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charset=us-ascii Content-Disposition: inline In-Reply-To: <1584942732-2184-6-git-send-email-iamjoonsoo.kim@lge.com> 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, Mar 23, 2020 at 02:52:09PM +0900, js1304@gmail.com wrote: > From: Joonsoo Kim > > When implementing workingset detection for anonymous page, I found > some swapcache pages with NULL memcg. They are brought in by swap > readahead and nobody has touched it. > > The idea behind the workingset code is to tell on page fault time > whether pages have been previously used or not. Since this page > hasn't been used, don't store a shadow entry for it; when it later > faults back in, we treat it as the new page that it is. > > Signed-off-by: Joonsoo Kim Acked-by: Johannes Weiner