From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753759AbcBCNOM (ORCPT ); Wed, 3 Feb 2016 08:14:12 -0500 Received: from mail-wm0-f67.google.com ([74.125.82.67]:33728 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751837AbcBCNOH (ORCPT ); Wed, 3 Feb 2016 08:14:07 -0500 From: Michal Hocko To: Andrew Morton Cc: David Rientjes , Mel Gorman , Tetsuo Handa , Oleg Nesterov , Linus Torvalds , Hugh Dickins , Andrea Argangeli , Rik van Riel , , LKML Subject: [PATCH 0/5] oom reaper v5 Date: Wed, 3 Feb 2016 14:13:55 +0100 Message-Id: <1454505240-23446-1-git-send-email-mhocko@kernel.org> X-Mailer: git-send-email 2.7.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I am reposting the whole patchset on top of mmotm with the previous version of the patchset reverted for an easier review. The series applies cleanly on top of the current Linus tree as well. The previous version was posted http://lkml.kernel.org/r/1452094975-551-1-git-send-email-mhocko@kernel.org I have tried to address most of the feedback. There was some push for extending the current implementation further but I do not feel comfortable to do that right now. I believe that we should start as easy as possible and add extensions on top. That shouldn't be hard with the current architecture. Wrt. the previous version, I have added patches 4 and 5. Patch4 reports success/failures to reap a task which is useful to see how the reaper operates. Patch 5 is implementing a more robust API between the oom killer and the oom reaper. We allow more tasks to be queued for the reaper at the same time rather than the original signle task mode. Patch 1 also dropped oom_reaper thread priority handling as per David. I ended up keeping vma filtering code inside __oom_reap_task. I still believe this is a better fit because the rules are a single fit for the reaper. They cannot be shared with a larger code base. In the meantime I have prepared down_write_killable rw_semaphore variant http://lkml.kernel.org/r/1454444369-2146-1-git-send-email-mhocko@kernel.org and also have a tentative patch to convert some users of mmap_sem for write to use the killable version. This needs more checking though but I guess I will have something ready in 2 weeks or so (I will be on vacation next week). For the general description of the oom_reaper functionality, please refer to Patch1. I would be really greatful if we could postpone any functional/semantical enhancements for later discussion and focus on the correctness of these particular patches as there were no fundamental objectios to the current approach. Thanks!