From patchwork Thu Jun 22 08:53:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13288639 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 0CD34EB64DD for ; Thu, 22 Jun 2023 08:57:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231549AbjFVI5p (ORCPT ); Thu, 22 Jun 2023 04:57:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37098 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231538AbjFVIzj (ORCPT ); Thu, 22 Jun 2023 04:55:39 -0400 Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6D14F2123 for ; Thu, 22 Jun 2023 01:55:07 -0700 (PDT) Received: by mail-pf1-x42e.google.com with SMTP id d2e1a72fcca58-6664ac3be47so1328500b3a.0 for ; Thu, 22 Jun 2023 01:55:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1687424107; x=1690016107; 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=VJl14vOz0XQFz+azMteX8g8XWQLmhD27loPyzQxCyWo=; b=dSY63dBGkLY8Soj8dXVS98dEuYYMZ3kYNqwn6f5//glPXLQFLJz27NFKmb5CQWTM2k APxbCFally5Ye2wcKhRjXEzkXpY2MMujAr7sHxpWVpY6Tw+UW8TdBughq+A6CDzAWoWy +AmwZXYTUtj1EVbssFnJPqE+UVXszSk7I45NYzxDje6ZfgHjeGWZHMg6aUv73LqWwWwW 5itKACc99wkxtDt6xsJWBL2urtctKzIlWYA5VnKnCf1Z8lrwitknq6fV+Y7yJzzApX1O ankK3WiQYH84OGQwTOkmZRg+avhtQPcT8KVvO5N8KslMNgzr0qkBoxHulDKJPx12AE+X /x4Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687424107; x=1690016107; 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=VJl14vOz0XQFz+azMteX8g8XWQLmhD27loPyzQxCyWo=; b=B3HizCCGda802MUL4uzxj2qLVDMjryDk1P3/9vzj5mWhpd4bbXajDq/sNVcFzDodBd H0jzoPGdGx6UpUA2fw89I8FPaE9grUwBt9ApkDmYVlmkaTDr8hwCiZRHN4/aG3bjHYdz vNajmX4lR17VQMxxLFGcFmDnTw5N8hG0BAZzYWDZUA7umDzlaNv5XMWhT6rg1yYJdHn7 DVLWiTVCp6PjTUigQxzM7rAWAeMEWJ95spWQcNRS1L4QKR1YcyJ7FdV7CqIqN/HZURjv UdnAQmlB/BmVXtpxgx9PDgZCJYI5Y7emcp2uKrRtFzfaht5GgoopXKo/zTWz1gsCM5tL GODg== X-Gm-Message-State: AC+VfDwOSYP1Js5H0TMnAsWI7KOkQNjeSjBdMNephOwTu1RT628qCTQL jkXA4fHVftmvHfGbatI9bhL4sA== X-Google-Smtp-Source: ACHHUZ4GugeqE/IaG8xLwh4Bzf5woebFV8d7i9CEhVh9D6pBJJ8ySrAWkjhYmHqxBxnT9m8efiqyXQ== X-Received: by 2002:a17:902:c945:b0:1ac:40f7:8b5a with SMTP id i5-20020a170902c94500b001ac40f78b5amr21000858pla.3.1687424106926; Thu, 22 Jun 2023 01:55:06 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id h2-20020a170902f7c200b001b549fce345sm4806971plw.230.2023.06.22.01.54.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jun 2023 01:55:06 -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 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 08/29] md/raid5: dynamically allocate the md-raid5 shrinker Date: Thu, 22 Jun 2023 16:53:14 +0800 Message-Id: <20230622085335.77010-9-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 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org In preparation for implementing lockless slab shrink, we need to dynamically allocate the md-raid5 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 r5conf. Signed-off-by: Qi Zheng --- drivers/md/raid5.c | 28 +++++++++++++++++----------- drivers/md/raid5.h | 2 +- 2 files changed, 18 insertions(+), 12 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index f4eea1bbbeaf..4866cad1ad62 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -7391,7 +7391,7 @@ static void free_conf(struct r5conf *conf) log_exit(conf); - unregister_shrinker(&conf->shrinker); + unregister_and_free_shrinker(conf->shrinker); free_thread_groups(conf); shrink_stripes(conf); raid5_free_percpu(conf); @@ -7439,7 +7439,7 @@ static int raid5_alloc_percpu(struct r5conf *conf) static unsigned long raid5_cache_scan(struct shrinker *shrink, struct shrink_control *sc) { - struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); + struct r5conf *conf = shrink->private_data; unsigned long ret = SHRINK_STOP; if (mutex_trylock(&conf->cache_size_mutex)) { @@ -7460,7 +7460,7 @@ static unsigned long raid5_cache_scan(struct shrinker *shrink, static unsigned long raid5_cache_count(struct shrinker *shrink, struct shrink_control *sc) { - struct r5conf *conf = container_of(shrink, struct r5conf, shrinker); + struct r5conf *conf = shrink->private_data; if (conf->max_nr_stripes < conf->min_nr_stripes) /* unlikely, but not impossible */ @@ -7695,16 +7695,21 @@ static struct r5conf *setup_conf(struct mddev *mddev) * it reduces the queue depth and so can hurt throughput. * So set it rather large, scaled by number of devices. */ - conf->shrinker.seeks = DEFAULT_SEEKS * conf->raid_disks * 4; - conf->shrinker.scan_objects = raid5_cache_scan; - conf->shrinker.count_objects = raid5_cache_count; - conf->shrinker.batch = 128; - conf->shrinker.flags = 0; - ret = register_shrinker(&conf->shrinker, "md-raid5:%s", mdname(mddev)); + conf->shrinker = shrinker_alloc_and_init(raid5_cache_count, + raid5_cache_scan, 128, + DEFAULT_SEEKS * conf->raid_disks * 4, + 0, conf); + if (!conf->shrinker) { + pr_warn("md/raid:%s: couldn't allocate shrinker.\n", + mdname(mddev)); + goto abort; + } + + ret = register_shrinker(conf->shrinker, "md-raid5:%s", mdname(mddev)); if (ret) { pr_warn("md/raid:%s: couldn't register shrinker.\n", mdname(mddev)); - goto abort; + goto abort_shrinker; } sprintf(pers_name, "raid%d", mddev->new_level); @@ -7717,7 +7722,8 @@ static struct r5conf *setup_conf(struct mddev *mddev) } return conf; - +abort_shrinker: + shrinker_free(conf->shrinker); abort: if (conf) free_conf(conf); diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 6a92fafb0748..806f84681599 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -670,7 +670,7 @@ struct r5conf { wait_queue_head_t wait_for_stripe; wait_queue_head_t wait_for_overlap; unsigned long cache_state; - struct shrinker shrinker; + struct shrinker *shrinker; int pool_size; /* number of disks in stripeheads in pool */ spinlock_t device_lock; struct disk_info *disks;