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Tue, 30 Mar 2021 03:20:44 -0700 (PDT) Received: from localhost.localdomain ([2408:8445:ad30:68d8:c87f:ca1b:dc00:4730]) by smtp.gmail.com with ESMTPSA id k10sm202259pfk.205.2021.03.30.03.20.33 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 30 Mar 2021 03:20:43 -0700 (PDT) From: Muchun Song To: guro@fb.com, hannes@cmpxchg.org, mhocko@kernel.org, akpm@linux-foundation.org, shakeelb@google.com, vdavydov.dev@gmail.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, duanxiongchun@bytedance.com, Muchun Song Subject: [RFC PATCH 01/15] mm: memcontrol: fix page charging in page replacement Date: Tue, 30 Mar 2021 18:15:17 +0800 Message-Id: <20210330101531.82752-2-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210330101531.82752-1-songmuchun@bytedance.com> References: <20210330101531.82752-1-songmuchun@bytedance.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 4438CF4 X-Stat-Signature: ous6w895hfa3hw1qq6jg5d1jqojxfxx8 X-Rspamd-Server: rspam02 Received-SPF: none (bytedance.com>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=mail-pg1-f177.google.com; client-ip=209.85.215.177 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617099642-872281 Content-Transfer-Encoding: quoted-printable 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: The pages aren't accounted at the root level, so do not charge the page to the root memcg in page replacement. Although we do not display the value (mem_cgroup_usage) so there shouldn't be any actual problem, but there is a WARN_ON_ONCE in the page_counter_cancel(). Who knows if it will trigger? So it is better to fix it. Signed-off-by: Muchun Song --- mm/memcontrol.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 249bf6b4d94c..d0c4f6e91e17 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6936,9 +6936,11 @@ void mem_cgroup_migrate(struct page *oldpage, stru= ct page *newpage) /* Force-charge the new page. The old one will be freed soon */ nr_pages =3D thp_nr_pages(newpage); =20 - page_counter_charge(&memcg->memory, nr_pages); - if (do_memsw_account()) - page_counter_charge(&memcg->memsw, nr_pages); + if (!mem_cgroup_is_root(memcg)) { + page_counter_charge(&memcg->memory, nr_pages); + if (do_memsw_account()) + page_counter_charge(&memcg->memsw, nr_pages); + } =20 css_get(&memcg->css); commit_charge(newpage, memcg); --=20 2.11.0