tracecmd-mkdot

A simple python script to generate dot files for vizualization of call graph from function call traces with trace-cmd command.

Usage

usage: tracecmd-mkdot [-h] [-d OUTPUTDIR]
                      [-c FUNCTION | -f FUNCTION | -t FUNCTION]
                      FILE

positional arguments:
  FILE                  input file

optional arguments:
  -h, --help            show this help message and exit
  -d OUTPUTDIR, --dir OUTPUTDIR
                        output directory
  -c FUNCTION, --contain FUNCTION
                        select call paths conain the function
  -f FUNCTION, --from FUNCTION
                        select call paths from the function
  -t FUNCTION, --to FUNCTION
                        select call paths to the function

Example

1. Record function call traces with trace-cmd command.

    # trace-cmd reset
    # trace-cmd record -p function dd if=/dev/zero of=testfile bs=30M count=1
    # trace-cmd report -O ftrace:parent=1 > trace-cmd_report.out
   

2. Run tracecmd-mkdot command with -c scsi_request_fn option. It select call paths contains scsi_request_fn function, and generate .gv files.

    # mkdir results
    # tracecmd-mkdot -d ./results -c scsi_request_fn ./trace-cmd_report.out
   

3. Run dot command for each .gv file to generate image files draw the selected call paths.

    # for FILE in $(ls *callpaths_*.gv); do echo "Processing $FILE"; dot -Tsvg -O $FILE; done
   

4. View the saved .svg files.

There are some example images in examples directory.