Perf all metrics test fails as below when perf_event access
is restricted.
./perf test -v "perf all metrics test"
Metric 'Memory_RD_BW_Chip' not printed in:
Error:
Access to performance monitoring and observability operations is limited.
Enforced MAC policy settings (SELinux) can limit access to performance
—
access to performance monitoring and observability operations for processes
without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.
—
test child finished with -1
---- end ----
perf all metrics test: FAILED!
The perf all metrics test picks the input events from
"perf list --raw-dump metrics" and runs "perf stat -M "$m""
for each of the metrics in the list. It fails here for some
of the metrics which needs access, since it collects system
wide resource details/statistics. Fix the testcase to skip
those metric events. The check is added at two places:
- When metric is run for workload monitoring
- when metric is run for system wide.
It could happen that some of the metric events are not valid
in per-thread mode. Example from an x86 system:
$ ./perf stat -M smi_cycles true
Error:
Invalid event (msr/smi/u) in per-thread mode, enable system wide with '-a'.
The test fallbacks to system wide if first stage fails.
But when run with system wide for this metric, it hits the
issue with access restriction.
$ ./perf stat -M smi_cycles -a sleep 0.1
Error:
Access to performance monitoring and observability operations is limited.
Similar some events report not supported while running with system wide.
Example from an x86 system:
$ ./perf stat -M tma_info_system_socket_clks -a sleep 0.1
Performance counter stats for 'system wide':
<not supported> cbox_0/event=0x0/u
0.102633747 seconds time elapsed
Hence the checks for unsupported events and access restrictions is
added for both cases.
Signed-off-by: Athira Rajeev <atraj...@linux.vnet.ibm.com>
---
Changelog:
v1 -> v2:
Added the check for access restriction in workload as
well as system wide check.
tools/perf/tests/shell/stat_all_metrics.sh | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/perf/tests/shell/stat_all_metrics.sh
b/tools/perf/tests/shell/stat_all_metrics.sh
index 54774525e18a..b26420885560 100755
--- a/tools/perf/tests/shell/stat_all_metrics.sh
+++ b/tools/perf/tests/shell/stat_all_metrics.sh
@@ -1,18 +1,18 @@
#!/bin/bash
# perf all metrics test
# SPDX-License-Identifier: GPL-2.0
-
err=0
+//list="tma_info_system_socket_clks"
for m in $(perf list --raw-dump metrics); do
echo "Testing $m"
result=$(perf stat -M "$m" true 2>&1)
- if [[ "$result" =~ ${m:0:50} ]] || [[ "$result" =~ "<not supported>" ]]
+ if [[ "$result" =~ ${m:0:50} ]] || [[ "$result" =~ "<not supported>" ]] ||
[[ "$result" =~ "Access to performance monitoring and observability operations
is limited" ]]
then
continue
fi
# Failed so try system wide.
result=$(perf stat -M "$m" -a sleep 0.01 2>&1)
- if [[ "$result" =~ ${m:0:50} ]]
+ if [[ "$result" =~ ${m:0:50} ]] || [[ "$result" =~ "<not supported>" ]] ||
[[ "$result" =~ "Access to performance monitoring and observability operations
is limited" ]]
then
continue
fi
--
2.31.1
