From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f177.google.com (mail-pg1-f177.google.com [209.85.215.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B9EC338DD8 for ; Tue, 6 Aug 2024 20:07:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722974871; cv=none; b=VQ68RAFcLuQvwl2yWriLz9F01SS/l3h8IokgS+lMny2XDpCFvQ/DnONvCxv1A5Jmcv0CgrRrtgC+zlfHHW+F8XXW1IHEFifi5HaAuRO4uxRaJgXu2UOZoOo/wLGtTT4VMHjWVi/NlIssWrKa1wK6V8JNLYvT7LH6TXehZB+6a0w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722974871; c=relaxed/simple; bh=spYpuKe+YufYSHkJ1dbjLL9KO56fORb4N/F2Ur24EdM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dSQx1WanDLmefaNtO+tCluwS799cU8StoDn4OD7GSbUhXoABqO1Y52Uba9eI/VW1WaVBwvTxBP4G2F0sF4lXtU9YFeaCH42fiE3dJmnCK+0pFUSSjw0jyS0BXY5HbY4M7NNId25kWIujodN+rnQsUxLcTdRWG/KrLaudgKNAdyg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=SzN74Qqq; arc=none smtp.client-ip=209.85.215.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="SzN74Qqq" Received: by mail-pg1-f177.google.com with SMTP id 41be03b00d2f7-7b396521ff6so696176a12.1 for ; Tue, 06 Aug 2024 13:07:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1722974869; x=1723579669; darn=vger.kernel.org; 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=dE2up1BgP3c77I6PLxav9RvKnXu1I5j6uX44coRXaF4=; b=SzN74Qqq0DW63tGR2Drx3LGXZ7FQMzvIDDKN6j4Py8dbQsoUFMCYLUjZdgpsMtZ99W XwdJe0JgnP5Al4etDBcOho3Qw2TYVyHUOuszMxgrkTvS+wEvhLrJkcVcvmidQNbBGR9H K9DTnRC74rNCaYH3MCw1qmX9wTkJ3X21ZCvnSSjX3JYPN9Tm4l3sMMsG15i0yBqnk1UW eS5ctfiNna8xtB01NfpOZHOjlRHbgYmwmDVgy7ZZ71gZcLaaOftg70EG+19iZtawnoyf c9rb656a7Q/G+FVEJAxQxJga+d2MKCl3v1UyHxBnakSRAUT99RoTnw4Ac6xaaDkF6fyd UBnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722974869; x=1723579669; 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=dE2up1BgP3c77I6PLxav9RvKnXu1I5j6uX44coRXaF4=; b=RUWIfZkHhBYFZ8Y6g0Taqu91wmUEGcmD9+9ozSNdSpOB9S80cWS7yZ+mI9uIn1Ncxv R03cxDozGUQkyEW4H1MNn0ds/LACyLAq30ROFJpLRc66tSObYojFxitgKiRZ2WbEPGBo yftJgBqszthXt2RhwO31+yC2UcZZpbQGkGFDtdiOPdoFJLUzl8UsC5Zo9uxjH1a1wMmz cEqJ6GPq+6BqRIQRCQf64a8VGcUBVGB5g22Rac/meh8uhfyWK+FzLunE64tX9xVhgA3h 4zQ3tezKBTrYF6j/ndolAiqt9wiOFXmUx/AYDnMuCTWANPI2FBbDag9n5y5KcUgxrswU pBSg== X-Forwarded-Encrypted: i=1; AJvYcCWrWAImiHQX4/fyhudB+pj+XGaaNnR6iXLxPzkjE+a0zpFBopNQA47KPVK5rh0FVhsJfkxDCHiM2cUVBZ47XzVkyCvqJl3QcAzAWd+D X-Gm-Message-State: AOJu0YxU5nS1abWihTlzSMZbeMpusZ7QLJuO1BPNrSt7WMdVdddyax4j jzWYIAmJDLZECkq9Mkg7M8EOONmkCq1qSqSgHvG8jrZeNKTLKEm3 X-Google-Smtp-Source: AGHT+IF63w4KJx0GEIi96xwVAzB+2uB/dipNkWfnTmrfvj/uzxHecrp6jUYRnDK0bmqfKtxUAbiCSg== X-Received: by 2002:a17:90a:c585:b0:2cb:5678:7a1c with SMTP id 98e67ed59e1d1-2cff9413dbfmr19665316a91.18.1722974868867; Tue, 06 Aug 2024 13:07:48 -0700 (PDT) Received: from localhost (dhcp-72-235-129-167.hawaiiantel.net. [72.235.129.167]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2cfdc40648esm13090653a91.5.2024.08.06.13.07.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Aug 2024 13:07:48 -0700 (PDT) Sender: Tejun Heo Date: Tue, 6 Aug 2024 10:07:46 -1000 From: Tejun Heo To: Sangmoon Kim Cc: youngjae24.lim@samsung.com, jordan.lim@samsung.com, myoungjae.kim@samsung.com, Lai Jiangshan , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] workqueue: add cmdline parameter workqueue.panic_on_stall Message-ID: References: <20240806051209.3352066-1-sangmoon.kim@samsung.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240806051209.3352066-1-sangmoon.kim@samsung.com> On Tue, Aug 06, 2024 at 02:12:09PM +0900, Sangmoon Kim wrote: > When we want to debug the workqueue stall, we can immediately make > a panic to get the information we want. > > In some systems, it may be necessary to quickly reboot the system to > escape from a workqueue lockup situation. In this case, we can control > the number of stall detections to generate panic. > > workqueue.panic_on_stall sets the number times of the stall to trigger > panic. 0 disables the panic on stall. > > Signed-off-by: Sangmoon Kim Appled to wq/for-6.12. Can you do a follow-up patch to document it in kernel-parameters? Thanks. -- tejun