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Shutemov" , Roman Gushchin , 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200420221126.341272-9-hannes@cmpxchg.org> User-Agent: Mutt/1.5.24 (2015-08-30) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 Reviewed-by: Joonsoo Kim