linux-kernel - Re: [PATCH 2/5] mm: migration of hugetlbfs page skip memcg

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Message-ID: <CALvZod7e06CizEkpeCCSKLmT1fb=93EubSo6+yQD_zM69+01Ag@mail.gmail.com>
Date:   Mon, 31 Aug 2020 07:40:33 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alex Shi <alex.shi@...ux.alibaba.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Matthew Wilcox <willy@...radead.org>, Qian Cai <cai@....pw>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH 2/5] mm: migration of hugetlbfs page skip memcg

On Sun, Aug 30, 2020 at 2:01 PM Hugh Dickins <hughd@...gle.com> wrote:
>
> hugetlbfs pages do not participate in memcg: so although they do find
> most of migrate_page_states() useful, it would be better if they did
> not call into mem_cgroup_migrate() - where Qian Cai reported that LTP's
> move_pages12 triggers the warning in Alex Shi's prospective commit
> "mm/memcg: warning on !memcg after readahead page charged".
>
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

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