diff options
| author | Ravi Bangoria <ravi.bangoria@amd.com> | 2025-04-29 03:59:37 +0000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2025-04-29 22:30:46 -0300 |
| commit | fa1332a8011eebe1feefded19c94dcfdb22aacef (patch) | |
| tree | 79665768767c07493fbd52f7899526596fdee4b8 /tools/perf/tests/shell | |
| parent | fc481adc97f45328e242b6dba9fabd24f2082a6e (diff) | |
perf mem/c2c amd: Add ldlat support
'perf mem/c2c' uses IBS Op PMU on AMD platforms.
IBS Op PMU on Zen5 uarch has added support for Load Latency filtering.
Implement 'perf mem/c2c' --ldlat using IBS Op Load Latency filtering
capability.
Some subtle differences between AMD and other arch:
o --ldlat is disabled by default on AMD
o Supported values are 128 to 2048.
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Ananth Narayan <ananth.narayan@amd.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Joe Mario <jmario@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Santosh Shukla <santosh.shukla@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20250429035938.1301-4-ravi.bangoria@amd.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/tests/shell')
| -rwxr-xr-x | tools/perf/tests/shell/test_data_symbol.sh | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/tools/perf/tests/shell/test_data_symbol.sh b/tools/perf/tests/shell/test_data_symbol.sh index bbe8277496ae..d61b5659a46d 100755 --- a/tools/perf/tests/shell/test_data_symbol.sh +++ b/tools/perf/tests/shell/test_data_symbol.sh @@ -54,11 +54,34 @@ trap cleanup_files exit term int echo "Recording workload..." -# perf mem/c2c internally uses IBS PMU on AMD CPU which doesn't support -# user/kernel filtering and per-process monitoring, spin program on -# specific CPU and test in per-CPU mode. is_amd=$(grep -E -c 'vendor_id.*AuthenticAMD' /proc/cpuinfo) if (($is_amd >= 1)); then + mem_events="$(perf mem record -v -e list 2>&1)" + if ! [[ "$mem_events" =~ ^mem\-ldst.*ibs_op/(.*)/.*available ]]; then + echo "ERROR: mem-ldst event is not matching" + exit 1 + fi + + # --ldlat on AMD: + # o Zen4 and earlier uarch does not support ldlat + # o Even on supported platforms, it's disabled (--ldlat=0) by default. + ldlat=${BASH_REMATCH[1]} + if [[ -n $ldlat ]]; then + if ! [[ "$ldlat" =~ ldlat=0 ]]; then + echo "ERROR: ldlat not initialized to 0?" + exit 1 + fi + + mem_events="$(perf mem record -v --ldlat=150 -e list 2>&1)" + if ! [[ "$mem_events" =~ ^mem-ldst.*ibs_op/ldlat=150/.*available ]]; then + echo "ERROR: --ldlat not honored?" + exit 1 + fi + fi + + # perf mem/c2c internally uses IBS PMU on AMD CPU which doesn't + # support user/kernel filtering and per-process monitoring on older + # kernels, spin program on specific CPU and test in per-CPU mode. perf mem record -vvv -o ${PERF_DATA} -C 0 -- taskset -c 0 $TEST_PROGRAM 2>"${ERR_FILE}" else perf mem record -vvv --all-user -o ${PERF_DATA} -- $TEST_PROGRAM 2>"${ERR_FILE}" |