From nobody Tue Dec 16 21:50:01 2025 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 B2719C71153 for ; Thu, 24 Aug 2023 03:51:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239925AbjHXDu4 (ORCPT ); Wed, 23 Aug 2023 23:50:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45098 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240029AbjHXDtc (ORCPT ); Wed, 23 Aug 2023 23:49:32 -0400 Received: from mail-oi1-x229.google.com (mail-oi1-x229.google.com [IPv6:2607:f8b0:4864:20::229]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B26731FF3 for ; Wed, 23 Aug 2023 20:48:16 -0700 (PDT) Received: by mail-oi1-x229.google.com with SMTP id 5614622812f47-3a8586813cfso655745b6e.0 for ; Wed, 23 Aug 2023 20:48:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1692848895; x=1693453695; 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=cCUdhxTNgYopmfrUvm5tWP9/UPIt4enx1ZSflKLoeW0=; b=kvKgrGQv1mYZZS4wF3iCkRztwK2mmzphcIiXW0hKBcBmpcBvr4ErwgCDxT0L2eW0Zv DJtsfJPfQXVQjgbnZU8cUPbTUerpeh1mFrxeeqphvRnfm0XvYoY6wkXj976IEu2KPv8M UY81aGvh1S2CZkAubHr77TRlgVTQj3S+O6bIip73XKRxSzJ3mZvjOtnJ5IA9wdPa4ZiS bWHD8dtc86fBmv8R6Lmll8JjHXVoefuawXEuLIf69c5aeNKZ5HFce3zJFQbqcfZDtHTW 00qh3ZW5H0/jsYXIB/RBrVJBng/341ReHz9UooUbIAK8ltPn7oPpr+d+F95I3H7EoQOD 4xOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692848895; x=1693453695; 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=cCUdhxTNgYopmfrUvm5tWP9/UPIt4enx1ZSflKLoeW0=; b=NgrqGMR0cTQcdICkBA8X3DB3tJTr6BB5pESBhluLcMiCjUNXnu9Ac1zSw7FnkY2Qfb ywr71myo7dcKbgXCS8J+99MR3e0aIM5krihwLkiBkkEPIx3fUu66rfk9Y86NqOIBCKhP gtXu/abRJI1ed45EODtXpN0jJGv2wyEupR0fRtANLaF9Lxpd5UzwMHrmY3XGGitsDHJq hmflf/oUkYaP8NC33ULiCfGkGe/J2i5lRFcLR7d+Us3piOSKhd5CkGpswJjukeSKAwkn SAnXXQ180vOlvO3FCAzdNLWoFcLJj+6HSVCOgSUYpwREK6fK2r4jPYGeJx0dgSfsj9Sg EnYQ== X-Gm-Message-State: AOJu0Yxz0X2Cx6gDZYICwEejLgbxxZZymkvVFR/+LN8sJxgyTmSw/yKA sUpm0SwcSwnLZV7MHOdeAE7zQw== X-Google-Smtp-Source: AGHT+IH2JbF6bibig8NYJYSBcTW5xuf5z4s3TwsXtyBJWRygTdPzsu3RVfUJVPK/hAkIo2xRy+AgMQ== X-Received: by 2002:a05:6808:180a:b0:3a7:8e1b:9d4f with SMTP id bh10-20020a056808180a00b003a78e1b9d4fmr16979066oib.3.1692848895236; Wed, 23 Aug 2023 20:48:15 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id t6-20020a63b246000000b005579f12a238sm10533157pgo.86.2023.08.23.20.48.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Aug 2023 20:48:14 -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, linux-fsdevel@vger.kernel.org, Qi Zheng , Muchun Song , Andreas Dilger , linux-ext4@vger.kernel.org Subject: [PATCH v5 30/45] ext4: dynamically allocate the ext4-es shrinker Date: Thu, 24 Aug 2023 11:42:49 +0800 Message-Id: <20230824034304.37411-31-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230824034304.37411-1-zhengqi.arch@bytedance.com> References: <20230824034304.37411-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In preparation for implementing lockless slab shrink, use new APIs to dynamically allocate the ext4-es shrinker, so that it can be freed asynchronously via 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 CC: "Theodore Ts'o" CC: Andreas Dilger CC: linux-ext4@vger.kernel.org --- 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 e5055eac42f6..353a7fcd609a 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1653,7 +1653,7 @@ struct ext4_sb_info { __u32 s_csum_seed; =20 /* 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 *s= hrink, unsigned long nr; struct ext4_sb_info *sbi; =20 - sbi =3D container_of(shrink, struct ext4_sb_info, s_es_shrinker); + sbi =3D shrink->private_data; nr =3D 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 *s= hrink, static unsigned long ext4_es_scan(struct shrinker *shrink, struct shrink_control *sc) { - struct ext4_sb_info *sbi =3D container_of(shrink, - struct ext4_sb_info, s_es_shrinker); + struct ext4_sb_info *sbi =3D shrink->private_data; int nr_to_scan =3D sc->nr_to_scan; int ret, nr_shrunk; =20 @@ -1690,13 +1689,18 @@ int ext4_es_register_shrinker(struct ext4_sb_info *= sbi) if (err) goto err3; =20 - sbi->s_es_shrinker.scan_objects =3D ext4_es_scan; - sbi->s_es_shrinker.count_objects =3D ext4_es_count; - sbi->s_es_shrinker.seeks =3D DEFAULT_SEEKS; - err =3D register_shrinker(&sbi->s_es_shrinker, "ext4-es:%s", - sbi->s_sb->s_id); - if (err) + sbi->s_es_shrinker =3D shrinker_alloc(0, "ext4-es:%s", sbi->s_sb->s_id); + if (!sbi->s_es_shrinker) { + err =3D -ENOMEM; goto err4; + } + + sbi->s_es_shrinker->scan_objects =3D ext4_es_scan; + sbi->s_es_shrinker->count_objects =3D ext4_es_count; + sbi->s_es_shrinker->seeks =3D DEFAULT_SEEKS; + sbi->s_es_shrinker->private_data =3D sbi; + + shrinker_register(sbi->s_es_shrinker); =20 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); } =20 /* --=20 2.30.2