From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH v3] cpuset: Enable cpuset controller in default hierarchy
Date: Mon, 27 Nov 2017 13:42:32 -0800
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To: Waiman Long <longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>, Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>, Christian Brauner <christian.brauner-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>, =?iso-8859-1?Q?St=E9phane?= Graber <stgraber-GeWIH/nMZzLQT0dZR+AlfA@public.gmane.org>, Serge Hallyn <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>

Hello, Waiman.

On Mon, Nov 27, 2017 at 04:19:57PM -0500, Waiman Long wrote:
> > Let's start just with [e]cpus and [e]mems.  The flags interface looks
> > fine but the implementations of these features are really bad and
> > cgroup2 doesn't migrate resources for other controllers either anyway.
> 
> That is added because the mem_migrate feature is used in libvirt, I
> think. I am thinking of add a "[EXPERIMENTAL]" tag to the flags to
> indicate that it is subject to change.

I see.  Do you happen to know what it's used for and why that's
necessary just so that we can evaluate it better?  I'm not quite sure
what adding [EXPERIMENTAL] tag would achieve.  If we expose the
feature and people use it, we just have to keep it anyway.

Thanks.

-- 
tejun