From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752641AbcAOPhm (ORCPT ); Fri, 15 Jan 2016 10:37:42 -0500 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:33546 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752394AbcAOPhk (ORCPT ); Fri, 15 Jan 2016 10:37:40 -0500 Date: Fri, 15 Jan 2016 15:37:21 +0000 From: One Thousand Gnomes To: Michal Hocko Cc: David Rientjes , linux-mm@kvack.org, Tetsuo Handa , LKML Subject: Re: [RFC 1/3] oom, sysrq: Skip over oom victims and killed tasks Message-ID: <20160115153721.7d363aef@lxorguk.ukuu.org.uk> In-Reply-To: <20160115101218.GB14112@dhcp22.suse.cz> References: <1452632425-20191-1-git-send-email-mhocko@kernel.org> <1452632425-20191-2-git-send-email-mhocko@kernel.org> <20160113093046.GA28942@dhcp22.suse.cz> <20160114110037.GC29943@dhcp22.suse.cz> <20160115101218.GB14112@dhcp22.suse.cz> Organization: Intel Corporation X-Mailer: Claws Mail 3.12.0 (GTK+ 2.24.29; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 15 Jan 2016 11:12:18 +0100 Michal Hocko wrote: > On Thu 14-01-16 13:51:16, David Rientjes wrote: > > I think it's time to kill sysrq+F and I'll send those two patches > > unless there is a usecase I'm not aware of. > > I have described one in the part you haven't quoted here. Let me repeat: > : Your system might be trashing to the point you are not able to log in > : and resolve the situation in a reasonable time yet you are still not > : OOM. sysrq+f is your only choice then. > > Could you clarify why it is better to ditch a potentially usefull > emergency tool rather than to make it work reliably and predictably? Even if it doesn't work reliably and predictably it is *still* better than removing it as it works currently. Today we have "might save you a reboot", the removal turns it into "you'll have to reboot". That's a regression. Alan