linux-kernel - Re: [PATCH memcg 0/1] false global OOM triggered by memcg-limited task

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Message-ID: <CALvZod5Kut63MLVfCkEW5XemqN4Jnd1iEQD_Gk0w5=fPffL8Bg@mail.gmail.com>
Date:   Mon, 18 Oct 2021 22:33:25 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Vasily Averin <vvs@...tuozzo.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>,
        Uladzislau Rezki <urezki@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Cgroups <cgroups@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel@...nvz.org
Subject: Re: [PATCH memcg 0/1] false global OOM triggered by memcg-limited task

On Mon, Oct 18, 2021 at 11:52 AM Vasily Averin <vvs@...tuozzo.com> wrote:
>
> On 18.10.2021 18:07, Shakeel Butt wrote:
> > On Mon, Oct 18, 2021 at 5:27 AM Michal Hocko <mhocko@...e.com> wrote:
> >>
> >> [restore the cc list]
> >>
> >> On Mon 18-10-21 15:14:26, Vasily Averin wrote:
> >>> On 18.10.2021 14:53, Michal Hocko wrote:
> >>>> On Mon 18-10-21 13:05:35, Vasily Averin wrote:
> >>>>> On 18.10.2021 12:04, Michal Hocko wrote:
> >>>>> Here we call try_charge_memcg() that return success and approve the allocation,
> >>>>> however then we hit into kmem limit and fail the allocation.
> >>>>
> >>>> Just to make sure I understand this would be for the v1 kmem explicit
> >>>> limit, correct?
> >>>
> >>> yes, I mean this limit.
> >>
> >> OK, thanks for the clarification. This is a known problem. Have a look
> >> at I think we consider that one to 0158115f702b ("memcg, kmem: deprecate
> >> kmem.limit_in_bytes"). We are reporting the deprecated and to-be removed
> >> status since 2019 without any actual report sugested by the kernel
> >> message. Maybe we should try and remove it and see whether that prompts
> >> some pushback.
> >>
> >
> > Yes, I think now should be the right time to take the next step for
> > deprecation of kmem limits:
> > https://lore.kernel.org/all/20201118175726.2453120-1-shakeelb@google.com/
>
> Are you going to push it to stable kernels too?
>

Not really. Is there a reason I should? More exposure to catch breakage?