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Message-ID: <20180719135224.GE2494@hirez.programming.kicks-ass.net>
Date: Thu, 19 Jul 2018 15:52:24 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Tejun Heo <tj@...nel.org>
Cc: Waiman Long <longman@...hat.com>, Li Zefan <lizefan@...wei.com>,
Johannes Weiner <hannes@...xchg.org>,
Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
kernel-team@...com, pjt@...gle.com, luto@...capital.net,
Mike Galbraith <efault@....de>, torvalds@...ux-foundation.org,
Roman Gushchin <guro@...com>,
Juri Lelli <juri.lelli@...hat.com>,
Patrick Bellasi <patrick.bellasi@....com>
Subject: Re: [PATCH v11 7/9] cpuset: Expose cpus.effective and mems.effective
on cgroup v2 root
On Tue, Jul 03, 2018 at 08:58:23AM -0700, Tejun Heo wrote:
> Hello, Waiman.
>
> On Tue, Jul 03, 2018 at 08:41:31AM +0800, Waiman Long wrote:
> > > So, effective changing when enabling partition on a child feels wrong
> > > to me. It's supposed to contain what's actually allowed to the cgroup
> > > from its parent and that shouldn't change regardless of how those
> > > resources are used. It's still given to the cgroup from its parent.
> >
> > Another way to work around this issue is to expose the reserved_cpus in
> > the parent for holding CPUs that can taken by a chid partition. That
> > will require adding one more cpuset file for those cgroups that are
> > partition roots.
>
> Yeah, that should work.
>
> > I don't mind restricting that to the first level children for now. That
> > does restrict where we can put the container root if we want a separate
> > partition for a container. Let's hear if others have any objection about
> > that.
>
> As currently implemented, partioning locks away the cpus which should
> be a system level decision, not container level, so it makes sense to
> me that it is only available to system root.
I'm terribly confused, what?!
Why would a container not be allowed to create partitions for its
various RT workloads?
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