swptracer

swptracer is an effective tool to visualize the change(swap) in memory and analyze it after executing the program. Memory movement (swap in, out) could be tracked and summarized by swptracer.

Environment/Requirement

• os : centos 7 ( linux series are available. )
• kernel : 5.1.14 ( older versions are available also.)
• python : 2.7.5
• plotly : for visualization

Kernel Patch

patch -p0 < $SWPTRACE/../swptracer.patch

In kernel directory adapt patch file. It will add lines to mm/page_io.c and mm/memory.c.

How To Use

Setup

1. Disable /etc/rsyslog.conf option

# Use traditional timestamp format.
# To enable high percision timestamps, comment out the following line
#
# $ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat <- Here

2. Run script and compile

# run setup
$ cd /PATH_TO_SWPTRACER_ROOT/
$ sh setup

# to check setup
$ echo $SWPTRACE
$ source ~/.bashrc

$ cd driver
$ make 

# install requisite package
# python=2.7.*
$ pip install $(cat requisite)
$ apt-get install python-tk

Execution

# <> is optional
$ python $SWPTRACE/exec.py <--faault> <--interval=MICROSECOND> "command to run"

# example 
$ python $SWPTRACE/exec.py --faault --interval=1000 "./script.sh"

OUTPUT

LOG_ROOT
|
| YYYY-MM-DDTHH:MM:SS.msec
          |  LOG_FILES.csv

Output plots

Scatter Plot

1. Plot with mode option

$ python $SWPTRACE/plot.py

2. Plot with memory map

$ python $SWPTRACE/plot.py -m|--mmap

Heatmap Plot

$ python $SWPTRACE/heatmap.py

Directory

• patch
• driver
• demo