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

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Message-ID: <CAOm-9ar2zzxZvZ9A0Yu0knn_LNcHsck72wXShFXutYvAN2qu9Q@mail.gmail.com>
Date:   Thu, 26 Jul 2018 08:41:35 +0200
From:   Bruce Merry <bmerry@....ac.za>
To:     "Singh, Balbir" <bsingharora@...il.com>
Cc:     Shakeel Butt <shakeelb@...gle.com>,
        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 26 July 2018 at 02:55, Singh, Balbir <bsingharora@...il.com> wrote:
> Do you by any chance have use_hierarch=1? memcg_stat_show should just rely on counters inside the memory cgroup and the the LRU sizes for each node.

Yes, /sys/fs/cgroup/memory/memory.use_hierarchy is 1. I assume systemd
is doing that.

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