Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751610AbdINRPp (ORCPT ); Thu, 14 Sep 2017 13:15:45 -0400 Received: from out0-237.mail.aliyun.com ([140.205.0.237]:43096 "EHLO out0-237.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751323AbdINRPS (ORCPT ); Thu, 14 Sep 2017 13:15:18 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R211e4;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e02c03311;MF=yang.s@alibaba-inc.com;NM=1;PH=DS;RN=8;SR=0;TI=SMTPD_---.8u6oxW-_1505409303; From: "Yang Shi" To: cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org Cc: "Yang Shi" , , Subject: [RFC] oom: capture unreclaimable slab info in oom message when kernel panic Date: Fri, 15 Sep 2017 01:14:46 +0800 Message-Id: <1505409289-57031-1-git-send-email-yang.s@alibaba-inc.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1248 Lines: 31 Recently we ran into a oom issue, kernel panic due to no killable process. The dmesg shows huge unreclaimable slabs used almost 100% memory, but kdump doesn't capture vmcore due to some reason. So, it may sound better to capture unreclaimable slab info in oom message when kernel panic to aid trouble shooting and cover the corner case. Since kernel already panic, so capturing more information sounds worthy and doesn't bother normal oom killer. With the patchset, /proc/slabinfo can print an extra column for reclaimable flag and tools/vm/slabinfo has a new option, "-U", to show unreclaimable slab only. And, oom will print all non zero (num_objs * size != 0) unreclaimable slabs in oom killer message. For details, please see the commit log for each commit. Yang Shi (3): mm: slab: output reclaimable flag in /proc/slabinfo tools: slabinfo: add "-U" option to show unreclaimable slabs only mm: oom: show unreclaimable slab info when kernel panic mm/oom_kill.c | 13 +++++++++++-- mm/slab.c | 1 + mm/slab.h | 7 +++++++ mm/slab_common.c | 27 +++++++++++++++++++++++++++ mm/slub.c | 1 + tools/vm/slabinfo.c | 11 ++++++++++- 6 files changed, 57 insertions(+), 3 deletions(-)