From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [160.30.148.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5E0CC22F764; Sat, 30 Aug 2025 06:29:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=160.30.148.35 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756535402; cv=none; b=RQp9c2mVD/abpG5HE1IJQtBNwaCat5qxu3qI+9EwYQH4024kUelfpDiVbRo2W03dwFs6v/Fz0ABMehXVSxRmLjN8cq5bTVrA2/2hrzPqXNqnaLptV/ZUP06zmDQLXWqPaGFh7Y4T17uHg7fBprTGnOBJThNJml071GUWp8oVy5I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756535402; c=relaxed/simple; bh=YZNhfwZ/t2MyKL3D0dFAq2T1Wp3ECR7VYFeNoeR4fCI=; h=Date:Message-ID:In-Reply-To:References:Mime-Version:From:To:Cc: Subject:Content-Type; b=fkW7UBlPr53GYi1ye8RiyU4rha8lz7yRb/ecF+O3FZfhA9J7jChZrLsh3OXV1NXGgn8e9s0Ttqd/6uXC2V4g0ZByEWAJUgBBc8Pr5qrZxYk5rEdGKatzdciEH7d3Ib5VoVVJNxECz0UOXVZAAm9UK781nhHTQ2I2DPrn/QdHRpg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zte.com.cn; spf=pass smtp.mailfrom=zte.com.cn; arc=none smtp.client-ip=160.30.148.35 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zte.com.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zte.com.cn Received: from mse-fl2.zte.com.cn (unknown [10.5.228.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mxhk.zte.com.cn (FangMail) with ESMTPS id 4cDQGh3z6nz8Xs6w; Sat, 30 Aug 2025 14:29:48 +0800 (CST) Received: from xaxapp05.zte.com.cn ([10.99.98.109]) by mse-fl2.zte.com.cn with SMTP id 57U6Th5Y086473; Sat, 30 Aug 2025 14:29:43 +0800 (+08) (envelope-from wang.yaxin@zte.com.cn) Received: from mapi (xaxapp02[null]) by mapi (Zmail) with MAPI id mid32; Sat, 30 Aug 2025 14:29:44 +0800 (CST) Date: Sat, 30 Aug 2025 14:29:44 +0800 (CST) X-Zmail-TransId: 2afa68b29a5841a-66dd7 X-Mailer: Zmail v1.0 Message-ID: <20250830142944929e1M6lffs_PwvPfl7J-R1g@zte.com.cn> In-Reply-To: <20250828092655.GA30360@didi-ThinkCentre-M930t-N000> References: 20250828092655.GA30360@didi-ThinkCentre-M930t-N000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 From: To: Cc: , , , , , , , , , , , , , , , , , , , , Subject: =?UTF-8?B?UmU6IFtQQVRDSCB2M10gZGVsYXlhY2N5L3NjaGVkOiBhZGQgU09GVElSUSBkZWxheQ==?= Content-Type: text/plain; charset="UTF-8" X-MAIL:mse-fl2.zte.com.cn 57U6Th5Y086473 X-TLS: YES X-SPF-DOMAIN: zte.com.cn X-ENVELOPE-SENDER: wang.yaxin@zte.com.cn X-SPF: None X-SOURCE-IP: 10.5.228.133 unknown Sat, 30 Aug 2025 14:29:48 +0800 X-Fangmail-Anti-Spam-Filtered: true X-Fangmail-MID-QID: 68B29A5C.000/4cDQGh3z6nz8Xs6w >Intro SOFTIRQ delay, so we can separate softirq as SOFTIRQ delay >and hardirq as {IRQ - SOFTIRQ} delay. > >A typical scenario is when tasks delayed by network, >if they delayed by rx net packets, i.e, net_rx_action(), >SOFTIRQ delay is almost same as IRQ delay; >if they delayed by, e.g, bad driver or broken hardware, >SOFTIRQ delay is almost 0 while IRQ delay remains big. > >Examples tool usage could be found in >Documentation/accounting/delay-accounting.rst > >Signed-off-by: Tio Zhang Reviewed-by: Wang Yaxin Thanks Yaxin