linux-kernel - Re: [PATCH v1] tools/cgroup: introduce cgroup v2 memory.events listener

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Message-ID: <eqvaejfo5uoz5m7e5g3wjgegfo4ribajdgu57fst3hu5m6gfa4@beugaul6pjjz>
Date:   Wed, 1 Nov 2023 16:56:47 +0100
From:   Michal Koutný <mkoutny@...e.com>
To:     Dmitry Rokosov <ddrokosov@...utedevices.com>
Cc:     hannes@...xchg.org, mhocko@...nel.org, roman.gushchin@...ux.dev,
        shakeelb@...gle.com, muchun.song@...ux.dev,
        akpm@...ux-foundation.org, kernel@...rdevices.ru,
        rockosov@...il.com, cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v1] tools/cgroup: introduce cgroup v2 memory.events
 listener

Hi.

I think the tools/cgroup/cgroup_event_listener.c was useful in the past
to demonstrate the non-traditional API of cgroup.event_control with FDs
passing left and right.

On Fri, Oct 13, 2023 at 09:41:07PM +0300, Dmitry Rokosov <ddrokosov@...utedevices.com> wrote:
> This is a simple listener for memory events that handles counter
> changes in runtime. It can be set up for a specific memory cgroup v2.

Event files on v2 are based on more standard poll or inotify APIs so
they don't need such a (cgroup specific) demo. Additionally, the demo
program lists individual events, so it'd be a maintenance burden to keep
them in sync with the kernel implementation.

My .02€,
Michal

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