From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932461AbcLNOxf (ORCPT ); Wed, 14 Dec 2016 09:53:35 -0500 Received: from mail-wj0-f193.google.com ([209.85.210.193]:33336 "EHLO mail-wj0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755266AbcLNOxe (ORCPT ); Wed, 14 Dec 2016 09:53:34 -0500 From: Michal Hocko To: Andrew Morton Cc: Vlastimil Babka , David Rientjes , Johannes Weiner , , LKML Subject: [PATCH 0/3] mm, oom: add oom detection tracepoints Date: Wed, 14 Dec 2016 15:53:21 +0100 Message-Id: <20161214145324.26261-1-mhocko@kernel.org> X-Mailer: git-send-email 2.10.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, this is a long overdue and I am really sorry about that. I just didn't get to sit and come up with this earlier as there was always some going on which preempted it. This patchset adds two tracepoints which should help us to debug oom decision making. The first one is placed in should_reclaim_retry and it tells us why do we keep retrying the allocation and reclaim while the second is in should_compact_retry which tells us the similar for the high order requests. In combination with the existing compaction and reclaim tracepoints we can draw a much better picture about what is going on and why we go and declare the oom. I am not really a tracepoint guy so I hope I didn't do anything obviously stupid there. Thanks to Vlastimil for his help before I've posted this. Anywa feedback is of course welcome! Michal Hocko (3): mm, trace: extract COMPACTION_STATUS and ZONE_TYPE to a common header oom, trace: Add oom detection tracepoints oom, trace: add compaction retry tracepoint include/trace/events/compaction.h | 56 ------------------------ include/trace/events/mmflags.h | 90 +++++++++++++++++++++++++++++++++++++++ include/trace/events/oom.h | 81 +++++++++++++++++++++++++++++++++++ mm/page_alloc.c | 32 ++++++++++---- 4 files changed, 195 insertions(+), 64 deletions(-)