From nobody Thu Dec 18 04:42:42 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 BDEADC88CB9 for ; Thu, 24 Aug 2023 03:48:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239741AbjHXDrq (ORCPT ); Wed, 23 Aug 2023 23:47:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239907AbjHXDrD (ORCPT ); Wed, 23 Aug 2023 23:47:03 -0400 Received: from mail-ot1-x334.google.com (mail-ot1-x334.google.com [IPv6:2607:f8b0:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A5FA1FEA for ; Wed, 23 Aug 2023 20:46:14 -0700 (PDT) Received: by mail-ot1-x334.google.com with SMTP id 46e09a7af769-6b9cd6876bbso1576341a34.1 for ; Wed, 23 Aug 2023 20:46:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1692848767; x=1693453567; 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=jbLfXpJ5k+PGfjQYbmEIBs5kJh5lwx6o5Ugx6JEi6xI=; b=IiUiN/bjqiAul2GXQb13RT5me6vau/bBJzSckp9JXiUe4upPQ4em6kTToIKAFTll3V Od3tGDJwfVOeeuoD7X2EdAVfF3HPWTlZ379KPWAjglBaydKVz0P1Hs1lgLWTBOah8eGj 9W2J0Tg6X9lao7+B7pf3NZT+M+RtKhGRzRyIYKpYq+oH9zZ4ysBCEvJaRnJQ2l+lgMQs g+fM8GGLrltVPCbIHCYmgNFEuprUMghQsdUn/H1ZL0iRuqXsb6LQO6t51GfVcUhEB3FE pFTkHgfMldahqqgP2ReV92FlLRtEuIRBNLkFkh+gLZcEWEOsxcxLNSMAqfjCgA5BXPG+ TcTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692848767; x=1693453567; 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=jbLfXpJ5k+PGfjQYbmEIBs5kJh5lwx6o5Ugx6JEi6xI=; b=THONVAdtzneBOlPluzNiUSvTzoKGKChUrkP7vTIm9PskJ69GvvyP045K0vlHIIzchR QAdCtLzRDf+a4uS6Ls7TwxbWbuosmgilBW1uQpqaO1zxtTl1Z+Wwc+4R8Nmt1eywexRM 2RTfRZQ3cXtMtRcjJTahEzaZqGJBPmm5yjB0b4LNPP6YJfDLVHIAeSAj6OFwED/usM3h /C11Fd6fpdM/CpJ8VsT1GLBeMcSZMesRpeoMOi6gr8xhtr4rBBPOOEiX0dKWJ15ifSf0 NGfKknXDyJKZPmqr6FUCMVLSTt68sxB5hExCD6/AP/KOhelrzUX45q0TBWeEoQZdwKBD OEaQ== X-Gm-Message-State: AOJu0Yyf1SRoGQ+lN0fJ3Ff9vxVlMaNNY6du+vskSdtUOljUA7z7CR5x LLnjfNU8JehoMZUdQiOqXYr1uw== X-Google-Smtp-Source: AGHT+IElYmAgq8IBCNiz5zLW6QeFhOfwrpP1ZIem3nvpFvdyyt2pB6ZEtNpkzev9+iVdtus0IhkeTA== X-Received: by 2002:a05:6830:65cb:b0:6b9:db20:4d25 with SMTP id co11-20020a05683065cb00b006b9db204d25mr16409143otb.1.1692848767184; Wed, 23 Aug 2023 20:46:07 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id t6-20020a63b246000000b005579f12a238sm10533157pgo.86.2023.08.23.20.45.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Aug 2023 20:46:06 -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 , Muchun Song , rcu@vger.kernel.org Subject: [PATCH v5 16/45] rcu: dynamically allocate the rcu-kfree shrinker Date: Thu, 24 Aug 2023 11:42:35 +0800 Message-Id: <20230824034304.37411-17-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" Use new APIs to dynamically allocate the rcu-kfree shrinker. Signed-off-by: Qi Zheng Reviewed-by: Joel Fernandes (Google) Reviewed-by: Muchun Song CC: rcu@vger.kernel.org --- kernel/rcu/tree.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index cb1caefa8bd0..6d2f82f79c65 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3449,13 +3449,6 @@ kfree_rcu_shrink_scan(struct shrinker *shrink, struc= t shrink_control *sc) return freed =3D=3D 0 ? SHRINK_STOP : freed; } =20 -static struct shrinker kfree_rcu_shrinker =3D { - .count_objects =3D kfree_rcu_shrink_count, - .scan_objects =3D kfree_rcu_shrink_scan, - .batch =3D 0, - .seeks =3D DEFAULT_SEEKS, -}; - void __init kfree_rcu_scheduler_running(void) { int cpu; @@ -4931,6 +4924,7 @@ static void __init kfree_rcu_batch_init(void) { int cpu; int i, j; + struct shrinker *kfree_rcu_shrinker; =20 /* Clamp it to [0:100] seconds interval. */ if (rcu_delay_page_cache_fill_msec < 0 || @@ -4962,8 +4956,18 @@ static void __init kfree_rcu_batch_init(void) INIT_DELAYED_WORK(&krcp->page_cache_work, fill_page_cache_func); krcp->initialized =3D true; } - if (register_shrinker(&kfree_rcu_shrinker, "rcu-kfree")) - pr_err("Failed to register kfree_rcu() shrinker!\n"); + + kfree_rcu_shrinker =3D shrinker_alloc(0, "rcu-kfree"); + if (!kfree_rcu_shrinker) { + pr_err("Failed to allocate kfree_rcu() shrinker!\n"); + return; + } + + kfree_rcu_shrinker->count_objects =3D kfree_rcu_shrink_count; + kfree_rcu_shrinker->scan_objects =3D kfree_rcu_shrink_scan; + kfree_rcu_shrinker->seeks =3D DEFAULT_SEEKS; + + shrinker_register(kfree_rcu_shrinker); } =20 void __init rcu_init(void) --=20 2.30.2