From patchwork Mon Aug 7 11:09:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13343918 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 85510C001B0 for ; Mon, 7 Aug 2023 11:35:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232887AbjHGLfA (ORCPT ); Mon, 7 Aug 2023 07:35:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41084 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231415AbjHGLeh (ORCPT ); Mon, 7 Aug 2023 07:34:37 -0400 Received: from mail-oa1-x34.google.com (mail-oa1-x34.google.com [IPv6:2001:4860:4864:20::34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA75459EC for ; Mon, 7 Aug 2023 04:31:29 -0700 (PDT) Received: by mail-oa1-x34.google.com with SMTP id 586e51a60fabf-1bf162511e9so987530fac.1 for ; Mon, 07 Aug 2023 04:31:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1691407837; x=1692012637; 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=EIUP2Z+Njo4a1BEj4icZmHsMWaHOvZz2gypuwwXx0Do=; b=gVaARqTz66u+NUtKtZ7YGr8TD1Xwf63aiCQEOXTZstGVXt83PgCWyHi8nHOJu09Kk5 QWhfTOD4mZDA7jHhgtK/mlFpViI7AYx5uxoKaGlHUyLKA3qN1W83Pj6lsUNYd4FlezdT 8teuuiOT+W5t/5UeSzhYwRPmLT94UE6yCK1R8g7623+8rVFfdHIykyCTLqxDKgh3RojL DbTKyhfz28GUWPY77OVVGllplkWhFgQUxq3/0jFVMFpG5cBISAg0dkNckLTAUQ7ivsfB z9DkedlguRa29yBRx4Q74w0ug6lzHWURRtcp83rB0SN/V8r3BirKsH6s890DStKKD2hM AiTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691407837; x=1692012637; 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=EIUP2Z+Njo4a1BEj4icZmHsMWaHOvZz2gypuwwXx0Do=; b=Fgb3yzXoMN+9XT/CW2Mw7pDp9oAd3KF0oE29ps029Bd9FcTVEUxv6BFBACrRdppk8b pccTsyqG8B3z5QjFpGzhqx443cE/1wjgQEwL052HH1V41gZbsTiSssdv/3k2VpCLk+/+ yb3Jklhwz36QSJlz+Pj8zuKjMeqLcqTuFL4ejAwgY9S+yBrHcV4/tYz9f0CJUACofTo2 4FwP+/2+ZP4Ad7sAcag6vsaYKG9O+JDrPGVT6bL4SZRn3m1L4tbgNNgmNWg0pmBvBnnr zU3bok+LRIgNvJMLmf5lK8aVzFc09SEWC2Vw5LAqfDO2AJrvAzdQzXH/7ZdJ2aVuyQts oCtw== X-Gm-Message-State: ABy/qLbItG5MYmtjParwto1rrslYg9pUnc4eh1TaGGc4qnn5694HG3sb 9bKk4TXAD6I63qvy3OFKQXCqwaoP+StQlNoa3rs= X-Google-Smtp-Source: AGHT+IGL/1gBIk2C+QwkMNr6hEGRZG4q+xpVeUoXNA4D2kibZqrKnrVjY0bqX283iYX9eWQrJAN/xA== X-Received: by 2002:a17:90a:6701:b0:269:32c7:24dc with SMTP id n1-20020a17090a670100b0026932c724dcmr6036278pjj.0.1691407020016; Mon, 07 Aug 2023 04:17:00 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id y13-20020a17090aca8d00b0025be7b69d73sm5861191pjt.12.2023.08.07.04.16.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Aug 2023 04:16:59 -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 33/48] ext4: dynamically allocate the ext4-es shrinker Date: Mon, 7 Aug 2023 19:09:21 +0800 Message-Id: <20230807110936.21819-34-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 ext4-es 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 ext4_sb_info. Signed-off-by: Qi Zheng Reviewed-by: Muchun Song --- fs/ext4/ext4.h | 2 +- fs/ext4/extents_status.c | 24 ++++++++++++++---------- 2 files changed, 15 insertions(+), 11 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 481491e892df..48baf03eb1a6 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1657,7 +1657,7 @@ struct ext4_sb_info { __u32 s_csum_seed; /* Reclaim extents from extent status tree */ - struct shrinker s_es_shrinker; + struct shrinker *s_es_shrinker; struct list_head s_es_list; /* List of inodes with reclaimable extents */ long s_es_nr_inode; struct ext4_es_stats s_es_stats; diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c index 9b5b8951afb4..0532a81a7669 100644 --- a/fs/ext4/extents_status.c +++ b/fs/ext4/extents_status.c @@ -1596,7 +1596,7 @@ static unsigned long ext4_es_count(struct shrinker *shrink, unsigned long nr; struct ext4_sb_info *sbi; - sbi = container_of(shrink, struct ext4_sb_info, s_es_shrinker); + sbi = shrink->private_data; nr = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_shk_cnt); trace_ext4_es_shrink_count(sbi->s_sb, sc->nr_to_scan, nr); return nr; @@ -1605,8 +1605,7 @@ static unsigned long ext4_es_count(struct shrinker *shrink, static unsigned long ext4_es_scan(struct shrinker *shrink, struct shrink_control *sc) { - struct ext4_sb_info *sbi = container_of(shrink, - struct ext4_sb_info, s_es_shrinker); + struct ext4_sb_info *sbi = shrink->private_data; int nr_to_scan = sc->nr_to_scan; int ret, nr_shrunk; @@ -1690,13 +1689,18 @@ int ext4_es_register_shrinker(struct ext4_sb_info *sbi) if (err) goto err3; - sbi->s_es_shrinker.scan_objects = ext4_es_scan; - sbi->s_es_shrinker.count_objects = ext4_es_count; - sbi->s_es_shrinker.seeks = DEFAULT_SEEKS; - err = register_shrinker(&sbi->s_es_shrinker, "ext4-es:%s", - sbi->s_sb->s_id); - if (err) + sbi->s_es_shrinker = shrinker_alloc(0, "ext4-es:%s", sbi->s_sb->s_id); + if (!sbi->s_es_shrinker) { + err = -ENOMEM; goto err4; + } + + sbi->s_es_shrinker->scan_objects = ext4_es_scan; + sbi->s_es_shrinker->count_objects = ext4_es_count; + sbi->s_es_shrinker->seeks = DEFAULT_SEEKS; + sbi->s_es_shrinker->private_data = sbi; + + shrinker_register(sbi->s_es_shrinker); return 0; err4: @@ -1716,7 +1720,7 @@ void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi) percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_misses); percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt); percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt); - unregister_shrinker(&sbi->s_es_shrinker); + shrinker_free(sbi->s_es_shrinker); } /*