From patchwork Mon Aug 7 11:09:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13343772 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 ADB41C001B0 for ; Mon, 7 Aug 2023 11:26:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232591AbjHGL0n (ORCPT ); Mon, 7 Aug 2023 07:26:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59162 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232234AbjHGL03 (ORCPT ); Mon, 7 Aug 2023 07:26:29 -0400 Received: from mail-oi1-x233.google.com (mail-oi1-x233.google.com [IPv6:2607:f8b0:4864:20::233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF03626A5 for ; Mon, 7 Aug 2023 04:22:56 -0700 (PDT) Received: by mail-oi1-x233.google.com with SMTP id 5614622812f47-3a7491aa219so448969b6e.1 for ; Mon, 07 Aug 2023 04:22:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1691407327; x=1692012127; 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=GSWsN00ewH1CUxuL2on0amogNZtYjpfZMPk3tXk1MLc=; b=PR6tXrjGVjIezWUoXO7YjEMWOuh+U8GCcH7EttqH2fPaYaijSI2xpWBV2GFMAUVnIJ gNsj45GoHaYF/0HiqwyTnPkSmC+ZPztt0LCFY6RbdTC2u21j34YhV1W1Tpwz5qlq253H 06n+Y7UjaxElLOUL4QrbURi1H78Gqs0l5RwCwExhj765J/x7vg9jIJVDfh4/gkv0LS1L czB7suv/F/Zan9eK3hZ/uHXaOZTxiq4BWRhh1V0eL0KY9f9QFWkC+aGYfC9PJPyqJVFk 8JnY3aGOH6WB683jOV/MRWzqeDn7rpp3iWy44rzCQK4GODBgLTOMP38xlMryl/ST+5Wv q7pw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691407327; x=1692012127; 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=GSWsN00ewH1CUxuL2on0amogNZtYjpfZMPk3tXk1MLc=; b=aodc8H7EPO5Sp1oE30ovZqTBDy/00hd3wWWnrVxNzn1tl9HOPVwNVhRy/FuJ4rlM0l weC1h3ceIh8hLds/XhMrvsfopxchhHAHdyEUOdWFyIR7W1vh3OS0znfTrgoy8ps7U/uL 0H0IEb2YZ5qfb4IdftuSiMVy62vvxHC0kwyIZCDjQ2tdtrOca09YivPJ1PvLuq7ZMHFF ihHMNl/7OTof7CpWg+LS2JReZqF6/uEHn4Is6iDuNPh3DreFW0cdsjypKKl6UEh/gRw3 X1CdUx3A5mrPD/9WAF4onABtlNsZB8Zct3i0Sqkpz/POrcx2nKKS23uuPCPFVj3If/k6 kqKA== X-Gm-Message-State: ABy/qLafmk/84ggljojaF5eK4SRPRsH4xg7le4Dc1gZyGuW0y5FP/2Y8 6Moouz07XunGX6eXCEeADV90tTQ5yXwd9sn7Hv8= X-Google-Smtp-Source: APBJJlEEwhe0wjgrc7nxC5j9G5K3ZI0sWgwDykpBRAx7nLtKV2LZNd6jgA89VvGSaryf9LAeIFxakg== X-Received: by 2002:a17:90a:901:b0:268:3a31:3e4d with SMTP id n1-20020a17090a090100b002683a313e4dmr23070871pjn.2.1691406828996; Mon, 07 Aug 2023 04:13:48 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id y13-20020a17090aca8d00b0025be7b69d73sm5861191pjt.12.2023.08.07.04.13.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Aug 2023 04:13:48 -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 Subject: [PATCH v4 18/48] rcu: dynamically allocate the rcu-lazy shrinker Date: Mon, 7 Aug 2023 19:09:06 +0800 Message-Id: <20230807110936.21819-19-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 Use new APIs to dynamically allocate the rcu-lazy shrinker. Signed-off-by: Qi Zheng Reviewed-by: Joel Fernandes (Google) --- kernel/rcu/tree_nocb.h | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 5598212d1f27..e1c59c33738a 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) return count ? count : SHRINK_STOP; } - -static struct shrinker lazy_rcu_shrinker = { - .count_objects = lazy_rcu_shrink_count, - .scan_objects = lazy_rcu_shrink_scan, - .batch = 0, - .seeks = DEFAULT_SEEKS, -}; #endif // #ifdef CONFIG_RCU_LAZY 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 = NULL; + struct shrinker * __maybe_unused lazy_rcu_shrinker; #if defined(CONFIG_NO_HZ_FULL) if (tick_nohz_full_running && !cpumask_empty(tick_nohz_full_mask)) @@ -1436,8 +1430,16 @@ void __init rcu_init_nohz(void) return; #ifdef CONFIG_RCU_LAZY - if (register_shrinker(&lazy_rcu_shrinker, "rcu-lazy")) - pr_err("Failed to register lazy_rcu shrinker!\n"); + lazy_rcu_shrinker = shrinker_alloc(0, "rcu-lazy"); + if (!lazy_rcu_shrinker) { + pr_err("Failed to allocate lazy_rcu shrinker!\n"); + } else { + lazy_rcu_shrinker->count_objects = lazy_rcu_shrink_count; + lazy_rcu_shrinker->scan_objects = lazy_rcu_shrink_scan; + lazy_rcu_shrinker->seeks = DEFAULT_SEEKS; + + shrinker_register(lazy_rcu_shrinker); + } #endif // #ifdef CONFIG_RCU_LAZY if (!cpumask_subset(rcu_nocb_mask, cpu_possible_mask)) {