Re: [PATCH v3 3/9] perf python stat-cpi: Fix live mode signal races and test flakiness

[sashiko-bot@kernel.org]

> In test_stat_cpi_python.sh, 'perf test -w noploop &' defaults to a
> 1-second duration and can exit under heavy parallel load before
> 'perf stat -p' and 'perf script stat-cpi' finish starting up. In
> addition, the fixed 'sleep 0.5' before sending SIGINT can fire before
> Python finishes importing the perf module, opening the live evlist, and
> flushing the first interval.
> 
> In stat-cpi.py, register SIGINT and SIGTERM handlers before calling
> _open_live_evlist() and pass flush=True when printing live output so
> redirected stdout is flushed immediately after each interval.
> 
> In test_stat_cpi_python.sh, run 'perf test -w noploop 60 &' so the
> target workload stays alive until killed, and poll the output file for
> 'cpi' (up to 5 seconds) before sending SIGINT.
> 
> Fixes: 4425182d426b ("perf python: Port stat-cpi to perf module")
> Assisted-by: Antigravity:gemini-3.1-pro
> Signed-off-by: Ian Rogers <irogers@google.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260929065839.407062-1-irogers@google.com?part=3