netdev - Re: [RFC PATCH net-next] net: Add l3mdev cgroup

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Message-ID: <20160104200518.GD3807@mtj.duckdns.org>
Date:	Mon, 4 Jan 2016 15:05:18 -0500
From:	Tejun Heo <tj@...nel.org>
To:	David Ahern <dsa@...ulusnetworks.com>
Cc:	netdev@...r.kernel.org, cgroups@...r.kernel.org,
	shm@...ulusnetworks.com, roopa@...ulusnetworks.com
Subject: Re: [RFC PATCH net-next] net: Add l3mdev cgroup

Hello,

On Mon, Jan 04, 2016 at 12:59:15PM -0700, David Ahern wrote:
> cgroups have very nice properties that I want to leverage such as
> parent-child inheritance and easy tracking which subsystem instance a task
> belongs. This provides a great kernel foundation for building easy to use
> management tools.
> 
> The documentation for cgroups does not restrict a controller to physical
> resources but rather "it may be anything that wants to act on a group of
> processes." That is exactly what I am doing here - I have a network config
> that is applied to a group of processes similar to net_cls and net_prio (but
> as I stated before those are orthogonal, independent settings from the L3
> domain).

Please read the new version of cgroup documentation.

  https://git.kernel.org/cgit/linux/kernel/git/tj/cgroup.git/tree/Documentation/cgroup.txt?h=for-4.5

cgroup has experienced a lot of problems doing its main job -
hierarchical resource control - from trying to support random things
which want to group threads.  As shown with xt_cgroup, such
identifying usages can be implemented in a way where the subsystem
matches the membership rather than cgroup taking in configurations
which belong to the subsystem, so please investigate that direction.

Thanks.

-- 
tejun
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