[PATCH v3 1/6] perf vendor events arm64: Add topdown L1 metrics for neoverse-n2
From: Jing Zhang <renyu.zj@linux.alibaba.com>
Date: 2022-11-24 17:15:09
Also in:
linux-perf-users, lkml
Subsystem:
performance events subsystem, performance events tooling arm64, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
The formula of topdown L1 on neoverse-n2 is from ARM sbsa7.0 platform design document [0], D37-38. However, due to the wrong count of stall_slot and stall_slot_frontend on neoverse-n2, the real stall_slot and real stall_slot_frontend need to subtract cpu_cycles, so correct the expression of topdown metrics. Reference from ARM neoverse-n2 errata notice [1], D117. Since neoverse-n2 does not yet support topdown L2, metricgroups such as Cache, TLB, Branch, InstructionsMix, and PEutilization will be added to further analysis of performance bottlenecks in the following patches. Reference from ARM PMU guide [2][3]. [0] https://documentation-service.arm.com/static/60250c7395978b529036da86?token= [1] https://documentation-service.arm.com/static/636a66a64e6cf12278ad89cb?token= [2] https://documentation-service.arm.com/static/628f8fa3dfaf015c2b76eae8?token= [3] https://documentation-service.arm.com/static/62cfe21e31ea212bb6627393?token= Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com> --- .../arch/arm64/arm/neoverse-n2/metrics.json | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json
diff --git a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json
new file mode 100644
index 0000000..8628140
--- /dev/null
+++ b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json@@ -0,0 +1,34 @@ +[ + { + "MetricExpr": "(stall_slot_frontend - cpu_cycles) / (5 * cpu_cycles)", + "PublicDescription": "Frontend bound L1 topdown metric", + "BriefDescription": "Frontend bound L1 topdown metric", + "MetricGroup": "TopdownL1", + "MetricName": "frontend_bound", + "ScaleUnit": "100%" + }, + { + "MetricExpr": "(1 - op_retired / op_spec) * (1 - (stall_slot - cpu_cycles) / (5 * cpu_cycles))", + "PublicDescription": "Bad speculation L1 topdown metric", + "BriefDescription": "Bad speculation L1 topdown metric", + "MetricGroup": "TopdownL1", + "MetricName": "bad_speculation", + "ScaleUnit": "100%" + }, + { + "MetricExpr": "(op_retired / op_spec) * (1 - (stall_slot - cpu_cycles) / (5 * cpu_cycles))", + "PublicDescription": "Retiring L1 topdown metric", + "BriefDescription": "Retiring L1 topdown metric", + "MetricGroup": "TopdownL1", + "MetricName": "retiring", + "ScaleUnit": "100%" + }, + { + "MetricExpr": "stall_slot_backend / (5 * cpu_cycles)", + "PublicDescription": "Backend Bound L1 topdown metric", + "BriefDescription": "Backend Bound L1 topdown metric", + "MetricGroup": "TopdownL1", + "MetricName": "backend_bound", + "ScaleUnit": "100%" + } +]
--
1.8.3.1
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