linux-kernel - Re: [PATCH] memcg, kmem: further deprecate kmem.limit_in

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Message-ID: <CALvZod4nG-6DBy_sJKbCg+xrYf1DS2ZJ3zkbHQSc4q8iZiPjwQ@mail.gmail.com>
Date:   Wed, 18 Nov 2020 12:07:40 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Roman Gushchin <guro@...com>, Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] memcg, kmem: further deprecate kmem.limit_in_bytes

On Wed, Nov 18, 2020 at 11:58 AM Michal Hocko <mhocko@...e.com> wrote:
>
> On Wed 18-11-20 09:57:26, Shakeel Butt wrote:
> > The deprecation process of kmem.limit_in_bytes started with the commit
> > 0158115f702 ("memcg, kmem: deprecate kmem.limit_in_bytes") which also
> > explains in detail the motivation behind the deprecation. To summarize,
> > it is the unexpected behavior on hitting the kmem limit. This patch
> > moves the deprecation process to the next stage by disallowing to set
> > the kmem limit. In future we might just remove the kmem.limit_in_bytes
> > file completely.
> >
> > Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
>
> I am not against this. I am just not sure whether one year is enough for
> those users who tend to have a more considervative kernel upgrade path.
> I am not worried about SLES user base much as we didn't even enable
> KMEM accounting when it was still guarded by a config option. Not sure
> about others though.
>
> Considering the code cleanup is not that large,

I was thinking of removing the kmem page counter in the followup but
thought of sending this alone to see if now is the right time.

> I would rather wait some
> more. But you can add
> Acked-by: Michal Hocko <mhocko@...e.com>
>
> Maybe we can ask Andrew to put it into mmotm for few releases.
>

Ok with me. I will send the full series and will ask Andrew to keep
the series in mm tree for a couple of releases.