Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 13 Aug 2018 06:48:42 -0700
From:   Tejun Heo <tj@kernel.org>
To:     Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        cgroups@vger.kernel.org, Michal Hocko <mhocko@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Roman Gushchin <guro@fb.com>,
        Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH RFC 1/3] cgroup: list all subsystem states in debugfs
 files
Message-ID: <20180813134842.GF3978217@devbig004.ftw2.facebook.com>
References: <153414348591.737150.14229960913953276515.stgit@buzz>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <153414348591.737150.14229960913953276515.stgit@buzz>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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