On 7/25/24 05:06, Laura Nao wrote:
Introduce a new kselftest to identify slowdowns in key boot events. The test uses ftrace to track timings for specific boot events. The kprobe_timestamps_to_yaml.py script can be run once to generate a YAML file with the initial reference timestamps for these events. The test_boot_time.py script can then be run on subsequent boots to compare current timings against the reference values and check for significant slowdowns over time. The test ships with a bootconfig file for ftrace setup and a config fragment for the necessary kernel configurations. Signed-off-by: Laura Nao <laura.nao@xxxxxxxxxxxxx>
I am repeating the same comments I made on the cover letter here as well. What are the dependencies if any for this new test to work? Please do remember that tests in default run needs to have minimal dependencies so they can run on systems that have minimal support. As mentioned earlier take a look at the tools/power/pm-graph bootgraph.py and sleepgraph.py to see if you can leverage them - bootgraph detects slowdowns during boot. We don't want to add duplicate scripts if the other one serves the needs. Those can be moved to selftests if it make sense. I will review this once we figure out if bootgraph serves the needs and I understand the dependencies for this test to work. thanks, -- Shuah
