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Port powerpc-hcalls.py from tools/perf/scripts/python/ to a standalone
script in tools/perf/python/:
- Refactor the script into an HCallAnalyzer class with full type
annotations to encapsulate per-CPU hypervisor call entry/exit state.
- Use perf.session for event processing to track hypervisor call entry
and exit timestamps and aggregate min/max/average duration statistics
against HCALL_TABLE.
- Add argparse CLI support (-i/--input) and remove Python 2
compatibility code.
Add a shell test (test_powerpc_hcalls_python.sh) to verify the
standalone script.
Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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