linux-kernel - Re: [PATCH v7 10/10] memcg: enable accounting for ldt

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Message-ID: <CALvZod4OjK75uh2nHA8QOfefUSXD7ZSxm3qaQY+aA9zDuKmNnw@mail.gmail.com>
Date:   Tue, 27 Jul 2021 15:36:54 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Vasily Averin <vvs@...tuozzo.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Cgroups <cgroups@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Roman Gushchin <guro@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 10/10] memcg: enable accounting for ldt_struct objects

On Mon, Jul 26, 2021 at 10:34 PM Vasily Averin <vvs@...tuozzo.com> wrote:
>
> Each task can request own LDT and force the kernel to allocate up to
> 64Kb memory per-mm.
>
> There are legitimate workloads with hundreds of processes and there
> can be hundreds of workloads running on large machines.
> The unaccounted memory can cause isolation issues between the workloads
> particularly on highly utilized machines.
>
> It makes sense to account for this objects to restrict the host's memory
> consumption from inside the memcg-limited container.
>
> Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
> Acked-by: Borislav Petkov <bp@...e.de>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>