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Fri, 16 Apr 2021 21:38:20 -0700 (PDT) Received: from localhost.bytedance.net ([139.177.225.228]) by smtp.gmail.com with ESMTPSA id w21sm7064775pjy.21.2021.04.16.21.38.14 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 16 Apr 2021 21:38:19 -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 , Michal Hocko Subject: [PATCH v3 4/8] mm: memcontrol: simplify lruvec_holds_page_lru_lock Date: Sat, 17 Apr 2021 12:35:34 +0800 Message-Id: <20210417043538.9793-5-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210417043538.9793-1-songmuchun@bytedance.com> References: <20210417043538.9793-1-songmuchun@bytedance.com> MIME-Version: 1.0 X-Stat-Signature: jjomhjj9t4bjjnazf8dtufasagcnb8fe X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B1E0E80192C0 Received-SPF: none (bytedance.com>: No applicable sender policy available) receiver=imf27; identity=mailfrom; envelope-from=""; helo=mail-pj1-f53.google.com; client-ip=209.85.216.53 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618634287-96940 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: We already have a helper lruvec_memcg() to get the memcg from lruvec, we do not need to do it ourselves in the lruvec_holds_page_lru_lock(). So us= e lruvec_memcg() instead. And if mem_cgroup_disabled() returns false, the page_memcg(page) (the LRU pages) cannot be NULL. So remove the odd logic of "memcg =3D page_memcg(page) ? : root_mem_cgroup". And use lruvec_pgdat to simplify the code. We can have a single definition for this function that works for !CONFIG_MEMCG, CONFIG_MEMCG + mem_cgroup_disabled() and CONFIG_MEMCG. Signed-off-by: Muchun Song Acked-by: Johannes Weiner Reviewed-by: Shakeel Butt Acked-by: Roman Gushchin Acked-by: Michal Hocko --- include/linux/memcontrol.h | 31 +++++++------------------------ 1 file changed, 7 insertions(+), 24 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index f2a5aaba3577..2fc728492c9b 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -755,22 +755,6 @@ static inline struct lruvec *mem_cgroup_page_lruvec(= struct page *page) return mem_cgroup_lruvec(memcg, pgdat); } =20 -static inline bool lruvec_holds_page_lru_lock(struct page *page, - struct lruvec *lruvec) -{ - pg_data_t *pgdat =3D page_pgdat(page); - const struct mem_cgroup *memcg; - struct mem_cgroup_per_node *mz; - - if (mem_cgroup_disabled()) - return lruvec =3D=3D &pgdat->__lruvec; - - mz =3D container_of(lruvec, struct mem_cgroup_per_node, lruvec); - memcg =3D page_memcg(page) ? : root_mem_cgroup; - - return lruvec->pgdat =3D=3D pgdat && mz->memcg =3D=3D memcg; -} - struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); =20 struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm); @@ -1227,14 +1211,6 @@ static inline struct lruvec *mem_cgroup_page_lruve= c(struct page *page) return &pgdat->__lruvec; } =20 -static inline bool lruvec_holds_page_lru_lock(struct page *page, - struct lruvec *lruvec) -{ - pg_data_t *pgdat =3D page_pgdat(page); - - return lruvec =3D=3D &pgdat->__lruvec; -} - static inline void lruvec_memcg_debug(struct lruvec *lruvec, struct page= *page) { } @@ -1516,6 +1492,13 @@ static inline void unlock_page_lruvec_irqrestore(s= truct lruvec *lruvec, spin_unlock_irqrestore(&lruvec->lru_lock, flags); } =20 +static inline bool lruvec_holds_page_lru_lock(struct page *page, + struct lruvec *lruvec) +{ + return lruvec_pgdat(lruvec) =3D=3D page_pgdat(page) && + lruvec_memcg(lruvec) =3D=3D page_memcg(page); +} + /* Don't lock again iff page's lruvec locked */ static inline struct lruvec *relock_page_lruvec_irq(struct page *page, struct lruvec *locked_lruvec) --=20 2.11.0