How to check the information of system sem and mutex?

[tzy0002088]

I want to view the holding information of all semaphores/mutexes in the system through shell commands. This will help me understand the running status of threads in the system, such as whether they are blocked on a mutex.

[tzy0002088]

Are there such shell commands currently available? I've looked into it and it seems there aren't any.

[ldomaigne]

Are there such shell commands currently available? I've looked into it and it seems there aren't any.

Looking at the shell kernel service no such command is available.

One option is to use the tracing subsystem to understand the system's dynamic. This goes further to what you're looking for, but will in particular show which thread is blocked when and on what. Tools like Percepio Tracealyzer or Segger SystemView can be used to visualize the traces taken.

If you're new to these tools, an option is to start with Percepio View for Zephyr.

[tzy0002088]

Are there such shell commands currently available? I've looked into it and it seems there aren't any.

Looking at the shell kernel service no such command is available.

One option is to use the tracing subsystem to understand the system's dynamic. This goes further to what you're looking for, but will in particular show which thread is blocked when and on what. Tools like Percepio Tracealyzer or Segger SystemView can be used to visualize the traces taken.

If you're new to these tools, an option is to start with Percepio View for Zephyr.

Yes, there is no such shell command. I just want to be able to inspect kernel objects such as semaphores and mutexes through the shell, because this is sometimes helpful for diagnosing whether a thread is permanently blocked on a certain kernel object.

[tzy0002088]

Are there such shell commands currently available? I've looked into it and it seems there aren't any.

Looking at the shell kernel service no such command is available.

One option is to use the tracing subsystem to understand the system's dynamic. This goes further to what you're looking for, but will in particular show which thread is blocked when and on what. Tools like Percepio Tracealyzer or Segger SystemView can be used to visualize the traces taken.

If you're new to these tools, an option is to start with Percepio View for Zephyr.

As for tracing, my project is very large. Enabling trace significantly affects the overall system performance. Are there any trace systems that have minimal impact on the system and provide visualization?

[ldomaigne]

I just want to be able to inspect kernel objects such as semaphores and mutexes through the shell, because this is sometimes helpful for diagnosing whether a thread is permanently blocked on a certain kernel object.

I agree. You'd need to add some new kernel shell commands for that. If you fancy to create a patch, we can help you with the upstream process :)

As for tracing, my project is very large. Enabling trace significantly affects the overall system performance. Are there any trace systems that have minimal impact on the system and provide visualization?

One way to minimize the system performance impact is to enable only the tracepoints you need through Kconfig option (CONFIG_TRACING_XXX). You can use Kconfig search with the regexp ^CONFIG_TRACING_* to list those options.