On my system, perf list is very slow to print the whole events. I think
there's a performance issue in SDT and uprobes event listing. I noticed
this issue while running perf test on x86 but it takes long to check
some CoreSight event which should be skipped quickly.
Anyway, some test uses perf list to check whether the required event is
available before running the test. The perf list command can take an
argument to specify event class or (glob) pattern. But glob pattern is
only to suppress output for unmatched ones after checking all events.
In this case, specifying event class is better to reduce the number of
events it checks and to avoid buggy subsystems entirely.
No functional changes intended.
Reviewed-by: James Clark <james.clark@linaro.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Carsten Haitzler <carsten.haitzler@arm.com>
Cc: Leo Yan <leo.yan@arm.com>
Link: https://lore.kernel.org/r/20241016065654.269994-1-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Add shell test to check if perf-record hangs when recording an arm_spe
event with forks.
The test FAILS if the Kernel is not patched with Commit 961c391217 ("perf:
Always wake the parent event").
Unpatched Kernel:
$ perf test -v 90
90: Check Arm SPE doesn't hang when there are forks
--- start ---
test child forked, pid 14232
Recording workload with fork
Log lines = 90 /tmp/__perf_test.stderr.0Nu0U
Log lines after 1 second = 90 /tmp/__perf_test.stderr.0Nu0U
SPE hang test: FAIL
test child finished with -1
---- end ----
Check Arm SPE trace data in workload with forks: FAILED!
Patched Kernel:
$ perf test -v 90
90: Check Arm SPE doesn't hang when there are forks
--- start ---
test child forked, pid 2930
Compiling test program...
Recording workload...
Log lines = 478 /tmp/__perf_test.log.026AI
Log lines after 1 second = 557 /tmp/__perf_test.log.026AI
SPE hang test: PASS
Cleaning up files...
test child finished with 0
---- end ----
Check Arm SPE trace data in workload with forks: Ok
Reviewed-by: James Clark <james.clark@arm.com>
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: German Gomez <german.gomez@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220228165655.3920-1-german.gomez@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
