Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp2742050imu; Sun, 6 Jan 2019 08:58:03 -0800 (PST) X-Google-Smtp-Source: ALg8bN55VXvuG0aeOy33ztQJt3tasTk5N4GyEpD8S9zppaPjkCowk8YmJwdkO+bhy76Pdb393DN8 X-Received: by 2002:a17:902:b68d:: with SMTP id c13mr58079358pls.102.1546793883052; Sun, 06 Jan 2019 08:58:03 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1546793883; cv=none; d=google.com; s=arc-20160816; b=pACQa0U+IfnLql0bwwiPdgeBU7jIXeO84YjWU88au3OK/h4s/SpJPMt6WyVEe/KRhi FC/DvLCUMuQa053nUH3hHZIac2T8fgnmTZAvoAo7HjB5rAjLNPV1fmZB92TuKAwuvfyz 4d4kzufKdHzGANCLIxkRIR5xBHfuzxwJZRIiRx1rUIlPbPFSjktThWJJZBNKDkV0YaCf C0OwIXud2XavEmaLs/2ClZtNWmO8WOILAC76Mgu11JT0SbKV4BKXRU65bjkIylBIhJso TG41Xp87Ez6IZDe9VkuNNAuQcXkwQLpoh9TH5FO+qyyQs92ZQabtu8Lp2yTzzkozo809 g2jw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:from:subject:cc:to:message-id:date; bh=Tpv9LadvOOaF6RpG4N2Xw7MPilQdyaTm+wKvSkk+eEI=; b=KVLn3quJVkLLUzyJEZQlmsTCKSsLBtU5PZ8m8qnERfCoUm0HXJlIJWjEWFuA1z5Mbk yq+KJyp/U+v2ZayvS02CrPJIHrLjR0HfO5Anwo4HGRNby3Ggl46PO2DM2Nh2tj6F+aUC /d+HD0iP+60PcrE9CCS49iJnZl1SQJ988fhfu2AGMQJRQKntW7GVW7Yk1yjQPnF1kJNH kyGlZxnON1pElNDFVEkgTfPASrV7GiWrCkreyw4sHBbVKCe0xvvgo/GP9P345xkiyR0q OW5miW/8v0pWo+ppk5CEV6Yg5AGVEGodoJvTPSN/9MRJKYag0TQxS8jQjTTDTbxF0I1g 8XSQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id x14si912871plr.378.2019.01.06.08.57.34; Sun, 06 Jan 2019 08:58:03 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726084AbfAFQzp (ORCPT + 99 others); Sun, 6 Jan 2019 11:55:45 -0500 Received: from shards.monkeyblade.net ([23.128.96.9]:43110 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726012AbfAFQzo (ORCPT ); Sun, 6 Jan 2019 11:55:44 -0500 Received: from localhost (unknown [198.134.98.50]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id 0EEBC14BF79E0; Sun, 6 Jan 2019 08:55:44 -0800 (PST) Date: Sun, 06 Jan 2019 08:55:35 -0800 (PST) Message-Id: <20190106.085535.1209544587823450673.davem@davemloft.net> To: ap420073@gmail.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, daniel@iogearbox.net, ast@kernel.org, mcgrof@kernel.org Subject: Re: [PATCH net 1/4] umh: add exit routine for UMH process From: David Miller In-Reply-To: References: <20181230163143.21030-1-ap420073@gmail.com> <20190105.141021.1299321405902891635.davem@davemloft.net> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Sun, 06 Jan 2019 08:55:44 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Taehee Yoo Date: Sun, 6 Jan 2019 14:34:52 +0900 > How about adding a new PF_UMH flag for task_struct->flags to identify > UMH process? > By using this flag, the exit_umh() can avoid unnecessary lookups. Yes, that might be more efficient and eliminate the high cost for non-UMH tasks.