linux-kernel - Re: [PATCH v3 3/5] mm: memcg/percpu: per-memcg percpu memory statistics

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Message-ID: <CALvZod5NWqfdCq07mPBVUG1ZVzjaDDEnCzz3+sH2O3nMf0Zrzg@mail.gmail.com>
Date:   Tue, 23 Jun 2020 18:35:52 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Linux MM <linux-mm@...ck.org>,
        Kernel Team <kernel-team@...com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] mm: memcg/percpu: per-memcg percpu memory statistics

On Tue, Jun 23, 2020 at 11:47 AM Roman Gushchin <guro@...com> wrote:
>
> Percpu memory can represent a noticeable chunk of the total memory
> consumption, especially on big machines with many CPUs.  Let's track
> percpu memory usage for each memcg and display it in memory.stat.
>
> A percpu allocation is usually scattered over multiple pages (and nodes),
> and can be significantly smaller than a page.  So let's add a byte-sized
> counter on the memcg level: MEMCG_PERCPU_B.  Byte-sized vmstat infra
> created for slabs can be perfectly reused for percpu case.
>
> Signed-off-by: Roman Gushchin <guro@...com>
> Acked-by: Dennis Zhou <dennis@...nel.org>

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