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 X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 33CC5C43381 for ; Thu, 28 Mar 2019 22:46:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BEBEF2075E for ; Thu, 28 Mar 2019 22:46:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BEBEF2075E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=I-love.SAKURA.ne.jp Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3F8B06B0003; Thu, 28 Mar 2019 18:46:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3A7996B0006; Thu, 28 Mar 2019 18:46:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 296506B0007; Thu, 28 Mar 2019 18:46:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-pf1-f197.google.com (mail-pf1-f197.google.com [209.85.210.197]) by kanga.kvack.org (Postfix) with ESMTP id E73A06B0003 for ; Thu, 28 Mar 2019 18:46:05 -0400 (EDT) Received: by mail-pf1-f197.google.com with SMTP id b11so66730pfo.15 for ; Thu, 28 Mar 2019 15:46:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:subject:to :references:cc:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=9BvTe4MDDUohQzKvSWEOrLJ5MQ9S9B71FRrAUpw15qg=; b=buJE2x6vCtugIN5ajHab7MpKP3oc5yT1gMlK4GQ0VczrQzFG7O58EqCpejLUDwalus vuDdYcqp7aPoImMmdfhL8F7c2oc9c0wKmPJB3hlMWWcaUJ7B0bStefhgM72MyQgforF6 GetPeRtObkb5Lxnx9Jqcs90H5fY/59t3sZlGDavg7NxElYnfz5jY6gI/6QAlKC73odBf 70tYRJFB/KEwazkOJFOYMlPh9FIwTvRSuLpAgLa2yh5E3zYkAzJTikinzWn94g8/X0E0 qSV3sYh1tbbdopKKKrGZrTmRZOuhlVFTQgHBvVPxb8bQWOqXPN0qhscvHOMOTzjtmsh7 EkdA== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of penguin-kernel@i-love.sakura.ne.jp designates 202.181.97.72 as permitted sender) smtp.mailfrom=penguin-kernel@i-love.sakura.ne.jp X-Gm-Message-State: APjAAAXvCg9Gb+ZnypsEhRlxBoAPR2sYItVABYyMrxk3FyHwe/IubV4n ZqS5fa3kN+YshTn0f7dBTdE5ERaGGWC1JfsLgpEkQjKsbc+I0tKt78NWyRrbcjrJez5YjZV1wYz rY//yV9VMgwBH5emXrPTrvv32p0wexb8zwgFYLXeFSK322JBCzYhEyQ30vNit9/rPbw== X-Received: by 2002:a17:902:3a5:: with SMTP id d34mr43533578pld.174.1553813165644; Thu, 28 Mar 2019 15:46:05 -0700 (PDT) X-Google-Smtp-Source: APXvYqxfXmqx19oJV/3Am4irs2Z1Bf/TdGGjKQKKrwvDjO017wcMOhdsZjpSMiAh150IdMtlJrFn X-Received: by 2002:a17:902:3a5:: with SMTP id d34mr43533537pld.174.1553813164958; Thu, 28 Mar 2019 15:46:04 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1553813164; cv=none; d=google.com; s=arc-20160816; b=NANiUrvdfRaAt/wfMnh4qz/SfcGyJd2frpQPug+TS/FDbx3GDLreXdPMhHO+WWY40h mDd23j+CBmlab/59kWl9TPt5mvIjHhC43YxGqZ5mP/cPFWhOXGnV/if183N+sN9QEaSc MBcVFnNOKACJP/NqIs6Laa6PRx2EdC2duPOmQ1M3yikwOu0LUpOHOqYERJJqa9sCRtDh XTYja03kQoqXtk7p50lHg8KMFJWhEMBYYMCiF//L/ZYoMr+NYBtzyWHEX1eCGvSggtk3 pF+gfmOD2wZQBjV5gWFA3mL/AWQs6GxxZPq+fpkb9zvZpUrn6UBOvF1aQix2q8w6k6Ct Xxxg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:from:cc:references:to:subject; bh=9BvTe4MDDUohQzKvSWEOrLJ5MQ9S9B71FRrAUpw15qg=; b=ghzjrDWu+wEcR092REcU2nSu7LAuYjMTtoD9lQiQPWzDXDOjx/gOxWny8f0ohBu8w+ Lz//5GBhzCnGXlqiWT6cL4I0LFoz7QuzasfqCyC8FYyYnD8j8YXpnp94AlF+yxQ/uQ8s vCOyl6XbPkzxtomu6sHFhLciPTk88qaredt53NYN5HiXuvNWMZmhbv40khnu2VzfuIrt RuKPzjq/yKKSslRuNQ4roKjUwakzDaodcItiQjhNGlMRWsn5pdPBLTXcLTTrCyiT3gu9 dv7X4VxrJJzKzEJppxPvaFWBLfWWs2x8l2FuzdyS5hDMYu3jZEHAMF6J+3SO7DegWYrs yQlA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of penguin-kernel@i-love.sakura.ne.jp designates 202.181.97.72 as permitted sender) smtp.mailfrom=penguin-kernel@i-love.sakura.ne.jp Received: from www262.sakura.ne.jp (www262.sakura.ne.jp. [202.181.97.72]) by mx.google.com with ESMTPS id y9si317972pgg.15.2019.03.28.15.46.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 28 Mar 2019 15:46:04 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of penguin-kernel@i-love.sakura.ne.jp designates 202.181.97.72 as permitted sender) client-ip=202.181.97.72; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of penguin-kernel@i-love.sakura.ne.jp designates 202.181.97.72 as permitted sender) smtp.mailfrom=penguin-kernel@i-love.sakura.ne.jp Received: from fsav109.sakura.ne.jp (fsav109.sakura.ne.jp [27.133.134.236]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id x2SMk1nx051674; Fri, 29 Mar 2019 07:46:01 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav109.sakura.ne.jp (F-Secure/fsigk_smtp/530/fsav109.sakura.ne.jp); Fri, 29 Mar 2019 07:46:01 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/530/fsav109.sakura.ne.jp) Received: from [192.168.1.8] (softbank126072090247.bbtec.net [126.72.90.247]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id x2SMjqDP051640 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NO); Fri, 29 Mar 2019 07:46:01 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Subject: Re: sysrq key f to trigger OOM manually To: Vincent Li References: Cc: Linux-MM From: Tetsuo Handa Message-ID: Date: Fri, 29 Mar 2019 07:45:53 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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 2019/03/29 6:37, Vincent Li wrote: > Hi, > > not sure if this is the right place, I tried to use echo f > > /proc/sysrq-trigger to manually trigger OOM, the OOM killer is > triggered to kill a process, does it make sense to trigger OOM killer > manually but not actually kill the process, this could be useful to > diagnosis problem without actually killing a process in production > box. Why not use "/usr/bin/top -o %MEM" etc. ? Reading from /proc will give you more information than from SysRq.