From patchwork Thu Jul 27 08:04:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13329580 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 C7FA3C04FE0 for ; Thu, 27 Jul 2023 08:22:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234161AbjG0IWl (ORCPT ); Thu, 27 Jul 2023 04:22:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232997AbjG0IUZ (ORCPT ); Thu, 27 Jul 2023 04:20:25 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 22ADF7ABD for ; Thu, 27 Jul 2023 01:12:33 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-686f6231bdeso113485b3a.1 for ; Thu, 27 Jul 2023 01:12:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690445502; x=1691050302; 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=LaFX3BwmrpvhCQ7689MuoFj6fWFWMuerWJZNZNxWVVc=; b=SGV84iDT12fuj4KQ/vgxpHx68bD/8JsYSa9nhb7ntFAq0TKpEUCTaHREzmRsJ3Oz9G gFKmoptXd+Bze48vx/wk2NbZ7T10E7S2MEqYjOuFeG7krpKwSKpfVHBIQRglXfDWTvzO H6VjPKPaTyQraf7CXaxRYntDfW/rFmDGA8pIc8wp3mkyDCZKtDmTVn+WhnbJ9UTHRuGw cfWrmdeiaPvvoPdILYK4+expmzf+8d5vjjDAS5qG8jY/gHHW1jvZoSyULsapwlJ7yOSa R+fxk2s2E87YRuuXF3DsPLATcyScHTHvPiXBlY0TGTmF0pFa842v0dWDdf9orTc8Pn3s TgHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690445502; x=1691050302; 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=LaFX3BwmrpvhCQ7689MuoFj6fWFWMuerWJZNZNxWVVc=; b=NLmyE27OHo4Mc7gTdWpbX/+vLUMlYODSSSlG4jA+4G/0oftgHn6DGpJNhKMOa5u8FW oG7L/ZIkQ9xsq33n8Idwz9Ytcw/ymVIqTPE4kLCoBQgWtfLXtqniyb2hJqPnp3XuDQP1 KkkEcFDraLfULeZpAfZDMj3QtRxxFM6YsZO8FHti0hTvVF2eHFDqwU6Rayug7UpfZ7Hf SzQqgiJ0+MeW0zCgV0av0rkrHv9ckiv/L24ukz2yLqx+65hj7UiPsIYdeJSszjplXRCr Frb7ge6bfCRj3MysZbaN9kJgmF8YMXHgdy5mFCcY1lJT4Wf/jP6XPEL3iL7fAZGTbzZ9 uvaA== X-Gm-Message-State: ABy/qLaA5x3RlqrD8IYHbbTha+gTIHWbJQPRgHe+oKj9keAWbF+f7S// mIpsse+5YjU0bfl0I4JKV1Pipw== X-Google-Smtp-Source: APBJJlE5krPFtX55mdmbm5NUPWWjP9qjtSRaT4qUAQtTa6jtnXVyWfbzlnq9LXdP1SlmgTnMsVycpA== X-Received: by 2002:a05:6a21:78a8:b0:137:3eba:b81f with SMTP id bf40-20020a056a2178a800b001373ebab81fmr6016028pzc.3.1690445502183; Thu, 27 Jul 2023 01:11:42 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id j8-20020aa78d08000000b006828e49c04csm885872pfe.75.2023.07.27.01.11.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jul 2023 01:11:41 -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 29/49] md/raid5: dynamically allocate the md-raid5 shrinker Date: Thu, 27 Jul 2023 16:04:42 +0800 Message-Id: <20230727080502.77895-30-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: rcu@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..fbb4e6f5ff43 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_free(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;