From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joonsoo Kim <js1304-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH 08/18] mm: memcontrol: prepare cgroup vmstat
 infrastructure for native anon counters
Date: Wed, 22 Apr 2020 15:42:09 +0900
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References: <20200420221126.341272-1-hannes@cmpxchg.org>
 <20200420221126.341272-9-hannes@cmpxchg.org>
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To: Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>
Cc: Alex Shi <alex.shi-KPsoFbNs7GizrGE5bRqYAgC/G2K4zDHf@public.gmane.org>, Shakeel Butt <shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Michal Hocko <mhocko-IBi9RG/b67k@public.gmane.org>, "Kirill A. Shutemov" <kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>, Roman Gushchin <guro-b10kYP2dOMg@public.gmane.org>, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kernel-team-b10kYP2dOMg@public.gmane.org

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-druUgvl0LCNAfugRpC6u6w@public.gmane.org>

Reviewed-by: Joonsoo Kim <iamjoonsoo.kim-Hm3cg6mZ9cc@public.gmane.org>