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Ruby binding-specific timeline visualizer extensions

Scripts in this directory extends the eBPF timeline visualizer tools in the mmtk-core repository to add more information about work packets defined in the mmtk-ruby binding.

Read mmtk-core/tools/tracing/timeline/README.md for the basic usage of the tools, and read mmtk-core/tools/tracing/timeline/EXTENSION.md for details about extensions.

Examples:

To capture a trace with Ruby-specific information:

/path/to/mmtk-core/tools/tracing/timeline/capture.py \
    -x /path/to/mmtk-ruby/tools/tracing/timeline/capture_ruby.bt \
    -m /path/to/mmtk-ruby/mmtk/target/release/libmmtk_ruby.so \
    > my-execution.log

To convert the log into the JSON format, with Ruby-specific information added to the timeline blocks:

/path/to/mmtk-core/tools/tracing/timeline/visualize.py \
    -x /path/to/mmtk-ruby/tools/tracing/timeline/visualize_ruby.bt \
    my-execution.log

It will generate my-execution.log.json.gz which can be loaded into Perfetto UI.