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Thu, 22 Jun 2023 01:55:40 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id h2-20020a170902f7c200b001b549fce345sm4806971plw.230.2023.06.22.01.55.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jun 2023 01:55:39 -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 Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-bcache@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Qi Zheng Subject: [PATCH 12/29] mbcache: dynamically allocate the mbcache shrinker Date: Thu, 22 Jun 2023 16:53:18 +0800 Message-Id: <20230622085335.77010-13-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230622085335.77010-1-zhengqi.arch@bytedance.com> References: <20230622085335.77010-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org In preparation for implementing lockless slab shrink, we need to dynamically allocate the mbcache shrinker, so that it can be freed asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU read-side critical section when releasing the struct mb_cache. Signed-off-by: Qi Zheng --- fs/mbcache.c | 39 +++++++++++++++++++++------------------ 1 file changed, 21 insertions(+), 18 deletions(-) diff --git a/fs/mbcache.c b/fs/mbcache.c index 2a4b8b549e93..fec393e55a66 100644 --- a/fs/mbcache.c +++ b/fs/mbcache.c @@ -37,7 +37,7 @@ struct mb_cache { struct list_head c_list; /* Number of entries in cache */ unsigned long c_entry_count; - struct shrinker c_shrink; + struct shrinker *c_shrink; /* Work for shrinking when the cache has too many entries */ struct work_struct c_shrink_work; }; @@ -293,8 +293,7 @@ EXPORT_SYMBOL(mb_cache_entry_touch); static unsigned long mb_cache_count(struct shrinker *shrink, struct shrink_control *sc) { - struct mb_cache *cache = container_of(shrink, struct mb_cache, - c_shrink); + struct mb_cache *cache = shrink->private_data; return cache->c_entry_count; } @@ -333,8 +332,8 @@ static unsigned long mb_cache_shrink(struct mb_cache *cache, static unsigned long mb_cache_scan(struct shrinker *shrink, struct shrink_control *sc) { - struct mb_cache *cache = container_of(shrink, struct mb_cache, - c_shrink); + struct mb_cache *cache = shrink->private_data; + return mb_cache_shrink(cache, sc->nr_to_scan); } @@ -370,26 +369,30 @@ struct mb_cache *mb_cache_create(int bucket_bits) cache->c_hash = kmalloc_array(bucket_count, sizeof(struct hlist_bl_head), GFP_KERNEL); - if (!cache->c_hash) { - kfree(cache); - goto err_out; - } + if (!cache->c_hash) + goto err_c_hash; + for (i = 0; i < bucket_count; i++) INIT_HLIST_BL_HEAD(&cache->c_hash[i]); - cache->c_shrink.count_objects = mb_cache_count; - cache->c_shrink.scan_objects = mb_cache_scan; - cache->c_shrink.seeks = DEFAULT_SEEKS; - if (register_shrinker(&cache->c_shrink, "mbcache-shrinker")) { - kfree(cache->c_hash); - kfree(cache); - goto err_out; - } + cache->c_shrink = shrinker_alloc_and_init(mb_cache_count, mb_cache_scan, + 0, DEFAULT_SEEKS, 0, cache); + if (!cache->c_shrink) + goto err_shrinker; + + if (register_shrinker(cache->c_shrink, "mbcache-shrinker")) + goto err_register; INIT_WORK(&cache->c_shrink_work, mb_cache_shrink_worker); return cache; +err_register: + shrinker_free(cache->c_shrink); +err_shrinker: + kfree(cache->c_hash); +err_c_hash: + kfree(cache); err_out: return NULL; } @@ -406,7 +409,7 @@ void mb_cache_destroy(struct mb_cache *cache) { struct mb_cache_entry *entry, *next; - unregister_shrinker(&cache->c_shrink); + unregister_and_free_shrinker(cache->c_shrink); /* * We don't bother with any locking. Cache must not be used at this