From: "Yang Shi" <yang.s@alibaba-inc.com>
To: cl@linux.com, penberg@kernel.org, rientjes@google.com,
iamjoonsoo.kim@lge.com, akpm@linux-foundation.org,
mhocko@kernel.org
Cc: Yang Shi <yang.s@alibaba-inc.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH 0/2 v4] oom: capture unreclaimable slab info in oom message when kernel panic
Date: Thu, 21 Sep 2017 06:38:50 +0800 [thread overview]
Message-ID: <1505947132-4363-1-git-send-email-yang.s@alibaba-inc.com> (raw)
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 v3 a??> v4:
* Solved the comments from David
* Added Davida??s Acked-by in patch 1
Changelog v2 a??> v3:
* Show used size and total size of each kmem cache per Davida??s comment
Changelog v1 a??> v2:
* Removed the original patch 1 (a??mm: slab: output reclaimable flag in /proc/slabinfoa??) since Christoph suggested it might break the compatibility and /proc/slabinfo is legacy
* Added Christopha??s Acked-by
* Removed acquiring slab_mutex per Tetsuoa??s comment
Yang Shi (2):
tools: slabinfo: add "-U" option to show unreclaimable slabs only
mm: oom: show unreclaimable slab info when kernel panic
mm/oom_kill.c | 3 +++
mm/slab.h | 8 ++++++++
mm/slab_common.c | 26 ++++++++++++++++++++++++++
tools/vm/slabinfo.c | 11 ++++++++++-
4 files changed, 47 insertions(+), 1 deletion(-)
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next reply other threads:[~2017-09-20 22:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-20 22:38 Yang Shi [this message]
2017-09-20 22:38 ` [PATCH 1/2] tools: slabinfo: add "-U" option to show unreclaimable slabs only Yang Shi
2017-09-20 22:38 ` [PATCH 2/2] mm: oom: show unreclaimable slab info when kernel panic Yang Shi
2017-09-21 8:23 ` David Rientjes
2017-09-21 17:51 ` Yang Shi
2017-09-25 14:23 ` [PATCH 0/2 v4] oom: capture unreclaimable slab info in oom message " Michal Hocko
2017-09-25 15:55 ` Yang Shi
2017-09-25 20:32 ` Michal Hocko
2017-09-25 21:52 ` Yang Shi
2017-09-26 7:56 ` Michal Hocko
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