linux-kernel - [PATCH 0/3] mm, oom: add oom detection tracepoints

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Message-Id: <20161214145324.26261-1-mhocko@kernel.org>
Date:   Wed, 14 Dec 2016 15:53:21 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/3] mm, oom: add oom detection tracepoints

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(-)