From patchwork Mon Jul 24 09:43:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13324011 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9249CC001DE for ; Mon, 24 Jul 2023 09:56:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232864AbjGXJ4V (ORCPT ); Mon, 24 Jul 2023 05:56:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51472 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232744AbjGXJzi (ORCPT ); Mon, 24 Jul 2023 05:55:38 -0400 Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6FB7055AA for ; Mon, 24 Jul 2023 02:50:54 -0700 (PDT) Received: by mail-pg1-x529.google.com with SMTP id 41be03b00d2f7-55badd6d6feso376820a12.1 for ; Mon, 24 Jul 2023 02:50:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690192207; x=1690797007; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5tyryk3a6lKy52HCDJ7LTSnMns1BMfalny9tATaKfF4=; b=amQ/RyxG43H24ZUKc8otE5jiO+PYmxLlS/jMlPB0P6LNf3YwKIyMMGT5x5GETrJzMq RUBPJl4XNLYJOZfW+4QQddSzJ1AOcHQOg+iS5NlIsw7P4JxkBKv7P6vm/OPtlqHKc3hY SLjp5JA2uLEQMXCeF85H9FjbP+u1neEShB4g/q4BDTYJUem7uHrE3aZx7t8/OvBixlxe PbLUlPG8K2MumMSz8pDMF7zGqwESYJNwxt0dJLhsSfALoKSzpnkM0Hd7rb9gY0+HtLOP 61X4fPzjkMASXPftIRT+bLKVEY2jgFRxsHYQZDL2GJ8BmZMhp7tc/64KlMZKvh3Rfksj 0TFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690192207; x=1690797007; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5tyryk3a6lKy52HCDJ7LTSnMns1BMfalny9tATaKfF4=; b=Y7/0O82Dcep5K/+axhC8UqjDHYgnK3dYNLrIrRcVzsrHuwIi8FhKJwTpJQHj73qMjP LJpnOggdCqxo7Kza8qV4HzLhEbPaJtErM//Mg+fGAoG41A6rkJOWulbCOjR0V+SDKAP1 6gtuj3sXj9m/zg1pGdVtHc1wp7RWlNifOr1OWpF1ik/XRIcHY0ORqi91qqeDWwjb2rOM +6BTrQLsdWZv7MmSVL6czC8f0/tmGwNo+wwEU8yWftITzV/TH+1UULwKJ1oUktgo77dH HN4kc0g8AqP1TWZWh6RbGS2Ws9TxnQvx4gySoiyeoEAqlX8rTvOhpk8/atowC7zd7Dhl ti5Q== X-Gm-Message-State: ABy/qLbdRaU3coXtyjd+6SrKswjuMEH1DwLfZ4kenMEXtAOVu4c/NCWq iiMVruZ3Ag4E1OS2zh/6IsCzkQ== X-Google-Smtp-Source: APBJJlGNSrKSFiHfBgDCDwymx1T6XElAyTc+fmhNn0a9fde+MwuOtWNaHmnJx2SRiMlK6zefGJ37qA== X-Received: by 2002:a17:902:f682:b0:1b3:ec39:f42c with SMTP id l2-20020a170902f68200b001b3ec39f42cmr12377411plg.5.1690192206827; Mon, 24 Jul 2023 02:50:06 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id d5-20020a170902c18500b001bb20380bf2sm8467233pld.13.2023.07.24.02.49.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jul 2023 02:50:06 -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, x86@kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-erofs@lists.ozlabs.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, linux-mtd@lists.infradead.org, rcu@vger.kernel.org, netdev@vger.kernel.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-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Qi Zheng Subject: [PATCH v2 25/47] dm: dynamically allocate the dm-bufio shrinker Date: Mon, 24 Jul 2023 17:43:32 +0800 Message-Id: <20230724094354.90817-26-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230724094354.90817-1-zhengqi.arch@bytedance.com> References: <20230724094354.90817-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In preparation for implementing lockless slab shrink, use new APIs to dynamically allocate the dm-bufio 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 dm_bufio_client. Signed-off-by: Qi Zheng Reviewed-by: Muchun Song --- drivers/md/dm-bufio.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index bc309e41d074..028e30a4b2d0 100644 --- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -963,7 +963,7 @@ struct dm_bufio_client { sector_t start; - struct shrinker shrinker; + struct shrinker *shrinker; struct work_struct shrink_work; atomic_long_t need_shrink; @@ -2368,7 +2368,7 @@ static unsigned long dm_bufio_shrink_scan(struct shrinker *shrink, struct shrink { struct dm_bufio_client *c; - c = container_of(shrink, struct dm_bufio_client, shrinker); + c = shrink->private_data; atomic_long_add(sc->nr_to_scan, &c->need_shrink); queue_work(dm_bufio_wq, &c->shrink_work); @@ -2377,7 +2377,7 @@ static unsigned long dm_bufio_shrink_scan(struct shrinker *shrink, struct shrink static unsigned long dm_bufio_shrink_count(struct shrinker *shrink, struct shrink_control *sc) { - struct dm_bufio_client *c = container_of(shrink, struct dm_bufio_client, shrinker); + struct dm_bufio_client *c = shrink->private_data; unsigned long count = cache_total(&c->cache); unsigned long retain_target = get_retain_buffers(c); unsigned long queued_for_cleanup = atomic_long_read(&c->need_shrink); @@ -2490,15 +2490,19 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign INIT_WORK(&c->shrink_work, shrink_work); atomic_long_set(&c->need_shrink, 0); - c->shrinker.count_objects = dm_bufio_shrink_count; - c->shrinker.scan_objects = dm_bufio_shrink_scan; - c->shrinker.seeks = 1; - c->shrinker.batch = 0; - r = register_shrinker(&c->shrinker, "dm-bufio:(%u:%u)", - MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); - if (r) + c->shrinker = shrinker_alloc(0, "dm-bufio:(%u:%u)", + MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); + if (!c->shrinker) goto bad; + c->shrinker->count_objects = dm_bufio_shrink_count; + c->shrinker->scan_objects = dm_bufio_shrink_scan; + c->shrinker->seeks = 1; + c->shrinker->batch = 0; + c->shrinker->private_data = c; + + shrinker_register(c->shrinker); + mutex_lock(&dm_bufio_clients_lock); dm_bufio_client_count++; list_add(&c->client_list, &dm_bufio_all_clients); @@ -2537,7 +2541,7 @@ void dm_bufio_client_destroy(struct dm_bufio_client *c) drop_buffers(c); - unregister_shrinker(&c->shrinker); + shrinker_unregister(c->shrinker); flush_work(&c->shrink_work); mutex_lock(&dm_bufio_clients_lock);