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=-2.5 required=3.0 tests=MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 3939CC43331 for ; Fri, 6 Sep 2019 13:49:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 10B68206B8 for ; Fri, 6 Sep 2019 13:49:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 10B68206B8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B4DA36B0006; Fri, 6 Sep 2019 09:49:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AFE426B0007; Fri, 6 Sep 2019 09:49:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A14A36B0008; Fri, 6 Sep 2019 09:49:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0120.hostedemail.com [216.40.44.120]) by kanga.kvack.org (Postfix) with ESMTP id 8008D6B0006 for ; Fri, 6 Sep 2019 09:49:04 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 2BCBE180AD7C3 for ; Fri, 6 Sep 2019 13:49:04 +0000 (UTC) X-FDA: 75904627008.26.color43_6c3cc77e4ec02 X-HE-Tag: color43_6c3cc77e4ec02 X-Filterd-Recvd-Size: 2211 Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by imf13.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Sep 2019 13:49:03 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 685BAB034; Fri, 6 Sep 2019 13:49:02 +0000 (UTC) Date: Fri, 6 Sep 2019 15:49:01 +0200 From: Michal Hocko To: Tetsuo Handa Cc: Qian Cai , linux-mm@kvack.org Subject: Re: [RFC PATCH] mm, oom: disable dump_tasks by default Message-ID: <20190906134901.GG14491@dhcp22.suse.cz> References: <20190903144512.9374-1-mhocko@kernel.org> <1567522966.5576.51.camel@lca.pw> <20190903151307.GZ14028@dhcp22.suse.cz> <1567699853.5576.98.camel@lca.pw> <8ea5da51-a1ac-4450-17d9-0ea7be346765@i-love.sakura.ne.jp> <1567718475.5576.108.camel@lca.pw> <192f2cb9-172e-06f4-d9e4-a58b5e167231@i-love.sakura.ne.jp> <1567775335.5576.110.camel@lca.pw> <7eada349-90d0-a12f-701c-adac3c395e3c@i-love.sakura.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7eada349-90d0-a12f-701c-adac3c395e3c@i-love.sakura.ne.jp> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000031, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri 06-09-19 22:41:39, Tetsuo Handa wrote: > On 2019/09/06 22:08, Qian Cai wrote: > > Yes, mlocked is troublesome. I have other incidents where crond and systemd- > > udevd were killed by mistake, > > Yes. How to mitigate this regression is a controversial topic. > Michal thinks that we should make mlocked pages reclaimable, but > we haven't reached there. I think that we can monitor whether > counters decay over time (with timeout), but Michal refuses any > timeout based approach. We are deadlocked there. There is really nothing controversial here. It just needs somebody to do the actual work. Besides that I haven't seen any real workload to mlock so much memory that there won't be anything reapable. LTP oom test simply doesn't represent any real world workload. So while not optimal I do not really think this is something to lose sleep over. -- Michal Hocko SUSE Labs