Perfetto is a production-grade open-source stack for performance instrumentation and trace analysis. It offers services and libraries and for recording system-level and app-level traces, native + java heap profiling, a library for analyzing traces using SQL and a web-based UI to visualize and explore multi-GB traces.

See https://perfetto.dev/docs or the /docs/ directory for documentation.

Some stupid things that I've added (without fully tested, without any testcase, yes, without warranty, you've been warned):

• Add kernel_stack event, this is a trigger that can be used with ftrace events, maybe useful when debugging some functionality issues (may have no help with performance-related issues). Now the stack is available in processes' Callstack section.
• Support the riscv64 architecture, only tested with Lichee Pi 4A.

There's more things to be done:

• The code is extremely simple & naive, without any abstractions, and is not ready for production use, maybe there's a HUGE refactor then. Like some kind of proof-of-concept.
• Missing unittest, valgrind/asan test, etc.
• The perf sample section seems not combining well with ftrace event, if you want to view the stack of a ftrace event, you shall first locate the process first... So, may have a try to improve the UI?
• Fully UNTESTED, things might go wrong if you enable both fstacktrace and sampling_stack. And only linux.ftrace + linux.perf is working.