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

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Message-ID: <20200811150505.GA650506@cmpxchg.org>
Date:   Tue, 11 Aug 2020 11:05:05 -0400
From:   Johannes Weiner <hannes@...xchg.org>
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>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>, linux-mm@...ck.org,
        kernel-team@...com, 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 11:45:13AM -0700, Roman Gushchin 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>

Acked-by: Johannes Weiner <hannes@...xchg.org>