From patchwork Thu Jun 22 08:53:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 695846 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 272D1EB64DB for ; Thu, 22 Jun 2023 08:59:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231702AbjFVI7d (ORCPT ); Thu, 22 Jun 2023 04:59:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42370 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231258AbjFVI6r (ORCPT ); Thu, 22 Jun 2023 04:58:47 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 652DA268A for ; Thu, 22 Jun 2023 01:55:49 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id 41be03b00d2f7-54f73ef19e5so678879a12.0 for ; Thu, 22 Jun 2023 01:55:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1687424148; x=1690016148; 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=eFTuD75yazkbkprx1nDK+J2a+gsKcpdTH5uLLFxlsCE=; b=YL01pLqxeJdJ3yx7vlwGwrScHLp900A8hEE3Wf+RWJNlhx4L8kHsp9yLDKLvMKBCnC 3rsy/Bt3MovGZd9xDykjB2GgcKTKrjV0UKR/p/LUcqeAgCcK1oeyqL4lKiu0nVi2NGBN TaYF2c0QLLlLRjtauaahzpKEMrC5bmEQ14igH5gpZVZzZ5PZmJEXxyLsPSab+WZLJtP7 soRQ7v+HKrW5nh3UOzeGEOAr+30lPAAddvMLxo2KnZ7MK/KtFrltdlmvaznhvWw7dzRl oronsxPEPE0DLPq3etiyjPQ96cDhygWHhtXaurPBhnnq3MU+faq6ga287Qti+jNFsnPy uaEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687424148; x=1690016148; 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=eFTuD75yazkbkprx1nDK+J2a+gsKcpdTH5uLLFxlsCE=; b=bh2Zlf50j3cXw6pkHi0cyf4bdUjSV4HlBPUH9/JZOFTOL84rACZMiKgDEDqUIB3Cbt Chi6ezSubhNucmMZG8C3sueKcNINYSqW/MbZN4w2KjmOmhzMEbZrtPBZBaUVgMTbSeCT 4WseJ6q2TKXoNlu0bmNbojJArkC5yLeeJ4WiSMyuSAERxXaN6rclFwfBSTh80Gafp8lB wXK73hAu1kPK0GT2pUu0IX9kQY6E6E7SVqdtCdXKunY2oiUfwKt7wdL01zPtKMtH8qFb tiYRLjITcidp2jAR1wZF38WMp36eKkdxOpWHqFTc1mmi3FPNQZoY7SMxXh1bnrO/J6c7 mH9A== X-Gm-Message-State: AC+VfDzd15ajC6uflbMael66OBUGld6OG2BsztqHpWT68H1DLpe+VyN0 ZdEE1kdsD2oVyODETSu8NlNW4A== X-Google-Smtp-Source: ACHHUZ6jVuCzKKZsdSS1vKWkjhi+wc7lz2Kfe1cJ6l4zUout3MX707Lbn9nWcxBb7Ur8w7srUJ3z+g== X-Received: by 2002:a17:903:2451:b0:1b0:34c6:3bf2 with SMTP id l17-20020a170903245100b001b034c63bf2mr21540496pls.5.1687424148210; Thu, 22 Jun 2023 01:55:48 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id h2-20020a170902f7c200b001b549fce345sm4806971plw.230.2023.06.22.01.55.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jun 2023 01:55:47 -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 13/29] ext4: dynamically allocate the ext4-es shrinker Date: Thu, 22 Jun 2023 16:53:19 +0800 Message-Id: <20230622085335.77010-14-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-arm-msm@vger.kernel.org In preparation for implementing lockless slab shrink, we need 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 --- fs/ext4/ext4.h | 2 +- fs/ext4/extents_status.c | 21 ++++++++++++--------- 2 files changed, 13 insertions(+), 10 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 0a2d55faa095..1bd150d454f5 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1651,7 +1651,7 @@ 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..fea82339f4b4 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; @@ -1690,15 +1689,19 @@ 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_es_shrinker = shrinker_alloc_and_init(ext4_es_count, ext4_es_scan, + 0, DEFAULT_SEEKS, 0, sbi); + if (!sbi->s_es_shrinker) + goto err4; + + err = register_shrinker(sbi->s_es_shrinker, "ext4-es:%s", sbi->s_sb->s_id); if (err) - goto err4; + goto err5; return 0; +err5: + shrinker_free(sbi->s_es_shrinker); err4: percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt); err3: @@ -1716,7 +1719,7 @@ 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); + unregister_and_free_shrinker(sbi->s_es_shrinker); } /*