linux-kernel - Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode

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Message-ID: <20170322145225.nsmnvknla752e6yx@hirez.programming.kicks-ass.net>
Date:   Wed, 22 Mar 2017 15:52:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     lizefan@...wei.com, hannes@...xchg.org, mingo@...hat.com,
        pjt@...gle.com, luto@...capital.net, efault@....de,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, lvenanci@...hat.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCHSET for-4.11] cgroup: implement cgroup v2 thread mode

On Tue, Mar 21, 2017 at 01:39:58PM +0100, Peter Zijlstra wrote:
> 
> And yes, having to consider views is new and a direct consequence of
> this new optional feature. But I don't see how its a problem.
> 

So aside from having (RO) links in thread groups for system controllers,
we could also have a ${controller}_parent link back to whatever group is
the actual parent for that specific controller's view.

So then your B's memcg_parent would point to A, not T.

But I feel this is all superfluous window dressing; but if you want to
clarify the filesystem interface, this could be something to consider.