linux-kernel - Re: [PATCH] memcg: add support to generate the total count of children from root

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Message-ID: <CANfR36hw8iSSszSt4sNh+ika3vTdXQnXHPLj5t2iLL=5-nzZZw@mail.gmail.com>
Date:   Tue, 24 Nov 2020 13:47:07 +0000
From:   Aaron Tomlin <atomlin@...hat.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>, hannes@...xchg.org,
        vdavydov.dev@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
        cgroups@...r.kernel.org, linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] memcg: add support to generate the total count of
 children from root

On Tue, 24 Nov 2020 at 13:36, Michal Hocko <mhocko@...e.com> wrote:

Michal,

> This like any other user visible interface would be a much easier sell
> if there was a clear usecase to justify it. I do not see anything
> controversial about exporting such a value but my general take is that
> we are only adding new interface when existing ones are insufficient. A
> performance might be a very good reason but that would really require to
> come with some real life numbers.

Fair enough and understood.

At this stage, I unfortunately do not have such supporting data. This was only
useful in an isolated situation. Having said this, I thought that the
aforementioned interface would be helpful to others, in particular, given the
known limitation.

Kind regards,
-- 
Aaron Tomlin