linux-kernel - Re: Showing /sys/fs/cgroup/memory/memory.stat very slow on some machines

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Message-ID: <CAOm-9apU_qYR+nmRur-hdPneuv_Y8v2f_Rub6Tsxc98+AuSiZg@mail.gmail.com>
Date:   Wed, 18 Jul 2018 20:43:55 +0200
From:   Bruce Merry <bmerry@....ac.za>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>
Subject: Re: Showing /sys/fs/cgroup/memory/memory.stat very slow on some machines

On 18 July 2018 at 20:13, Shakeel Butt <shakeelb@...gle.com> wrote:
> On Wed, Jul 18, 2018 at 10:58 AM Bruce Merry <bmerry@....ac.za> wrote:
> Yes, if there is no memory pressure such memory can stay around.
>
> On your production machine, before deleting memory containers, you can
> try force_empty to reclaim such memory from them. See if that helps.

Thanks. At the moment the cgroups are all managed by systemd and
docker, but I'll keep that in mind while experimenting.

Bruce
-- 
Bruce Merry
Senior Science Processing Developer
SKA South Africa