From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4CE3FC433F5 for ; Wed, 11 May 2022 22:36:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CCF046B0074; Wed, 11 May 2022 18:36:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C579A6B0075; Wed, 11 May 2022 18:36:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AF7326B0078; Wed, 11 May 2022 18:36:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 9C02C6B0074 for ; Wed, 11 May 2022 18:36:19 -0400 (EDT) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 7053620834 for ; Wed, 11 May 2022 22:36:19 +0000 (UTC) X-FDA: 79454922078.26.FB41F5F Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf29.hostedemail.com (Postfix) with ESMTP id 013041200BF for ; Wed, 11 May 2022 22:36:11 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0EBEA61D25; Wed, 11 May 2022 22:36:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56E45C34114; Wed, 11 May 2022 22:36:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1652308577; bh=iGqwGob0xieaSqpzSVhKd2KCpJBi2vPIuWbYJf0XuHM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=ARW7VKdh4O4YQnkdv5yrHMpHqsurm9kG3S8TB4zU1xJXGgKF0qnFNpfk6LOigv2OK ZJW2DHWsaXKwk3aW3zYuyj5BCc/iMfMpBkDEjmrNwDYSqlwygahpyxcdrZq9Ezuxbr dRFHMjZaw1wfjsg/A+gTEPOlJWdq//AkGcTajxyk= Date: Wed, 11 May 2022 15:36:16 -0700 From: Andrew Morton To: Eddie James Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: Add config option for default panic_on_oom value Message-Id: <20220511153616.9298d246adb1c7fea9ab453b@linux-foundation.org> In-Reply-To: References: <20220511183400.47940-1-eajames@linux.ibm.com> <20220511145648.3c421ff592df32766319ea2d@linux-foundation.org> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=ARW7VKdh; spf=pass (imf29.hostedemail.com: domain of akpm@linux-foundation.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 013041200BF X-Stat-Signature: 36awsikrwapqf1o6dpb9sxh8jcahodki X-HE-Tag: 1652308571-191819 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, 11 May 2022 17:06:35 -0500 Eddie James wrote: > > On 5/11/22 16:56, Andrew Morton wrote: > > On Wed, 11 May 2022 13:34:00 -0500 Eddie James wrote: > > > >> Add the option to kconfig and set the default panic_on_value. > > Why? What are the use-cases and how does this benefit our users? > > If a distribution (for example some embedded system distribution) wants > the system to always panic when OOM, they may as well configure their > kernel to do it by default, rather than writing to > /proc/sys/vm/panic_on_oom every boot. Maybe I'm missing another way to > do what I want here? Presumably such a distribution would do this in initramfs initscripts and forget about it. What inspired the patch? Have you seen a situation which was best solved with this change?