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[209.85.220.65]) by mx.google.com with SMTPS id h12sor583346qth.20.2019.03.28.18.04.13 for (Google Transport Security); Thu, 28 Mar 2019 18:04:13 -0700 (PDT) Received-SPF: pass (google.com: domain of vincent.mc.li@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=T6duP2l9; spf=pass (google.com: domain of vincent.mc.li@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=vincent.mc.li@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=qLvJpD5VtGmd85WRPzy2IOxg0BGUhYP6z/BWmT7XiCA=; b=T6duP2l9Qfj6Gx11JdzcV3DBT6F21EIPjf8eix7uAQ16bl8AGXrlzHrZNc5Ej1ApIC KTdkiSiS86LXbFW8XleLeuA5nLxaqmjgWBACd9Aun4WRVSajPrwXo7LCkJsnCyg7g/rq e2olkqWgxe+lRzzasc583vhtnU1b/syWyXW0lYqbKIB0tWUq3hY9ALyMAd5NutjLm07w SVoT+bq4oswBax3iJGTeNW6Oc+WfiWnPx57EMvRFhgnFvKQVfKiMqyUKjD4KjMy6MWAi obLdzLbG3yI2DMperFoHl2ak1P3xZZTur/o2VfBFG92i9NoWzQnOwnA+PRbjXg/cJR4b ko9w== X-Google-Smtp-Source: APXvYqzdS0mmjOEg9m9D3hqyflNoUXl5SJGeDWK/v3XEo4e9pELE4hrvhDnaDbdj090moRojWy3432aeabDcMY+r0Wg= X-Received: by 2002:ac8:2e99:: with SMTP id h25mr39847974qta.166.1553821453422; Thu, 28 Mar 2019 18:04:13 -0700 (PDT) MIME-Version: 1.0 References: <201903290006.x2T06fWZ001228@www262.sakura.ne.jp> In-Reply-To: <201903290006.x2T06fWZ001228@www262.sakura.ne.jp> From: Vincent Li Date: Thu, 28 Mar 2019 18:04:02 -0700 Message-ID: Subject: Re: sysrq key f to trigger OOM manually To: Tetsuo Handa Cc: Linux-MM Content-Type: text/plain; charset="UTF-8" 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 Thu, Mar 28, 2019 at 5:06 PM Tetsuo Handa wrote: > > > On Thu, Mar 28, 2019 at 3:46 PM Tetsuo Handa > > wrote: > > > > > > 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. > > > > I am interested to see OOM output including swap entries per process > > in swap partition and all > > the other kernel internal virtual memory stats, I find it useful than > > top or free or /proc/meminfo > > > > Please read http://man7.org/linux/man-pages/man5/proc.5.html and/or > https://www.kernel.org/doc/Documentation/filesystems/proc.txt . Thanks, I know I can get lots of information from /proc//, but I like the format/style that OOM dumps since I don't have to use some kind of script to parse out the /proc/, plus, OOM also dumps node/zone/page orders....information all together, lots of useful information so I can have big picture on the memory usage of the system.