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Thu, 18 Mar 2021 04:08:30 -0700 (PDT) Received: from localhost.localdomain ([139.177.225.231]) by smtp.gmail.com with ESMTPSA id e21sm1779509pgv.74.2021.03.18.04.08.26 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 18 Mar 2021 04:08:30 -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: [PATCH v4 1/5] mm: memcontrol: introduce obj_cgroup_{un}charge_pages Date: Thu, 18 Mar 2021 19:06:54 +0800 Message-Id: <20210318110658.60892-2-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210318110658.60892-1-songmuchun@bytedance.com> References: <20210318110658.60892-1-songmuchun@bytedance.com> MIME-Version: 1.0 X-Stat-Signature: uzpnijn8x833naianrd7h7zsuboqhmd9 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 870294080F44 Received-SPF: none (bytedance.com>: No applicable sender policy available) receiver=imf17; 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: 1616065711-28154 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 know that the unit of slab object charging is bytes, the unit of kmem page charging is PAGE_SIZE. If we want to reuse obj_cgroup APIs to charge the kmem pages, we should pass PAGE_SIZE (as third parameter) to obj_cgroup_charge(). Because the size is already PAGE_SIZE, we can skip touch the objcg stock. And obj_cgroup_{un}charge_pages() are introduced to charge in units of page level. In the later patch, we also can reuse those two helpers to charge or uncharge a number of kernel pages to a object cgroup. This is just a code movement without any functional changes. Signed-off-by: Muchun Song Acked-by: Roman Gushchin Acked-by: Johannes Weiner Reviewed-by: Shakeel Butt --- mm/memcontrol.c | 46 +++++++++++++++++++++++++++++++--------------- 1 file changed, 31 insertions(+), 15 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 845eec01ef9d..fc22da9805fb 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3056,6 +3056,34 @@ static void memcg_free_cache_id(int id) ida_simple_remove(&memcg_cache_ida, id); } =20 +static inline void obj_cgroup_uncharge_pages(struct obj_cgroup *objcg, + unsigned int nr_pages) +{ + rcu_read_lock(); + __memcg_kmem_uncharge(obj_cgroup_memcg(objcg), nr_pages); + rcu_read_unlock(); +} + +static int obj_cgroup_charge_pages(struct obj_cgroup *objcg, gfp_t gfp, + unsigned int nr_pages) +{ + struct mem_cgroup *memcg; + int ret; + + rcu_read_lock(); +retry: + memcg =3D obj_cgroup_memcg(objcg); + if (unlikely(!css_tryget(&memcg->css))) + goto retry; + rcu_read_unlock(); + + ret =3D __memcg_kmem_charge(memcg, gfp, nr_pages); + + css_put(&memcg->css); + + return ret; +} + /** * __memcg_kmem_charge: charge a number of kernel pages to a memcg * @memcg: memory cgroup to charge @@ -3180,11 +3208,8 @@ static void drain_obj_stock(struct memcg_stock_pcp= *stock) unsigned int nr_pages =3D stock->nr_bytes >> PAGE_SHIFT; unsigned int nr_bytes =3D stock->nr_bytes & (PAGE_SIZE - 1); =20 - if (nr_pages) { - rcu_read_lock(); - __memcg_kmem_uncharge(obj_cgroup_memcg(old), nr_pages); - rcu_read_unlock(); - } + if (nr_pages) + obj_cgroup_uncharge_pages(old, nr_pages); =20 /* * The leftover is flushed to the centralized per-memcg value. @@ -3242,7 +3267,6 @@ static void refill_obj_stock(struct obj_cgroup *obj= cg, unsigned int nr_bytes) =20 int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size) { - struct mem_cgroup *memcg; unsigned int nr_pages, nr_bytes; int ret; =20 @@ -3259,24 +3283,16 @@ int obj_cgroup_charge(struct obj_cgroup *objcg, g= fp_t gfp, size_t size) * refill_obj_stock(), called from this function or * independently later. */ - rcu_read_lock(); -retry: - memcg =3D obj_cgroup_memcg(objcg); - if (unlikely(!css_tryget(&memcg->css))) - goto retry; - rcu_read_unlock(); - nr_pages =3D size >> PAGE_SHIFT; nr_bytes =3D size & (PAGE_SIZE - 1); =20 if (nr_bytes) nr_pages +=3D 1; =20 - ret =3D __memcg_kmem_charge(memcg, gfp, nr_pages); + ret =3D obj_cgroup_charge_pages(objcg, gfp, nr_pages); if (!ret && nr_bytes) refill_obj_stock(objcg, PAGE_SIZE - nr_bytes); =20 - css_put(&memcg->css); return ret; } =20 --=20 2.11.0