lm-profiler not working on linux kernel 5.14 and higher

[chadek]

Describe the bug lm-profiler is not working on debian kernel 6.1.0-0.deb11.7-amd64 because of /proc/sys/vm/block_dump

To Reproduce Steps to reproduce the behavior:

1. install laptop-mode-tools on a machine with a kernel 5.14 or higher
2. run lm-profiler
3. The following error show up /usr/sbin/lm-profiler: 82: cannot create /proc/sys/vm/block_dump: Directory nonexistent

Expected behavior lm-profiler should start profiling

Important Information:

• Debian
• kernel 6.1.0-0.deb11.7-amd64
• Installed: 1.74-1.1

Additional context As describe here, block_dump was removed from kernel, they suggest to use tracepoints instead. Maybe looking at /sys/kernel/tracing/README might help to find a replacement to the old block_dump interface

[rickysarraf]

Thank you for the report. And my apologies for the delayed response 🙏🏽

I will check on the status and possible alternates.

[rickysarraf]

@chadek Does this look good to you ?

[chadek]

Just tried it out and it seams to work. I had no clue on how this tool work normally as it is the first time I use it. Profiling starts and seams to do the job. It would just be better if this tool as less dependency (btrace come with a lot a things) but this is an other topics.

Thanks for the fix!

[rickysarraf]

Just tried it out and it seams to work. I had no clue on how this tool work normally as it is the first time I use it. Profiling starts and seams to do the job. It would just be better if this tool as less dependency (btrace come with a lot a things) but this is an other topics.

Thanks for the fix!

Thanks for the feedback. The name being duplicate is a possibility, which is why that is pushed to the packagers, who could add a dependency/recommendation to this package.