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From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
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>,
	Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
	Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	kernel-team-b10kYP2dOMg@public.gmane.org,
	pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org,
	efault-Mmb7MZpHnFY@public.gmane.org,
	torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org
Subject: Re: [RFC PATCH-cgroup 1/6] cgroup: Relax the no internal process constraint
Date: Wed, 21 Jun 2017 17:39:05 -0400	[thread overview]
Message-ID: <20170621213905.GD14720@htj.duckdns.org> (raw)
In-Reply-To: <0c752151-f4aa-cda0-ba36-77cdc7dc25c6-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Hello,

On Wed, Jun 21, 2017 at 05:37:00PM -0400, Waiman Long wrote:
> > What happens when we add domain handling to CPU so that it is both a
> > domain and resource controller?  Even if that somehow can be resolved,
> > wouldn't that come with a rather surprising userland behavior changes?
> > Also, I'm not sure what we're achieving by doing this.  It doesn't
> > really relax the restriction.  It just turns it off implicitly when
> > certain conditions are met, which doesn't really allow any real
> > capabilities and at least to me the behaviors feel more subtle and
> > complicated than before.
> 
> I think CPU isn't a good example for that.

Can you please elaborate?

> Another alternative is to treat no internal process as a controller
> attribute. Then we don't need to worry about this intricate question and
> let the  controllers decide if they will allow internal processes.

Isn't that what "threaded" is?

Thanks.

-- 
tejun

  parent reply	other threads:[~2017-06-21 21:39 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-14 15:05 [RFC PATCH-cgroup 0/6] cgroup: bypass and subtree root modes Waiman Long
2017-06-14 15:05 ` [RFC PATCH-cgroup 1/6] cgroup: Relax the no internal process constraint Waiman Long
     [not found]   ` <1497452737-11125-2-git-send-email-longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-06-21 20:40     ` Tejun Heo
2017-06-21 21:37       ` Waiman Long
     [not found]         ` <0c752151-f4aa-cda0-ba36-77cdc7dc25c6-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-06-21 21:39           ` Tejun Heo [this message]
     [not found]             ` <20170621213905.GD14720-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org>
2017-06-21 21:50               ` Waiman Long
2017-06-21 22:02                 ` Tejun Heo
2017-06-14 15:05 ` [RFC PATCH-cgroup 2/6] cgroup: Enable bypass mode in cgroup v2 Waiman Long
     [not found]   ` <1497452737-11125-3-git-send-email-longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-06-21 21:17     ` Tejun Heo
     [not found]       ` <20170621211701.GB14720-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org>
2017-06-22 20:07         ` Waiman Long
2017-06-14 15:05 ` [RFC PATCH-cgroup 3/6] cgroup: Allow bypss mode in subtree_control Waiman Long
2017-06-14 15:05 ` [RFC PATCH-cgroup 4/6] cgroup: Introduce subtree root mode Waiman Long
     [not found]   ` <1497452737-11125-5-git-send-email-longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-06-21 21:38     ` Tejun Heo
     [not found]       ` <20170621213807.GC14720-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org>
2017-06-22 20:27         ` Waiman Long
2017-06-14 15:05 ` [RFC PATCH-cgroup 5/6] cgroup: Skip dying css in cgroup_apply_control_{enable,disable} Waiman Long
2017-06-21 21:42   ` Tejun Heo
2017-06-21 22:01     ` Waiman Long
     [not found]       ` <81c62822-8bb6-ae68-112a-dad49414e3f1-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-06-21 22:04         ` Tejun Heo
     [not found]           ` <20170621220438.GB18600-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org>
2017-06-21 22:19             ` Waiman Long
2017-06-14 15:05 ` [RFC PATCH-cgroup 6/6] cgroup: Make debug controller display bypass and subtree root modes info Waiman Long

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