jverma-quic opened a new pull request, #12971:
URL: https://github.com/apache/tvm/pull/12971
This's done by instrumenting the code with profiling builtin calls using a
TIR pass. During codegen, these builtin calls are replaced with the calls to a
hexagon specific handler which records the runtime information into a buffer.
This buffer is written into a JSON file ('lwp.json') which is processed to
construct function and loop-level profiling information as a csv file.
At a high-level, this PR makes the following changes:
1) Add a TIR pass (src/tir/transforms/profile_instrumentation.cc) to
instrument the functions and loops with profilging builtins.
2) Hexagon codegen changes to replace profilng builtin calls with the call
to Hexagon specific handler. This handler record the runtime data into a
buffer. For all other targets, these builtin calls are ignored.
3) Add API to RPC Launcher to get the profiling data as a JSON file
4) Add a python script
(python/tvm/contrib/hexagon/profiling/process_lwp_data.py) to process the
profiling data and construct a CSV file
5) Add TVM script based unit tests to test and demonstrate various profiling
config flags: tests/python/unittest/test_tir_transform_profiling_instr.py
6) Adds two tests in tests/python/contrib/test_hexagon/test_launcher.py to
demonstrate necessary changes to enable profiling and to collect and process
runtime data.
For additional details, please refer to
src/runtime/hexagon/profiler/README.md and apps/hexagon_launcher/README.md.
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