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perf test: test_intel_pt.sh: Add 9 tests
Add tests: Test with MTC and TSC disabled Test with branches disabled Test with/without CYC Test recording with sample mode Test with kernel trace Test virtual LBR Test power events Test with TNT packets disabled Test with event_trace These tests mostly check that perf record works with the corresponding Intel PT config terms, sometimes also checking that certain packets do or do not appear in the resulting trace as appropriate. The "Test virtual LBR" is slightly trickier, using a Python script to check that branch stacks are actually synthesized. Signed-off-by: Ammy Yi <ammy.yi@intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20221014170905.64069-8-adrian.hunter@intel.com Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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‎tools/perf/tests/shell/test_intel_pt.sh

Lines changed: 194 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -23,6 +23,7 @@ errfile="${temp_dir}/test-err.txt"
2323
workload="${temp_dir}/workload"
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awkscript="${temp_dir}/awkscript"
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jitdump_workload="${temp_dir}/jitdump_workload"
26+
maxbrstack="${temp_dir}/maxbrstack.py"
2627

2728
cleanup()
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{
@@ -422,14 +423,197 @@ test_jitdump()
422423
# Should be no errors
423424
if [ "${decode_err_cnt}" -ne 0 ] ; then
424425
echo "Decode failed, ${decode_err_cnt} errors"
425-
perf script -i "${perfdatafile}" --itrace=e-o-l
426+
perf script -i "${perfdatafile}" --itrace=e-o-l --show-mmap-events | cat
426427
return 1
427428
fi
428429

429430
echo OK
430431
return 0
431432
}
432433

434+
test_packet_filter()
435+
{
436+
echo "--- Test with MTC and TSC disabled ---"
437+
# Disable MTC and TSC
438+
perf_record_no_decode -o "${perfdatafile}" -e intel_pt/mtc=0,tsc=0/u uname
439+
# Should not get MTC packet
440+
mtc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "MTC 0x")
441+
if [ "${mtc_cnt}" -ne 0 ] ; then
442+
echo "Failed to filter with mtc=0"
443+
return 1
444+
fi
445+
# Should not get TSC package
446+
tsc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TSC 0x")
447+
if [ "${tsc_cnt}" -ne 0 ] ; then
448+
echo "Failed to filter with tsc=0"
449+
return 1
450+
fi
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echo OK
452+
return 0
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}
454+
455+
test_disable_branch()
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{
457+
echo "--- Test with branches disabled ---"
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# Disable branch
459+
perf_record_no_decode -o "${perfdatafile}" -e intel_pt/branch=0/u uname
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# Should not get branch related packets
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tnt_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TNT 0x")
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tip_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TIP 0x")
463+
fup_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "FUP 0x")
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if [ "${tnt_cnt}" -ne 0 ] || [ "${tip_cnt}" -ne 0 ] || [ "${fup_cnt}" -ne 0 ] ; then
465+
echo "Failed to disable branches"
466+
return 1
467+
fi
468+
echo OK
469+
return 0
470+
}
471+
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test_time_cyc()
473+
{
474+
echo "--- Test with/without CYC ---"
475+
# Check if CYC is supported
476+
cyc=$(cat /sys/bus/event_source/devices/intel_pt/caps/psb_cyc)
477+
if [ "${cyc}" != "1" ] ; then
478+
echo "SKIP: CYC is not supported"
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return 2
480+
fi
481+
# Enable CYC
482+
perf_record_no_decode -o "${perfdatafile}" -e intel_pt/cyc/u uname
483+
# should get CYC packets
484+
cyc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "CYC 0x")
485+
if [ "${cyc_cnt}" = "0" ] ; then
486+
echo "Failed to get CYC packet"
487+
return 1
488+
fi
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# Without CYC
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perf_record_no_decode -o "${perfdatafile}" -e intel_pt//u uname
491+
# Should not get CYC packets
492+
cyc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "CYC 0x")
493+
if [ "${cyc_cnt}" -gt 0 ] ; then
494+
echo "Still get CYC packet without cyc"
495+
return 1
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fi
497+
echo OK
498+
return 0
499+
}
500+
501+
test_sample()
502+
{
503+
echo "--- Test recording with sample mode ---"
504+
# Check if recording with sample mode is working
505+
if ! perf_record_no_decode -o "${perfdatafile}" --aux-sample=8192 -e '{intel_pt//u,branch-misses:u}' uname ; then
506+
echo "perf record failed with --aux-sample"
507+
return 1
508+
fi
509+
echo OK
510+
return 0
511+
}
512+
513+
test_kernel_trace()
514+
{
515+
echo "--- Test with kernel trace ---"
516+
# Check if recording with kernel trace is working
517+
can_kernel || return 2
518+
if ! perf_record_no_decode -o "${perfdatafile}" -e intel_pt//k -m1,128 uname ; then
519+
echo "perf record failed with intel_pt//k"
520+
return 1
521+
fi
522+
echo OK
523+
return 0
524+
}
525+
526+
test_virtual_lbr()
527+
{
528+
echo "--- Test virtual LBR ---"
529+
530+
# Python script to determine the maximum size of branch stacks
531+
cat << "_end_of_file_" > "${maxbrstack}"
532+
from __future__ import print_function
533+
534+
bmax = 0
535+
536+
def process_event(param_dict):
537+
if "brstack" in param_dict:
538+
brstack = param_dict["brstack"]
539+
n = len(brstack)
540+
global bmax
541+
if n > bmax:
542+
bmax = n
543+
544+
def trace_end():
545+
print("max brstack", bmax)
546+
_end_of_file_
547+
548+
# Check if virtual lbr is working
549+
perf_record_no_bpf -o "${perfdatafile}" --aux-sample -e '{intel_pt//,cycles}:u' uname
550+
times_val=$(perf script -i "${perfdatafile}" --itrace=L -s "${maxbrstack}" 2>/dev/null | grep "max brstack " | cut -d " " -f 3)
551+
case "${times_val}" in
552+
[0-9]*) ;;
553+
*) times_val=0;;
554+
esac
555+
if [ "${times_val}" -lt 2 ] ; then
556+
echo "Failed with virtual lbr"
557+
return 1
558+
fi
559+
echo OK
560+
return 0
561+
}
562+
563+
test_power_event()
564+
{
565+
echo "--- Test power events ---"
566+
# Check if power events are supported
567+
power_event=$(cat /sys/bus/event_source/devices/intel_pt/caps/power_event_trace)
568+
if [ "${power_event}" != "1" ] ; then
569+
echo "SKIP: power_event_trace is not supported"
570+
return 2
571+
fi
572+
if ! perf_record_no_decode -o "${perfdatafile}" -a -e intel_pt/pwr_evt/u uname ; then
573+
echo "perf record failed with pwr_evt"
574+
return 1
575+
fi
576+
echo OK
577+
return 0
578+
}
579+
580+
test_no_tnt()
581+
{
582+
echo "--- Test with TNT packets disabled ---"
583+
# Check if TNT disable is supported
584+
notnt=$(cat /sys/bus/event_source/devices/intel_pt/caps/tnt_disable)
585+
if [ "${notnt}" != "1" ] ; then
586+
echo "SKIP: tnt_disable is not supported"
587+
return 2
588+
fi
589+
perf_record_no_decode -o "${perfdatafile}" -e intel_pt/notnt/u uname
590+
# Should be no TNT packets
591+
tnt_cnt=$(perf script -i "${perfdatafile}" -D | grep -c TNT)
592+
if [ "${tnt_cnt}" -ne 0 ] ; then
593+
echo "TNT packets still there after notnt"
594+
return 1
595+
fi
596+
echo OK
597+
return 0
598+
}
599+
600+
test_event_trace()
601+
{
602+
echo "--- Test with event_trace ---"
603+
# Check if event_trace is supported
604+
event_trace=$(cat /sys/bus/event_source/devices/intel_pt/caps/event_trace)
605+
if [ "${event_trace}" != 1 ] ; then
606+
echo "SKIP: event_trace is not supported"
607+
return 2
608+
fi
609+
if ! perf_record_no_decode -o "${perfdatafile}" -e intel_pt/event/u uname ; then
610+
echo "perf record failed with event trace"
611+
return 1
612+
fi
613+
echo OK
614+
return 0
615+
}
616+
433617
count_result()
434618
{
435619
if [ "$1" -eq 2 ] ; then
@@ -448,6 +632,15 @@ test_system_wide_side_band || ret=$? ; count_result $ret ; ret=0
448632
test_per_thread "" "" || ret=$? ; count_result $ret ; ret=0
449633
test_per_thread "k" "(incl. kernel) " || ret=$? ; count_result $ret ; ret=0
450634
test_jitdump || ret=$? ; count_result $ret ; ret=0
635+
test_packet_filter || ret=$? ; count_result $ret ; ret=0
636+
test_disable_branch || ret=$? ; count_result $ret ; ret=0
637+
test_time_cyc || ret=$? ; count_result $ret ; ret=0
638+
test_sample || ret=$? ; count_result $ret ; ret=0
639+
test_kernel_trace || ret=$? ; count_result $ret ; ret=0
640+
test_virtual_lbr || ret=$? ; count_result $ret ; ret=0
641+
test_power_event || ret=$? ; count_result $ret ; ret=0
642+
test_no_tnt || ret=$? ; count_result $ret ; ret=0
643+
test_event_trace || ret=$? ; count_result $ret ; ret=0
451644

452645
cleanup
453646

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