From nobody Thu Sep 11 22:30:20 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 9CCE6CA0EC3 for ; Mon, 11 Sep 2023 21:10:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239198AbjIKVET (ORCPT ); Mon, 11 Sep 2023 17:04:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235965AbjIKJr1 (ORCPT ); Mon, 11 Sep 2023 05:47:27 -0400 Received: from mail-pl1-x629.google.com (mail-pl1-x629.google.com [IPv6:2607:f8b0:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34C3E116 for ; Mon, 11 Sep 2023 02:47:23 -0700 (PDT) Received: by mail-pl1-x629.google.com with SMTP id d9443c01a7336-1c0efe0c4acso7086905ad.0 for ; Mon, 11 Sep 2023 02:47:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1694425642; x=1695030442; darn=vger.kernel.org; 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=nO5XG1oNP6pUjS3WN2+RrRDElLAKlnsgenuSaZhp694=; b=CwGNapEsGEKLOP1WtNH0uwIv9Lr9oKEL35X/KtieiyH9m5IoCCEMLpq2cAk5aBg9wa K5Ycps6CA2+bGZuUNVF93Vjtx1PyH2OyaHPcSMsfJfZ8XxVfhcmsHf4xVMkfLfjwtKGc /L3HcDLGW2qEUyYkyxNjql2X8XBxk4dW6MppiV+JNYEo2AwcB+DYWtFt4wWNmz2YLKYK 4UKN5C1e6q0tSUQxE0RQymndbGMCVN9sL4toX1mVbAht8dsRIhuFcF9IH47NvACTC/TY IEZxV2scnE31dCjQqTOjdN8Jk3KWmlzjeJeNyKqhUzZIf0nfDNXZEyjyc3t0XbE7GqbC DyPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694425642; x=1695030442; 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=nO5XG1oNP6pUjS3WN2+RrRDElLAKlnsgenuSaZhp694=; b=NfBWHmrz+wjS05hk2dq0l5SEgTCWe6iACrdkQq68qCGXaOX1YJR1mFkd6JHiIlRUL9 NGGj6XnLLfNyuDYGYTVCxZL8Mvoi5BrAcAORoK+l2eMoRTT7B1M5KOtIQQC6kDnY6hvm RoSOt8SLTcqvEh+IRxq0zAnf9mv8QBp0exU/xb4LfXVzM3R9kY6jKZoxRhMO0Y6/OY6O jbEWk03atZ5rHaBgCbW/eWvzynYeqrQKWZnDp9lSvLGtwEcIYigxUKC4q1WSqKINwVox d4UcVH6C8h3jE4YmZcS9cz8PtgIsKk+DULBbIif9K4/JbzDZuv4ilbUyGX1gNsccnMyP PuvA== X-Gm-Message-State: AOJu0YxOTBc/s8JVvMOh0HpbpnxB8ZP2JGKyl6lmlkGHOq54Q7gCGoDJ YSYvSHRzIg6rIkZIY6g60OWyBg== X-Google-Smtp-Source: AGHT+IGU0jWm5aUKgo65aoc1FmWqzP1rWPbNbFl1TEnUeGhWf2rII1K9xqSMkpAW8Vpnx3sOpXBIKg== X-Received: by 2002:a05:6a21:a594:b0:13e:1d49:7249 with SMTP id gd20-20020a056a21a59400b0013e1d497249mr13273426pzc.2.1694425642605; Mon, 11 Sep 2023 02:47:22 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id az7-20020a170902a58700b001bdc2fdcf7esm5988188plb.129.2023.09.11.02.47.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Sep 2023 02:47:22 -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 , Joel Fernandes , rcu@vger.kernel.org Subject: [PATCH v6 15/45] rcu: dynamically allocate the rcu-lazy shrinker Date: Mon, 11 Sep 2023 17:44:14 +0800 Message-Id: <20230911094444.68966-16-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230911094444.68966-1-zhengqi.arch@bytedance.com> References: <20230911094444.68966-1-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" Use new APIs to dynamically allocate the rcu-lazy shrinker. Signed-off-by: Qi Zheng Reviewed-by: Joel Fernandes (Google) CC: rcu@vger.kernel.org Acked-by: Muchun Song --- kernel/rcu/tree_nocb.h | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 5598212d1f27..4efbf7333d4e 100644 --- a/kernel/rcu/tree_nocb.h +++ b/kernel/rcu/tree_nocb.h @@ -1396,13 +1396,6 @@ lazy_rcu_shrink_scan(struct shrinker *shrink, struct= shrink_control *sc) =20 return count ? count : SHRINK_STOP; } - -static struct shrinker lazy_rcu_shrinker =3D { - .count_objects =3D lazy_rcu_shrink_count, - .scan_objects =3D lazy_rcu_shrink_scan, - .batch =3D 0, - .seeks =3D DEFAULT_SEEKS, -}; #endif // #ifdef CONFIG_RCU_LAZY =20 void __init rcu_init_nohz(void) @@ -1410,6 +1403,7 @@ void __init rcu_init_nohz(void) int cpu; struct rcu_data *rdp; const struct cpumask *cpumask =3D NULL; + struct shrinker * __maybe_unused lazy_rcu_shrinker; =20 #if defined(CONFIG_NO_HZ_FULL) if (tick_nohz_full_running && !cpumask_empty(tick_nohz_full_mask)) @@ -1436,8 +1430,15 @@ void __init rcu_init_nohz(void) return; =20 #ifdef CONFIG_RCU_LAZY - if (register_shrinker(&lazy_rcu_shrinker, "rcu-lazy")) - pr_err("Failed to register lazy_rcu shrinker!\n"); + lazy_rcu_shrinker =3D shrinker_alloc(0, "rcu-lazy"); + if (!lazy_rcu_shrinker) { + pr_err("Failed to allocate lazy_rcu shrinker!\n"); + } else { + lazy_rcu_shrinker->count_objects =3D lazy_rcu_shrink_count; + lazy_rcu_shrinker->scan_objects =3D lazy_rcu_shrink_scan; + + shrinker_register(lazy_rcu_shrinker); + } #endif // #ifdef CONFIG_RCU_LAZY =20 if (!cpumask_subset(rcu_nocb_mask, cpu_possible_mask)) { --=20 2.30.2