linux-kernel - [PATCH 0/2] New tracepoints for slowpath and memory compaction

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Date:	Wed, 27 Jul 2016 10:43:07 -0400
From:	Janani Ravichandran <janani.rvchndrn@...il.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:	riel@...riel.com, akpm@...ux-foundation.org, hannes@...pxchg.org,
	vdavydov@...tuozzo.com, mhocko@...e.com, vbabka@...e.cz,
	mgorman@...hsingularity.net, kirill.shutemov@...ux.intel.com,
	bywxiaobai@....com, rostedt@...dmis.org
Subject: [PATCH 0/2] New tracepoints for slowpath and memory compaction

Hi,

I am an Outreachy intern working under Rik van Riel on memory allocation 
latency tracing using tracepoints.
The goal of my project is to add tracepoints to code in vmscan.c and 
compaction.c to gain insight into what happens there and examine latencies
using a postprocessing script.

The one here:

https://github.com/Jananiravichandran/Analyzing-tracepoints/blob/master/shrink_slab_latencies.py

is a very basic script that shows how long direct reclaim and shrinkers take.
I intend to keep updating the script as more tracepoints are added in
the direct reclaim and compaction code and eventually submit the script
itself once I'm done.
Suggestions on this are most welcome! 

As of now, there are no mechanisms to find out how long slowpath and
memory compaction take to execute. This patchset adds new tracepoints 
and also modifies a couple of existing ones to address this and collect
some zone information that may be useful.

Janani Ravichandran (2):
  mm: page_alloc.c: Add tracepoints for slowpath
  mm: compaction.c: Add/Modify direct compaction tracepoints

 include/trace/events/compaction.h | 38 ++++++++++++++++++++++++++++++++-----
 include/trace/events/kmem.h       | 40 +++++++++++++++++++++++++++++++++++++++
 mm/compaction.c                   |  6 ++++--
 mm/page_alloc.c                   |  5 +++++
 4 files changed, 82 insertions(+), 7 deletions(-)

-- 
2.7.0