linux-kernel - Re: [PATCH 08/18] mm: memcontrol: prepare cgroup vmstat infrastructure for native anon counters

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Message-ID: <20200422064208.GH6780@js1304-desktop>
Date:   Wed, 22 Apr 2020 15:42:09 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Alex Shi <alex.shi@...ux.alibaba.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Roman Gushchin <guro@...com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH 08/18] mm: memcontrol: prepare cgroup vmstat
 infrastructure for native anon counters

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@...xchg.org>

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