Allow multiple -p/-perfdata args (comma-separated and repeated).
Process them in parallel with `--perfdata-jobs/-pj` (default 4,
0 for all available hardware threads). Keep YAML/DataReader
inputs single-profile only.
This also enables density computation with multiple perf files.
Prior to that, it was impossible to compute total density as
it wasn't computed from symbolized profiles.
Depends on
#199323#199322#199321#199320
Test Plan:
Updated pre-aggregated-perf.test and perf_test
For a large binary (300MB text) and 7 ETM perf data files
(6GB each), compared to parallel perf2bolt + merge-fdata:
* processing time is equal: 670+3s -> 669s (within noise),
* output is equivalent: sorted fdata is equal.
Reviewers:
paschalis-mpeis, rafaelauler, yozhu, ayermolo, yavtuk, maksfb, yota9
Reviewed By: paschalis-mpeis, rafaelauler
Pull Request: https://github.com/llvm/llvm-project/pull/199324
61480755ee