linux-kernel - Re: [PATCH v3 0/6] hugetlb_cgroup: Add hugetlb

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Date:   Wed, 28 Aug 2019 17:42:17 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Mina Almasry <almasrymina@...gle.com>, mike.kravetz@...cle.com,
        shuah@...nel.org, David Rientjes <rientjes@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        khalid.aziz@...cle.com, LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>, linux-kselftest@...r.kernel.org,
        Cgroups <cgroups@...r.kernel.org>,
        aneesh.kumar@...ux.vnet.ibm.com, mkoutny@...e.com
Subject: Re: [PATCH v3 0/6] hugetlb_cgroup: Add hugetlb_cgroup reservation limits

On Wed, Aug 28, 2019 at 4:23 AM Michal Hocko <mhocko@...nel.org> wrote:
>
> On Mon 26-08-19 16:32:34, Mina Almasry wrote:
> >  mm/hugetlb.c                                  | 493 ++++++++++++------
> >  mm/hugetlb_cgroup.c                           | 187 +++++--
>
> This is a lot of changes to an already subtle code which hugetlb
> reservations undoubly are. Moreover cgroupv1 is feature frozen and I am
> not aware of any plans to port the controller to v2. That all doesn't
> sound in favor of this change.

Actually "no plan to port the controller to v2" makes the case strong
for these changes (and other new features) to be done in v1. If there
is an alternative solution in v2 then I can understand the push-back
on changes in v1 but that is not the case here.

Shakeel