From patchwork Mon Aug 7 11:09:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13344007 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 27E57C001DF for ; Mon, 7 Aug 2023 11:48:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230050AbjHGLsT (ORCPT ); Mon, 7 Aug 2023 07:48:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233185AbjHGLsH (ORCPT ); Mon, 7 Aug 2023 07:48:07 -0400 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AB70210F1 for ; Mon, 7 Aug 2023 04:47:37 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id 41be03b00d2f7-564670fad4bso396174a12.1 for ; Mon, 07 Aug 2023 04:47:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1691408857; x=1692013657; 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=8Rfav5Nxe+GtybemfHCRLQWJ1Wm1Jr8phC3oTaQ6f/s=; b=TwgZvVtvA8xJDzNFK49c3BQ6e/ulQWI7AEKX+LtR+W/9ox5bPKq5Kd/Af6K5hJ2cbT JtPMA51wsTwQUjk6WeZw+ODPpPZy6+vnsj0OfYYEvd3kksiKL6KE6Kd3OFIAlHSF8jdt wCDfhau2KAsxIqNIxL8ulZ3K5LohIoGfETqoM2TMnwXCWPIuOIgGYJI2u+QylBid/+9G ECclriHGiVtKLWTIRwBcbqnluZinFQgAkts23A+Sbv9YIhC94oF6JVpFme7wKIGXgEWI J3jIQBG8cjJxK2kua6eaA2Ya1My5BNMNrWMz0xqcnia9Meja1D/77/5evH5BavIgL9wb xHdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691408857; x=1692013657; 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=8Rfav5Nxe+GtybemfHCRLQWJ1Wm1Jr8phC3oTaQ6f/s=; b=BwICJnT/TXDVytPaNWwnUAoMApDNb6panDZSUzXs0Nmi8LKy3cOBb1BgD//cRSjAXI U5rPXSyDwm1vJXhGUNmu9RS90iTfAjyCU4bYZQ3kK7MZ0X7tPU354zRcum6HAhpZS3od MKvmDTdmNkOu8acb4yLWZDmhV8JNF7KEW2jxfBiJZqjOZ7qDRxU0caRsVr/Emv1woumZ wkoXx4YiO3udx52L0hM3zyLvhckmYwUiv5Lg+EJiL7KTblOMpFR5qSghxOjIRo2lz7nB 1TBVpfnzpAdHLek9SV7ExBp5qXYKZaafg+nqTpyV1xguLAoGyBgPu+2s3N+badrDFdib +Kgg== X-Gm-Message-State: ABy/qLazJYNoMxULXle0LyyDRGkgp4cQxH8SmV13ZwXqbm24KW/mkTgV 91qghTtzyoL3nJz6ULbc3PBrj9FiPa6YXrTrc5g= X-Google-Smtp-Source: AGHT+IFWvaKty2qg3Zp4xukmaRzjC+XhBT002dXZP422OqSqCh0qrR2HTT2eLu1rJ18Y9R5+7t84vA== X-Received: by 2002:a92:6408:0:b0:349:5c87:e712 with SMTP id y8-20020a926408000000b003495c87e712mr5356429ilb.1.1691406930655; Mon, 07 Aug 2023 04:15:30 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id y13-20020a17090aca8d00b0025be7b69d73sm5861191pjt.12.2023.08.07.04.15.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Aug 2023 04:15:30 -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, simon.horman@corigine.com, dlemoal@kernel.org 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 v4 26/48] dm: dynamically allocate the dm-bufio shrinker Date: Mon, 7 Aug 2023 19:09:14 +0800 Message-Id: <20230807110936.21819-27-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230807110936.21819-1-zhengqi.arch@bytedance.com> References: <20230807110936.21819-1-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 | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index bc309e41d074..62eb27639c9b 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); @@ -2490,14 +2490,20 @@ 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) { + r = -ENOMEM; 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++; @@ -2537,7 +2543,7 @@ 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);