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From:   Shakeel Butt <shakeelb@google.com>
Date:   Tue, 12 Jan 2021 16:18:44 -0800
Message-ID: <CALvZod4am_dNcj2+YZmraCj0+BYHB9PnQqKcrhiOnV8gzd+S3w@mail.gmail.com>
Subject: Re: [PATCH] mm: net: memcg accounting for TCP rx zerocopy
To:     Arjun Roy <arjunroy@google.com>
Cc:     Roman Gushchin <guro@fb.com>, Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Linux MM <linux-mm@kvack.org>,
        Cgroups <cgroups@vger.kernel.org>,
        netdev <netdev@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Tue, Jan 12, 2021 at 4:12 PM Arjun Roy <arjunroy@google.com> wrote:
>
> On Tue, Jan 12, 2021 at 3:48 PM Roman Gushchin <guro@fb.com> wrote:
> >
[snip]
> > Historically we have a corresponding vmstat counter to each charged page.
> > It helps with finding accounting/stastistics issues: we can check that
> > memory.current ~= anon + file + sock + slab + percpu + stack.
> > It would be nice to preserve such ability.
> >
>
> Perhaps one option would be to have it count as a file page, or have a
> new category.
>

Oh these are actually already accounted for in NR_FILE_MAPPED.