[PATCH v6 8/9] perf test: Add tests for latency and parallelism profiling

Dmitry Vyukov
2025-02-07T11:41:32Z

Ensure basic operation of latency/parallelism profiling and that
main latency/parallelism record/report invocations don't fail/crash.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: linux-perf-users@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
tools/perf/tests/shell/base_report/setup.sh | 18 ++++++-
.../tests/shell/base_report/test_basic.sh | 52 +++++++++++++++++++
2 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/base_report/setup.sh b/tools/perf/tests/shell/base_report/setup.sh
index b03501b2e8fc5..8634e7e0dda6a 100755
--- a/tools/perf/tests/shell/base_report/setup.sh
+++ b/tools/perf/tests/shell/base_report/setup.sh
@@ -15,6 +15,8 @@
# include working environment
. ../common/init.sh

+TEST_RESULT=0
+
test -d "$HEADER_TAR_DIR" || mkdir -p "$HEADER_TAR_DIR"

SW_EVENT="cpu-clock"
@@ -26,7 +28,21 @@ PERF_EXIT_CODE=$?
CHECK_EXIT_CODE=$?

print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "prepare the perf.data file"
-TEST_RESULT=$?
+(( TEST_RESULT += $? ))
+
+# Some minimal parallel workload.
+$CMD_PERF record --latency -o $CURRENT_TEST_DIR/perf.data.1 bash -c "for i in {1..100} ; do cat /proc/cpuinfo 1> /dev/null & done; sleep 1" 2> $LOGS_DIR/setup-latency.log
+PERF_EXIT_CODE=$?
+
+echo ==================
+cat $LOGS_DIR/setup-latency.log
+echo ==================
+
+../common/check_all_patterns_found.pl "$RE_LINE_RECORD1" "$RE_LINE_RECORD2" < $LOGS_DIR/setup-latency.log
+CHECK_EXIT_CODE=$?
+
+print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "prepare the perf.data.1 file"
+(( TEST_RESULT += $? ))

print_overall_results $TEST_RESULT
exit $?
diff --git a/tools/perf/tests/shell/base_report/test_basic.sh b/tools/perf/tests/shell/base_report/test_basic.sh
index 2398eba4d3fdd..adfd8713b8f87 100755
--- a/tools/perf/tests/shell/base_report/test_basic.sh
+++ b/tools/perf/tests/shell/base_report/test_basic.sh
@@ -183,6 +183,58 @@ print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "symbol filter"
(( TEST_RESULT += $? ))

+### latency and parallelism
+
+# Record with --latency should record with context switches.
+$CMD_PERF report -i $CURRENT_TEST_DIR/perf.data.1 --stdio --header-only > $LOGS_DIR/latency_header.log
+PERF_EXIT_CODE=$?
+
+../common/check_all_patterns_found.pl ", context_switch = 1, " < $LOGS_DIR/latency_header.log
+CHECK_EXIT_CODE=$?
+
+print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "latency header"
+(( TEST_RESULT += $? ))
+
+
+# The default report for latency profile should show Overhead and Latency fields (in that order).
+$CMD_PERF report --stdio -i $CURRENT_TEST_DIR/perf.data.1 > $LOGS_DIR/latency_default.log 2> $LOGS_DIR/latency_default.err
+PERF_EXIT_CODE=$?
+
+../common/check_all_patterns_found.pl "# Overhead Latency Command" < $LOGS_DIR/latency_default.log
+CHECK_EXIT_CODE=$?
+../common/check_errors_whitelisted.pl "stderr-whitelist.txt" < $LOGS_DIR/latency_default.err
+(( CHECK_EXIT_CODE += $? ))
+
+print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "default report for latency profile"
+(( TEST_RESULT += $? ))
+
+
+# The latency report for latency profile should show Latency and Overhead fields (in that order).
+$CMD_PERF report --latency --stdio -i $CURRENT_TEST_DIR/perf.data.1 > $LOGS_DIR/latency_latency.log 2> $LOGS_DIR/latency_latency.err
+PERF_EXIT_CODE=$?
+
+../common/check_all_patterns_found.pl "# Latency Overhead Command" < $LOGS_DIR/latency_latency.log
+CHECK_EXIT_CODE=$?
+../common/check_errors_whitelisted.pl "stderr-whitelist.txt" < $LOGS_DIR/latency_latency.err
+(( CHECK_EXIT_CODE += $? ))
+
+print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "latency report for latency profile"
+(( TEST_RESULT += $? ))
+
+
+# Ensure parallelism histogram with parallelism filter does not fail/crash.
+$CMD_PERF report --hierarchy --sort latency,parallelism,comm,symbol --parallelism=1,2 --stdio -i $CURRENT_TEST_DIR/perf.data.1 > $LOGS_DIR/parallelism_hierarchy.log 2> $LOGS_DIR/parallelism_hierarchy.err
+PERF_EXIT_CODE=$?
+
+../common/check_all_patterns_found.pl "# Latency Parallelism / Command / Symbol" < $LOGS_DIR/parallelism_hierarchy.log
+CHECK_EXIT_CODE=$?
+../common/check_errors_whitelisted.pl "stderr-whitelist.txt" < $LOGS_DIR/parallelism_hierarchy.err
+(( CHECK_EXIT_CODE += $? ))
+
+print_results $PERF_EXIT_CODE $CHECK_EXIT_CODE "parallelism histogram"
+(( TEST_RESULT += $? ))
+
+
# TODO: $CMD_PERF report -n --showcpuutilization -TUxDg 2> 01.log

# print overall results