From patchwork Mon Jul 24 09:43:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13324074 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 9CEFCC001DF for ; Mon, 24 Jul 2023 09:56:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232798AbjGXJ4t (ORCPT ); Mon, 24 Jul 2023 05:56:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52898 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232619AbjGXJ42 (ORCPT ); Mon, 24 Jul 2023 05:56:28 -0400 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A0D0E6C for ; Mon, 24 Jul 2023 02:51:13 -0700 (PDT) Received: by mail-pj1-x102f.google.com with SMTP id 98e67ed59e1d1-2659b1113c2so536276a91.1 for ; Mon, 24 Jul 2023 02:51:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690192230; x=1690797030; 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=h5Pgz5o85vjRJX2NAYGHXGIfrVWxEYXMNean3UujJOE=; b=HTXrSeoRNfCylQUvp3rA93XfC5B9ZAm1jE2rq6Hxhf34WiOMuxDD1meCGjwu9EwIX7 ZbtHbS4fRmsyA8f1AQ95KeA8pk2Wu8dqsEYadFuPM8kR0aC/DghUlOU1O4pFRVVN27md Jz3ZRGJgXj2574vm45/AlAwiQEEVW+fNcrUB9gqDXxsp5xfvZzaaREkRLWgNT154mbaN kLE4oZiRvqBvE8wXvErAyC7133TniCzwa8RrEDkzsepAqin0to9X/dlSZmLYhsSlZCfb 1LIBzBngTPhlUQBluPspeHfucBGL5ud/FkBEqD4eyTXeqLx9y9KdZjNraR8njMzNn3Wl 0XdQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690192230; x=1690797030; 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=h5Pgz5o85vjRJX2NAYGHXGIfrVWxEYXMNean3UujJOE=; b=Ph3e3sslsImOfkO3AO2A0L+wLBzbqp/D3zjJqTBfLlTPsyIca4hUtQWyz3cPat5qN7 QZjjs/iFMYaEi0cWTcAV+7cZLGhFRlgScXd+2prLm3REoqgCSJ7zIqVFpd1kEI0dycrD zShHxzA+Eg6W/RKDyks0UcF2c80oNjLKe8bVgUumxzlOFemiAZjYhsSuuWVHGFVadzPY O6OjwTZMQWm0uB3G7qYiCB68of/kTJ2CEgjahROBcbvxPPU4SYKApoUd0QaAoED+A5Oe n1G1gNZz95O5qT3RNPNjsVuhUu0OvDA18/358YwvNEVOwHa5+1F9tEQ0zWluNbeBA4hu vV0w== X-Gm-Message-State: ABy/qLaTbgCDwu7CFrJsQR5e5nSxdP3wrcUSpybAjWOLQ5PNOSvUj09N iah9ss5l/917Il/dnb4NyW4Ekw== X-Google-Smtp-Source: APBJJlEuFsN94AIprk7ia8ABwlM0Slt2XXWIAtSq+6lqm1qdEZFYXWzDVMuJVyeP2h9BJXp/48ZO1g== X-Received: by 2002:a17:90a:5a4c:b0:263:1e82:2dc7 with SMTP id m12-20020a17090a5a4c00b002631e822dc7mr8465919pji.0.1690192230524; Mon, 24 Jul 2023 02:50:30 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id d5-20020a170902c18500b001bb20380bf2sm8467233pld.13.2023.07.24.02.50.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jul 2023 02:50:30 -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 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 27/47] md/raid5: dynamically allocate the md-raid5 shrinker Date: Mon, 24 Jul 2023 17:43:34 +0800 Message-Id: <20230724094354.90817-28-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: linux-btrfs@vger.kernel.org In preparation for implementing lockless slab shrink, use new APIs 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 Reviewed-by: Muchun Song --- drivers/md/raid5.c | 25 ++++++++++++++----------- drivers/md/raid5.h | 2 +- 2 files changed, 15 insertions(+), 12 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 85b3004594e0..12443dfb7aeb 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -7414,7 +7414,7 @@ static void free_conf(struct r5conf *conf) log_exit(conf); - unregister_shrinker(&conf->shrinker); + shrinker_unregister(conf->shrinker); free_thread_groups(conf); shrink_stripes(conf); raid5_free_percpu(conf); @@ -7462,7 +7462,7 @@ 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)) { @@ -7483,7 +7483,7 @@ 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 */ @@ -7718,18 +7718,21 @@ 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)); - if (ret) { - pr_warn("md/raid:%s: couldn't register shrinker.\n", + conf->shrinker = shrinker_alloc(0, "md-raid5:%s", mdname(mddev)); + if (!conf->shrinker) { + pr_warn("md/raid:%s: couldn't allocate shrinker.\n", mdname(mddev)); goto abort; } + 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->private_data = conf; + + shrinker_register(conf->shrinker); + sprintf(pers_name, "raid%d", mddev->new_level); rcu_assign_pointer(conf->thread, md_register_thread(raid5d, mddev, pers_name)); diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 97a795979a35..22bea20eccbd 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;