From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 396B5DDC5 for ; Sun, 4 May 2025 02:47:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746326828; cv=none; b=KThw2O9HwDrdz3I5ln3SB3m/QR6pfTMkTwAvE0RG/pJ5Md1KYcFSuIJvrB7t2DGtxDBfOI1PrHraEA5bOvoSRk/dYGTTKOxfPfRyAtmCbfgiS75RI7Ak0TIaVFrfb04pjsIuVCGDv8S0sGNpe4gonm2+t97VgKX+75wvma9xRWU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746326828; c=relaxed/simple; bh=+tb4EU2xeCSRO3c4Utxz10S/ojPi5oloC8rK0bnzl9s=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=iRYUlfeuRT57jJxp3MskrH9Ol1QuefoBU2L4yUREO3US4rIcgJdtgG5shjGb1c3yo9jKrNkTytc2RlgY4oL8y+s+FdvSvkkuG/2ppcYuAsMPqFkr75QSwENDIz0XMGIMNrv+XyHUY2dk6wSsqrPCIAc1m/bOjOhbmd3sbWLL0BE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=jghvY3S9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="jghvY3S9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56137C4CEE3; Sun, 4 May 2025 02:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1746326827; bh=+tb4EU2xeCSRO3c4Utxz10S/ojPi5oloC8rK0bnzl9s=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=jghvY3S9FY2S2ro9AyDF6CD85vcjLRKFrhrT/2GYNrRcLybuBP2qme1IvQl5SSkmC MBEIaXCwxjENd7tAjT58Z3vXB1KyatHKlZGJOcFzvOleHsbfwTAELJ0JJrHk7mTDJ8 IhEyTkZxFvwBly/k8F7o18KK2aYzcCgDsYHgIw6U= Date: Sat, 3 May 2025 19:47:06 -0700 From: Andrew Morton To: Max Kellermann Cc: song@kernel.org, joel.granados@kernel.org, dianders@chromium.org, cminyard@mvista.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] kernel/watchdog: add /sys/kernel/{hard,soft}lockup_count Message-Id: <20250503194706.d9e775fe8b24ad357cc6db89@linux-foundation.org> In-Reply-To: <20250502103905.3995477-1-max.kellermann@ionos.com> References: <20250502103905.3995477-1-max.kellermann@ionos.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) 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-Transfer-Encoding: 7bit On Fri, 2 May 2025 12:39:04 +0200 Max Kellermann wrote: > There is /proc/sys/kernel/hung_task_detect_count, > /sys/kernel/warn_count and /sys/kernel/oops_count but there is no > userspace-accessible counter for hard/soft lockups. Documenation/, please? > Having this is useful for monitoring tools. Useful how? Use cases? Examples? A proposal to permanently extend Linux's userspace API requires better justification than an unsubstantiated assertion, surely?