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[73.93.239.127]) by smtp.gmail.com with ESMTPSA id t12sm2999111pfe.203.2021.03.11.11.09.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Mar 2021 11:09:22 -0800 (PST) From: Yang Shi To: guro@fb.com, ktkhai@virtuozzo.com, vbabka@suse.cz, shakeelb@google.com, david@fromorbit.com, hannes@cmpxchg.org, mhocko@suse.com, akpm@linux-foundation.org Cc: shy828301@gmail.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [v10 PATCH 11/13] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers Date: Thu, 11 Mar 2021 11:08:43 -0800 Message-Id: <20210311190845.9708-12-shy828301@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210311190845.9708-1-shy828301@gmail.com> References: <20210311190845.9708-1-shy828301@gmail.com> MIME-Version: 1.0 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2DE93E005F07 X-Stat-Signature: pp1rp5rmdmhtseege7dzegfykthtosmm Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf30; identity=mailfrom; envelope-from=""; helo=mail-pl1-f182.google.com; client-ip=209.85.214.182 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615489757-192093 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: Now nr_deferred is available on per memcg level for memcg aware shrinkers= , so don't need allocate shrinker->nr_deferred for such shrinkers anymore. The prealloc_memcg_shrinker() would return -ENOSYS if !CONFIG_MEMCG or me= mcg is disabled by kernel command line, then shrinker's SHRINKER_MEMCG_AWARE flag would b= e cleared. This makes the implementation of this patch simpler. Acked-by: Vlastimil Babka Reviewed-by: Kirill Tkhai Acked-by: Roman Gushchin Reviewed-by: Shakeel Butt Signed-off-by: Yang Shi --- mm/vmscan.c | 31 ++++++++++++++++--------------- 1 file changed, 16 insertions(+), 15 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 5bc6975cb635..324c34c6e5cf 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -346,6 +346,9 @@ static int prealloc_memcg_shrinker(struct shrinker *s= hrinker) { int id, ret =3D -ENOMEM; =20 + if (mem_cgroup_disabled()) + return -ENOSYS; + down_write(&shrinker_rwsem); /* This may call shrinker, so it must use down_read_trylock() */ id =3D idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL); @@ -425,7 +428,7 @@ static bool writeback_throttling_sane(struct scan_con= trol *sc) #else static int prealloc_memcg_shrinker(struct shrinker *shrinker) { - return 0; + return -ENOSYS; } =20 static void unregister_memcg_shrinker(struct shrinker *shrinker) @@ -537,8 +540,18 @@ static unsigned long lruvec_lru_size(struct lruvec *= lruvec, enum lru_list lru, */ int prealloc_shrinker(struct shrinker *shrinker) { - unsigned int size =3D sizeof(*shrinker->nr_deferred); + unsigned int size; + int err; + + if (shrinker->flags & SHRINKER_MEMCG_AWARE) { + err =3D prealloc_memcg_shrinker(shrinker); + if (err !=3D -ENOSYS) + return err; =20 + shrinker->flags &=3D ~SHRINKER_MEMCG_AWARE; + } + + size =3D sizeof(*shrinker->nr_deferred); if (shrinker->flags & SHRINKER_NUMA_AWARE) size *=3D nr_node_ids; =20 @@ -546,28 +559,16 @@ int prealloc_shrinker(struct shrinker *shrinker) if (!shrinker->nr_deferred) return -ENOMEM; =20 - if (shrinker->flags & SHRINKER_MEMCG_AWARE) { - if (prealloc_memcg_shrinker(shrinker)) - goto free_deferred; - } - return 0; - -free_deferred: - kfree(shrinker->nr_deferred); - shrinker->nr_deferred =3D NULL; - return -ENOMEM; } =20 void free_prealloced_shrinker(struct shrinker *shrinker) { - if (!shrinker->nr_deferred) - return; - if (shrinker->flags & SHRINKER_MEMCG_AWARE) { down_write(&shrinker_rwsem); unregister_memcg_shrinker(shrinker); up_write(&shrinker_rwsem); + return; } =20 kfree(shrinker->nr_deferred); --=20 2.26.2