linux-kernel - Re: [PATCH RFC 1/3] cgroup: list all subsystem states in debugfs files

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Message-ID: <20180813134842.GF3978217@devbig004.ftw2.facebook.com>
Date:   Mon, 13 Aug 2018 06:48:42 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Roman Gushchin <guro@...com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH RFC 1/3] cgroup: list all subsystem states in debugfs
 files

Hello, Konstantin.

On Mon, Aug 13, 2018 at 09:58:05AM +0300, Konstantin Khlebnikov wrote:
> After removing cgroup subsystem state could leak or live in background
> forever because it is pinned by some reference. For example memory cgroup
> could be pinned by pages in cache or tmpfs.
> 
> This patch adds common debugfs interface for listing basic state for each
> controller. Controller could define callback for dumping own attributes.
> 
> In file /sys/kernel/debug/cgroup/<controller> each line shows state in
> format: <common_attr>=<value>... [-- <controller_attr>=<value>... ]

Seems pretty useful to me.  Roman, Johannes, what do you guys think?

Thanks.

-- 
tejun