linux-kernel - Re: [PATCH] sched: Relax a restriction in sched_rt_can

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Message-ID: <1430716247.3129.44.camel@gmail.com>
Date:	Mon, 04 May 2015 07:10:47 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Zefan Li <lizefan@...wei.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH] sched: Relax a restriction in sched_rt_can_attach()

On Mon, 2015-05-04 at 12:39 +0800, Zefan Li wrote:

> >> We are moving toward unified hierarchy where all the cgroup controllers
> >> are bound together, so it would make cgroups easier to use if we have less
> >> restrictions on attaching tasks between cgroups.
> > 
> > Forcing group scheduling overhead on users if they want cpuset or memory
> > cgroup functionality would be far from wonderful.  Am I interpreting the
> > implications of this unification/binding properly?
> > 
> > (I hope not, surely the plan is not to utterly _destroy_ cgroup utility)
> > 
> 
> Some degree of flexibility is provided so that you may disable some controllers
> in a subtree. For example:
> 
> root                  ---> child1
> (cpuset,memory,cpu)        (cpuset,memory)
>                       \
>                        \-> child2
>                            (cpu)

Whew, that's a relief.  Thanks.

	-Mike


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