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Tue, 01 Sep 2020 08:03:48 -0700 (PDT) Date: Tue, 1 Sep 2020 11:02:32 -0400 From: Johannes Weiner To: Hugh Dickins Cc: Andrew Morton , Alex Shi , Michal Hocko , Mike Kravetz , Shakeel Butt , Matthew Wilcox , Qian Cai , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 2/5] mm: migration of hugetlbfs page skip memcg Message-ID: <20200901150232.GB45118@cmpxchg.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 21460180F8B80 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 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 Sun, Aug 30, 2020 at 02:01:30PM -0700, Hugh Dickins wrote: > hugetlbfs pages do not participate in memcg: so although they do find > most of migrate_page_states() useful, it would be better if they did > not call into mem_cgroup_migrate() - where Qian Cai reported that LTP's > move_pages12 triggers the warning in Alex Shi's prospective commit > "mm/memcg: warning on !memcg after readahead page charged". > > Signed-off-by: Hugh Dickins Acked-by: Johannes Weiner