perf vendor events arm64 AmpereOneX: Fix frontend_bound calculation

frontend_bound metrics was miscalculated due to different scaling in
a couple of metrics it depends on. Change the scaling to match with
AmpereOne.

Fixes: 16438b652b46 ("perf vendor events arm64 AmpereOneX: Add core PMU events and metrics")
Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20250313201559.11332-3-ilkka@os.amperecomputing.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/perf/pmu-events/arch/arm64/ampere/ampereonex/metrics.json b/tools/perf/pmu-events/arch/arm64/ampere/ampereonex/metrics.json
index c5d1d22bd034b10a8220e12b4d9b917d2f6d2ffa..5228f94a793f95e0223dbe00b27bb67115e76f60 100644 (file)
--- a/tools/perf/pmu-events/arch/arm64/ampere/ampereonex/metrics.json
+++ b/tools/perf/pmu-events/arch/arm64/ampere/ampereonex/metrics.json
@@ -229,19 +229,19 @@
     },
     {
         "MetricName": "slots_lost_misspeculation_fraction",
-        "MetricExpr": "(OP_SPEC - OP_RETIRED) / (CPU_CYCLES * #slots)",
+        "MetricExpr": "100 * (OP_SPEC - OP_RETIRED) / (CPU_CYCLES * #slots)",
         "BriefDescription": "Fraction of slots lost due to misspeculation",
         "DefaultMetricgroupName": "TopdownL1",
         "MetricGroup": "Default;TopdownL1",
-        "ScaleUnit": "100percent of slots"
+        "ScaleUnit": "1percent of slots"
     },
     {
         "MetricName": "retired_fraction",
-        "MetricExpr": "OP_RETIRED / (CPU_CYCLES * #slots)",
+        "MetricExpr": "100 * OP_RETIRED / (CPU_CYCLES * #slots)",
         "BriefDescription": "Fraction of slots retiring, useful work",
         "DefaultMetricgroupName": "TopdownL1",
         "MetricGroup": "Default;TopdownL1",
-        "ScaleUnit": "100percent of slots"
+        "ScaleUnit": "1percent of slots"
     },
     {
         "MetricName": "backend_core",
@@ -266,7 +266,7 @@
     },
     {
         "MetricName": "frontend_bandwidth",
-        "MetricExpr": "frontend_bound - frontend_latency",
+        "MetricExpr": "frontend_bound - 100 * frontend_latency",
         "BriefDescription": "Fraction of slots the CPU did not dispatch at full bandwidth - able to dispatch partial slots only (1, 2, or 3 uops)",
         "MetricGroup": "TopdownL2",
         "ScaleUnit": "1percent of slots"