From patchwork Thu Jul 27 08:04:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13329588 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 E979EC04FDF for ; Thu, 27 Jul 2023 08:21:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234026AbjG0IVq (ORCPT ); Thu, 27 Jul 2023 04:21:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234581AbjG0ITo (ORCPT ); Thu, 27 Jul 2023 04:19:44 -0400 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1B8F768C for ; Thu, 27 Jul 2023 01:11:49 -0700 (PDT) Received: by mail-pf1-x42f.google.com with SMTP id d2e1a72fcca58-686f74a8992so78044b3a.1 for ; Thu, 27 Jul 2023 01:11:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690445477; x=1691050277; 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=/uDURfJnJhgp6SdQN0dR835bsVpn4QFEXgmrOE/fnW4=; b=XMYYvlyXrTmu7TBUMUrS0fAERGM3ULbRWCn4in2BRNinhRwId1ryL35VoKr2h4Rx+U HjLlRWIKGbBKN0lkokdfiXe7DL4/cW8JhUixM/OhO46u6zDYby/ZSHvD4zMfuAy6v0wa kMUIVYEZOCmoajTRWB9O5pPKf2KXDL1RA9QX/iWGDKdd+7AiEQpaXll5+7XF5hXMtboW QGfdfOEZoiLr6B07ra4S8ESol/cU0lfuHqis0vxsY6ajpZNCyt33YYUETwhkXmLJyVVM wWI0H3b2jkyty5FrIH3eGt0u2K+zpCq6JQc2FhUeW7es/kOOMNTlHxQiuG1Uqt5RUvfA 07oA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690445477; x=1691050277; 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=/uDURfJnJhgp6SdQN0dR835bsVpn4QFEXgmrOE/fnW4=; b=iRLo/8l8WmVrrD2l6Kjayxz9M4+Mtyi+G2ZNcBZlM9/MlMr1U5F55YvwLxYpb1M4mI /dsfJkMokJB0qhE1tt1lVH1dF4n+VGTgsoxWZvSpvV7NcqxBbg66bxjUT/1odHjJjOo5 P9bLncNT1vWXT8aAPF/9TCK6QCSfgjd+7hsl6wIlCxCrcWobL6B2kj+RZTJYJJQP8Jk4 XIA9nzohr4X6pYdD+sujpfSJ9ISM2gRnoP2+w/4EXnVIojTiJZT1JKiT7vj9WrbisjvZ HmsU8S/1OX1DUqDkAFphdhG0nJyiaXaltj73Nj4qAb8H4btchVKJ0dXaahZ5+XKFDoXq g4LA== X-Gm-Message-State: ABy/qLbdHgwmkY5GeRwMB28uiIOkYLwIcsS+C8e0oC6IJDJbk4o4yATh R/Cs7nHXMesnqQDOElH6eygbAg== X-Google-Smtp-Source: APBJJlG87NINI+/+i4SJ1KgSTM1EJ+JwVd/Dy5o7cICQ6coQ1cuBExOC2izM/xbO/Jy48XOYsOKRHA== X-Received: by 2002:a05:6a00:2b90:b0:67d:308b:97ef with SMTP id dv16-20020a056a002b9000b0067d308b97efmr4590349pfb.2.1690445477689; Thu, 27 Jul 2023 01:11:17 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id j8-20020aa78d08000000b006828e49c04csm885872pfe.75.2023.07.27.01.11.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jul 2023 01:11:17 -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 , Muchun Song Subject: [PATCH v3 27/49] dm: dynamically allocate the dm-bufio shrinker Date: Thu, 27 Jul 2023 16:04:40 +0800 Message-Id: <20230727080502.77895-28-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230727080502.77895-1-zhengqi.arch@bytedance.com> References: <20230727080502.77895-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-raid@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..5a9124b83d53 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_free(c->shrinker); flush_work(&c->shrink_work); mutex_lock(&dm_bufio_clients_lock);