From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751103AbcDIEjr (ORCPT ); Sat, 9 Apr 2016 00:39:47 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:17439 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750776AbcDIEjq (ORCPT ); Sat, 9 Apr 2016 00:39:46 -0400 To: mhocko@kernel.org Cc: linux-mm@kvack.org, rientjes@google.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, oleg@redhat.com Subject: Re: [PATCH 2/3] oom, oom_reaper: Try to reap tasks which skipregular OOM killer path From: Tetsuo Handa References: <1459951996-12875-1-git-send-email-mhocko@kernel.org> <1459951996-12875-3-git-send-email-mhocko@kernel.org> <201604072038.CHC51027.MSJOFVLHOFFtQO@I-love.SAKURA.ne.jp> <201604082019.EDH52671.OJHQFMStOFLVOF@I-love.SAKURA.ne.jp> <20160408115033.GH29820@dhcp22.suse.cz> In-Reply-To: <20160408115033.GH29820@dhcp22.suse.cz> Message-Id: <201604091339.FAJ12491.FVHQFFMSJLtOOO@I-love.SAKURA.ne.jp> X-Mailer: Winbiff [Version 2.51 PL2] X-Accept-Language: ja,en,zh Date: Sat, 9 Apr 2016 13:39:30 +0900 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Michal Hocko wrote: > On Fri 08-04-16 20:19:28, Tetsuo Handa wrote: > > I looked at next-20160408 but I again came to think that we should remove > > these shortcuts (something like a patch shown bottom). > > feel free to send the patch with the full description. But I would > really encourage you to check the history to learn why those have been > added and describe why those concerns are not valid/important anymore. I believe that past discussions and decisions about current code are too optimistic because they did not take 'The "too small to fail" memory- allocation rule' problem into account. If you ignore me with "check the history to learn why those have been added and describe why those concerns are not valid/important anymore", I can do nothing. What are valid/important concerns that have higher priority than keeping 'The "too small to fail" memory-allocation rule' problem and continue telling a lie to end users? Please enumerate such concerns. > Your way of throwing a large patch based on an extreme load which is > basically DoSing the machine is not the ideal one. You are not paying attention to real world's limitations I'm facing. I have to waste my resource trying to identify and fix on behalf of customers before they determine the kernel version to use for their systems, for your way of thinking is that "We don't need to worry about it because I have never received such report" while the reality of customers is that "I'm not skillful enough to catch the problematic behavior and make a reproducer" or "I have a little skill but I'm not permitted to modify my systems for reporting the problematic behavior". If you listen to me, I don't need to do such thing. It is very very sad. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f42.google.com (mail-pa0-f42.google.com [209.85.220.42]) by kanga.kvack.org (Postfix) with ESMTP id A6A8B6B007E for ; Sat, 9 Apr 2016 00:39:39 -0400 (EDT) Received: by mail-pa0-f42.google.com with SMTP id td3so86119667pab.2 for ; Fri, 08 Apr 2016 21:39:39 -0700 (PDT) Received: from www262.sakura.ne.jp (www262.sakura.ne.jp. [2001:e42:101:1:202:181:97:72]) by mx.google.com with ESMTPS id r1si4802799pai.141.2016.04.08.21.39.38 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 08 Apr 2016 21:39:38 -0700 (PDT) Subject: Re: [PATCH 2/3] oom, oom_reaper: Try to reap tasks which skipregular OOM killer path From: Tetsuo Handa References: <1459951996-12875-1-git-send-email-mhocko@kernel.org> <1459951996-12875-3-git-send-email-mhocko@kernel.org> <201604072038.CHC51027.MSJOFVLHOFFtQO@I-love.SAKURA.ne.jp> <201604082019.EDH52671.OJHQFMStOFLVOF@I-love.SAKURA.ne.jp> <20160408115033.GH29820@dhcp22.suse.cz> In-Reply-To: <20160408115033.GH29820@dhcp22.suse.cz> Message-Id: <201604091339.FAJ12491.FVHQFFMSJLtOOO@I-love.SAKURA.ne.jp> Date: Sat, 9 Apr 2016 13:39:30 +0900 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org List-ID: To: mhocko@kernel.org Cc: linux-mm@kvack.org, rientjes@google.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, oleg@redhat.com Michal Hocko wrote: > On Fri 08-04-16 20:19:28, Tetsuo Handa wrote: > > I looked at next-20160408 but I again came to think that we should remove > > these shortcuts (something like a patch shown bottom). > > feel free to send the patch with the full description. But I would > really encourage you to check the history to learn why those have been > added and describe why those concerns are not valid/important anymore. I believe that past discussions and decisions about current code are too optimistic because they did not take 'The "too small to fail" memory- allocation rule' problem into account. If you ignore me with "check the history to learn why those have been added and describe why those concerns are not valid/important anymore", I can do nothing. What are valid/important concerns that have higher priority than keeping 'The "too small to fail" memory-allocation rule' problem and continue telling a lie to end users? Please enumerate such concerns. > Your way of throwing a large patch based on an extreme load which is > basically DoSing the machine is not the ideal one. You are not paying attention to real world's limitations I'm facing. I have to waste my resource trying to identify and fix on behalf of customers before they determine the kernel version to use for their systems, for your way of thinking is that "We don't need to worry about it because I have never received such report" while the reality of customers is that "I'm not skillful enough to catch the problematic behavior and make a reproducer" or "I have a little skill but I'm not permitted to modify my systems for reporting the problematic behavior". If you listen to me, I don't need to do such thing. It is very very sad. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org