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From:   Shakeel Butt <shakeelb@google.com>
Date:   Mon, 18 Oct 2021 10:13:22 -0700
Message-ID: <CALvZod4pET2ZYWwsEP3Q+uGpGNb+TEVgRg5yo1h+mRK-_ZB+Cw@mail.gmail.com>
Subject: Re: [PATCH memcg 0/1] false global OOM triggered by memcg-limited task
To:     Michal Hocko <mhocko@suse.com>
Cc:     Vasily Averin <vvs@virtuozzo.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Roman Gushchin <guro@fb.com>,
        Uladzislau Rezki <urezki@gmail.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Mel Gorman <mgorman@techsingularity.net>,
        Cgroups <cgroups@vger.kernel.org>, Linux MM <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>, kernel@openvz.org
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On Mon, Oct 18, 2021 at 9:51 AM Michal Hocko <mhocko@suse.com> wrote:
>
> On Mon 18-10-21 08:07:20, Shakeel Butt wrote:
> > On Mon, Oct 18, 2021 at 5:27 AM Michal Hocko <mhocko@suse.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/
>
> I completely forgot about your patch.  Anyway, it usually takes us years
> to deprecate something so let's stick with it and consider 2 years as
> years ;)
>

Sure, I will rebase and resend.