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When all Python shell tests run concurrently during 'perf test' under
heavy load:
1. Unfiltered 'perf list' initializes all hardware PMUs and metrics in
each test process; use 'perf list tracepoint' when checking for
tracepoint events.
2. Running 'perf record' without '-B -N --no-bpf-event' synthesizes BPF
events across the system and caches build-ids into ~/.debug; add
'-B -N --no-bpf-event' to all Python shell test recordings.
3. Drop '-a' in test_check_perf_trace_python.sh,
test_rw_by_file_python.sh, test_rw_by_pid_python.sh,
test_rwtop_python.sh, and test_syscall_counts_by_pid_python.sh where
only a single child workload ('dd' or 'sleep') is tested, avoiding
system-wide /proc synthesis and ringbuffer contention.
4. Add '-W 1' to 'ping -c 1' in test_net_dropmonitor_python.sh and
test_netdev_times_python.sh, and narrow 'compaction:*' to
'compaction:mm_compaction_begin,compaction:mm_compaction_end' in
test_compaction_times_python.sh.
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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Refactor 'perf script' to launch standalone scripts directly via fork()
and execvp() and remove the legacy embedded Perl and Python scripting
engines:
- Remove the embedded Perl scripting engine
(util/scripting-engines/trace-event-perl.c), Perl scripts, bin
wrappers, and Trace-Util library
(scripts/perl/Perf-Trace-Util/), and script_perl.sh test.
- Remove libperl feature checks from Makefile.config, Makefile.perf,
builtin-check.c, and Documentation/perf-check.txt.
- Remove -g / --gen-script option and scripting_ops dispatch table from
builtin-script.c and trace-event-scripting.c.
- Hide the legacy -s / --script option and update script discovery in
find_script() and list_available_scripts() to prioritize the system
'python' directory over bare filenames in the current directory.
- Update the Python script shell tests (test_arm_coresight_disasm.sh,
test_task_analyzer.sh, and test_*_python.sh) to invoke scripts via
'perf script <script>' rather than running the Python interpreter
directly on the script file path.
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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Replace the legacy Perl script wakeup-latency.pl with a standalone
Python script in tools/perf/python/wakeup-latency.py using the perf
Python module.
Improvements compared to the legacy Perl script:
- Remove the dependency on libperl and Perf::Trace::Util.
- Track wakeup timestamps per-task (keyed by the wakee PID on
sched:sched_wakeup and matched against next_pid on sched:sched_switch)
rather than per-CPU, avoiding mixed latencies when multiple wakeups
occur on a CPU before a context switch.
- Guard print_totals() when total_wakeups == 0 (printing 'N/A' instead
of dividing by zero when a trace contains no matched wakeup/switch
pairs).
- Add argparse CLI options (-i/--input) and full type annotations.
Add a shell test
(test_wakeup_latency_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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