Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1032885AbdI0Axz (ORCPT ); Tue, 26 Sep 2017 20:53:55 -0400 Received: from out0-235.mail.aliyun.com ([140.205.0.235]:42717 "EHLO out0-235.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030619AbdI0Axx (ORCPT ); Tue, 26 Sep 2017 20:53:53 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R111e4;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e02c03302;MF=yang.s@alibaba-inc.com;NM=1;PH=DS;RN=9;SR=0;TI=SMTPD_---.9-cox30_1506473617; From: "Yang Shi" To: cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, mhocko@kernel.org Cc: "Yang Shi" , , Subject: [PATCH 0/3 v7] oom: capture unreclaimable slab info in oom message when kernel panic Date: Wed, 27 Sep 2017 08:53:33 +0800 Message-Id: <1506473616-88120-1-git-send-email-yang.s@alibaba-inc.com> X-Mailer: git-send-email 1.8.3.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2173 Lines: 51 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, 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. Changelog v6 -> v7: * Added unreclaim_slabs_oom_ratio proc knob, unreclaimable slabs info will be dumped when unreclaimable slabs amount : all user memory > the ratio Changelog v5 —> v6: * Fixed a checkpatch.pl warning for patch #2 Changelog v4 —> v5: * Solved the comments from David * Build test SLABINFO = n Changelog v3 —> v4: * Solved the comments from David * Added David’s Acked-by in patch 1 Changelog v2 —> v3: * Show used size and total size of each kmem cache per David’s comment Changelog v1 —> v2: * Removed the original patch 1 (“mm: slab: output reclaimable flag in /proc/slabinfo”) since Christoph suggested it might break the compatibility and /proc/slabinfo is legacy * Added Christoph’s Acked-by * Removed acquiring slab_mutex per Tetsuo’s comment Yang Shi (3): tools: slabinfo: add "-U" option to show unreclaimable slabs only mm: oom: show unreclaimable slab info when kernel panic doc: add description for unreclaim_slabs_oom_ratio Documentation/sysctl/vm.txt | 12 ++++++++++++ include/linux/oom.h | 1 + include/uapi/linux/sysctl.h | 1 + kernel/sysctl.c | 9 +++++++++ kernel/sysctl_binary.c | 1 + mm/oom_kill.c | 31 +++++++++++++++++++++++++++++++ mm/slab.h | 8 ++++++++ mm/slab_common.c | 29 +++++++++++++++++++++++++++++ tools/vm/slabinfo.c | 11 ++++++++++- 9 files changed, 102 insertions(+), 1 deletion(-)