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Date:   Wed, 4 Nov 2020 15:10:19 -0800 (PST)
From:   David Rientjes <rientjes@google.com>
To:     Roman Gushchin <guro@fb.com>
cc:     linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        Shakeel Butt <shakeelb@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>, Tejun Heo <tj@kernel.org>,
        linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH rfc 0/3] mm: memcg: deprecate cgroup v1 non-hierarchical
 mode
In-Reply-To: <20201103212725.3716088-1-guro@fb.com>
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References: <20201103212725.3716088-1-guro@fb.com>
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On Tue, 3 Nov 2020, Roman Gushchin wrote:

> The non-hierarchical cgroup v1 mode is a legacy of early days
> of the memory controller and doesn't bring any value today.
> However, it complicates the code and creates many edge cases
> all over the memory controller code.
> 
> It's a good time to deprecate it completely. This patchset removes
> the internal logic, adjusts the user interface and updates
> the documentation. The alt patch removes some bits of the cgroup
> core code, which become obsolete.
> 
> 
> Roman Gushchin (3):
>   mm: memcg: deprecate the non-hierarchical mode
>   docs: cgroup-v1: reflect the deprecation of the non-hierarchical mode
>   cgroup: remove obsoleted broken_hierarchy and warned_broken_hierarchy
> 

For all three patches:

Acked-by: David Rientjes <rientjes@google.com>

Very welcome change to see, we've always prevented the non-hierarchical 
mode from being set in our kernel.