6.12-stable review patch. If anyone has any objections, please let me know.
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From: Ilkka Koskinen ilkka@os.amperecomputing.com
[ Upstream commit 182f12f3193341c3400ae719a34c00a8a1204cff ]
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.co... Signed-off-by: Namhyung Kim namhyung@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- .../arch/arm64/ampere/ampereonex/metrics.json | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
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 c5d1d22bd034b..5228f94a793f9 100644 --- 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"