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Wed, 23 Aug 2023 20:47:38 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id t6-20020a63b246000000b005579f12a238sm10533157pgo.86.2023.08.23.20.47.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Aug 2023 20:47:38 -0700 (PDT) From: Qi Zheng To: akpm@linux-foundation.org, david@fromorbit.com, tkhai@ya.ru, vbabka@suse.cz, roman.gushchin@linux.dev, djwong@kernel.org, brauner@kernel.org, paulmck@kernel.org, tytso@mit.edu, steven.price@arm.com, cel@kernel.org, senozhatsky@chromium.org, yujie.liu@intel.com, gregkh@linuxfoundation.org, muchun.song@linux.dev Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Qi Zheng , Coly Li , Kent Overstreet , linux-bcache@vger.kernel.org Subject: [PATCH v5 26/45] bcache: dynamically allocate the md-bcache shrinker Date: Thu, 24 Aug 2023 11:42:45 +0800 Message-Id: <20230824034304.37411-27-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230824034304.37411-1-zhengqi.arch@bytedance.com> References: <20230824034304.37411-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: ED603180006 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: n1p3kcnj6qjnioa5mjtjeu1r4xy7firg X-HE-Tag: 1692848859-633130 X-HE-Meta: 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 gdLbFUU1 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 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: In preparation for implementing lockless slab shrink, use new APIs to dynamically allocate the md-bcache shrinker, so that it can be freed asynchronously via RCU. Then it doesn't need to wait for RCU read-side critical section when releasing the struct cache_set. Signed-off-by: Qi Zheng CC: Coly Li CC: Kent Overstreet CC: linux-bcache@vger.kernel.org --- drivers/md/bcache/bcache.h | 2 +- drivers/md/bcache/btree.c | 27 ++++++++++++++++----------- drivers/md/bcache/sysfs.c | 3 ++- 3 files changed, 19 insertions(+), 13 deletions(-) diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index 5a79bb3c272f..c622bc50f81b 100644 --- a/drivers/md/bcache/bcache.h +++ b/drivers/md/bcache/bcache.h @@ -541,7 +541,7 @@ struct cache_set { struct bio_set bio_split; /* For the btree cache */ - struct shrinker shrink; + struct shrinker *shrink; /* For the btree cache and anything allocation related */ struct mutex bucket_lock; diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index fd121a61f17c..ae5cbb55861f 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -667,7 +667,7 @@ static int mca_reap(struct btree *b, unsigned int min_order, bool flush) static unsigned long bch_mca_scan(struct shrinker *shrink, struct shrink_control *sc) { - struct cache_set *c = container_of(shrink, struct cache_set, shrink); + struct cache_set *c = shrink->private_data; struct btree *b, *t; unsigned long i, nr = sc->nr_to_scan; unsigned long freed = 0; @@ -734,7 +734,7 @@ static unsigned long bch_mca_scan(struct shrinker *shrink, static unsigned long bch_mca_count(struct shrinker *shrink, struct shrink_control *sc) { - struct cache_set *c = container_of(shrink, struct cache_set, shrink); + struct cache_set *c = shrink->private_data; if (c->shrinker_disabled) return 0; @@ -752,8 +752,8 @@ void bch_btree_cache_free(struct cache_set *c) closure_init_stack(&cl); - if (c->shrink.list.next) - unregister_shrinker(&c->shrink); + if (c->shrink) + shrinker_free(c->shrink); mutex_lock(&c->bucket_lock); @@ -828,14 +828,19 @@ int bch_btree_cache_alloc(struct cache_set *c) c->verify_data = NULL; #endif - c->shrink.count_objects = bch_mca_count; - c->shrink.scan_objects = bch_mca_scan; - c->shrink.seeks = 4; - c->shrink.batch = c->btree_pages * 2; + c->shrink = shrinker_alloc(0, "md-bcache:%pU", c->set_uuid); + if (!c->shrink) { + pr_warn("bcache: %s: could not allocate shrinker\n", __func__); + return 0; + } + + c->shrink->count_objects = bch_mca_count; + c->shrink->scan_objects = bch_mca_scan; + c->shrink->seeks = 4; + c->shrink->batch = c->btree_pages * 2; + c->shrink->private_data = c; - if (register_shrinker(&c->shrink, "md-bcache:%pU", c->set_uuid)) - pr_warn("bcache: %s: could not register shrinker\n", - __func__); + shrinker_register(c->shrink); return 0; } diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index 0e2c1880f60b..45d8af755de6 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -866,7 +866,8 @@ STORE(__bch_cache_set) sc.gfp_mask = GFP_KERNEL; sc.nr_to_scan = strtoul_or_return(buf); - c->shrink.scan_objects(&c->shrink, &sc); + if (c->shrink) + c->shrink->scan_objects(c->shrink, &sc); } sysfs_strtoul_clamp(congested_read_threshold_us,