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Date:   Wed, 22 Apr 2020 15:42:09 +0900
From:   Joonsoo Kim <js1304@gmail.com>
To:     Johannes Weiner <hannes@cmpxchg.org>
Cc:     Alex Shi <alex.shi@linux.alibaba.com>,
        Shakeel Butt <shakeelb@google.com>,
        Hugh Dickins <hughd@google.com>,
        Michal Hocko <mhocko@suse.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Roman Gushchin <guro@fb.com>, linux-mm@kvack.org,
        cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
        kernel-team@fb.com
Subject: Re: [PATCH 08/18] mm: memcontrol: prepare cgroup vmstat
 infrastructure for native anon counters
Message-ID: <20200422064208.GH6780@js1304-desktop>
References: <20200420221126.341272-1-hannes@cmpxchg.org>
 <20200420221126.341272-9-hannes@cmpxchg.org>
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On Mon, Apr 20, 2020 at 06:11:16PM -0400, Johannes Weiner wrote:
> Anonymous compound pages can be mapped by ptes, which means that if we
> want to track NR_MAPPED_ANON, NR_ANON_THPS on a per-cgroup basis, we
> have to be prepared to see tail pages in our accounting functions.
> 
> Make mod_lruvec_page_state() and lock_page_memcg() deal with tail
> pages correctly, namely by redirecting to the head page which has the
> page->mem_cgroup set up.
> 
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

Reviewed-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>