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[2620:137:e000::1:20]) by mx.google.com with ESMTP id p9-20020a170906140900b00993689daad1si441564ejc.116.2023.07.10.13.45.07; Mon, 10 Jul 2023 13:45:31 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20221208 header.b=EsZBIRtD; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231207AbjGJU0k (ORCPT + 99 others); Mon, 10 Jul 2023 16:26:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229560AbjGJU0j (ORCPT ); Mon, 10 Jul 2023 16:26:39 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 725C4197; Mon, 10 Jul 2023 13:26:38 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id d9443c01a7336-1b8a462e0b0so24350845ad.3; Mon, 10 Jul 2023 13:26:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1689020798; x=1691612798; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=7xgjrQEr6levT2Vh4gm5c8CAJzd+VPW+vgoJrm3ih5I=; b=EsZBIRtDuJuW04K32p8u/Gh+PXrCbedviP0ImFheHGcG49q0PAmTdS14ZtPsv3tQPJ C2MOrVq12H6sUuqpRZVJ7+Bs31Dbfpff0lo5Ky2t08zmkpl4ff9SJCK5zyq1Z7o5AnS5 2yBQk7FUrYUVrVRVMoGN2jrPiRpWjveMsSZPeQZPlkwXbmvTbl2Ja2/GTaYZ6+IDnFrb FdbtcgZFOPo2OcKcUcok4j4ERb43A7D+mdssF3rSgzA6JOYnZBbCo1AllZzg/nfG0UjT zbvbaw1mXEngcRIU4M2bK1clyOetrCBqjFhDmPNWzps/4bqGCwLXvJb7bJ5pRBVIr2lf L5qQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689020798; x=1691612798; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=7xgjrQEr6levT2Vh4gm5c8CAJzd+VPW+vgoJrm3ih5I=; b=Nb2Pewt7NZpU3tsgdFsG0p/2TWFItSEKvlh6XenXiLotPZO/oD/3wXj/D/zIix44el xboVNo7E+sU0xh//nDSt2f15SMhR9Z4xiG8jlB+uSfNyntjSwc7byzrL2hMozqnfqwU4 +HSEevbtFEptFZkkV5xjdt2kqalTYrmnqeE+r3KFvYEBlmd4Eza/aT5IT8/xztsV8qyW /VLdCbXHj5K4Si0XrmNFhpZMN0+dZCVYnIHq/yMm1MF0qLH1DbCgWfn42Z1ySDC8IhoT DO9F0eT/3GhT4xVU0DD0OSlY8ai2KbjX0qdlRDr8dTjWz+/MqVZXQLUT0jpt3pQgd58R zIlg== X-Gm-Message-State: ABy/qLYUIY/ycbWU5izSPzzt4fKvAEQ1jP6D/iU+v7Myz+ovXPBunbDb CIz0GyfBxDAipwbeqwuCUkA= X-Received: by 2002:a17:902:758b:b0:1b8:5aa2:d17a with SMTP id j11-20020a170902758b00b001b85aa2d17amr10531955pll.7.1689020797760; Mon, 10 Jul 2023 13:26:37 -0700 (PDT) Received: from localhost ([2620:10d:c090:400::5:e2fe]) by smtp.gmail.com with ESMTPSA id w24-20020a1709029a9800b001b8a3e2c241sm316348plp.14.2023.07.10.13.26.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Jul 2023 13:26:37 -0700 (PDT) Sender: Tejun Heo Date: Mon, 10 Jul 2023 10:26:36 -1000 From: Tejun Heo To: Miaohe Lin Cc: longman@redhat.com, hannes@cmpxchg.org, lizefan.x@bytedance.com, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] cgroup/cpuset: avoid unneeded cpuset_mutex re-lock Message-ID: References: <20230704120352.1226787-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230704120352.1226787-1-linmiaohe@huawei.com> X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 04, 2023 at 08:03:52PM +0800, Miaohe Lin wrote: > cpuset_mutex unlock and lock pair is only needed when transferring tasks > out of empty cpuset. Avoid unneeded cpuset_mutex re-lock when !is_empty > to save cpu cycles. > > Signed-off-by: Miaohe Lin Applied to cgroup/for-6.6. Thanks. -- tejun