linux-kernel - Re: [PATCH v2] cgroup, docs: document the root cgroup behavior of cpu and io controllers

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Message-ID: <20180116160802.GO3460072@devbig577.frc2.facebook.com>
Date:   Tue, 16 Jan 2018 08:08:02 -0800
From:   Tejun Heo <tj@...nel.org>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>, cgroups@...r.kernel.org,
        linux-doc@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] cgroup, docs: document the root cgroup behavior of
 cpu and io controllers

On Wed, Jan 10, 2018 at 11:33:19PM +0100, Maciej S. Szmigiero wrote:
> Currently, cgroups v2 documentation contains only a generic remark that
> "How resource consumption in the root cgroup is governed is up to each
> controller", which isn't really telling users much, who need to dig in the
> code and / or commit messages to learn the exact behavior.
> 
> In cgroups v1 at least the blkio controller had its operation with respect
> to competition between child threads and child cgroups documented in
> blkio-controller.txt, with references to cfq-iosched.txt.
> Also, cgroups v2 documentation describes v1 behavior of both cpu and
> blkio controllers in an "Issues with v1" section.
> 
> Let's document this behavior also for cgroups v2 to make life easier for
> users.
> 
> Signed-off-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>

Applied to cgroup/for-4.16.

Thanks.

-- 
tejun