon, Apr 03, 2023 at 10:03:35PM +0000, Yosry Ahmed <yosryahmed@...gle.com> wrote:
> Instead, approximate the root usage from global state. This is not 100%
> accurate, but the root usage has always been ill-defined anyway.

Technically, this approximation should be closer to truth because global
counters aren't subject to flushing "delay".

> 
> Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
> ---
>  mm/memcontrol.c | 24 +++++-------------------
>  1 file changed, 5 insertions(+), 19 deletions(-)

But feel free to add
Reviewed-by: Michal Koutný <mkoutny@...e.com>


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