Re: [PATCH v5 2/6] perf vendor events arm64: Add TLB metrics for neoverse-n2
From: Ian Rogers <irogers@google.com>
Date: 2023-01-03 17:15:45
Also in:
linux-perf-users, lkml
On Tue, Jan 3, 2023 at 3:39 AM Jing Zhang [off-list ref] wrote:
quoted hunk ↗ jump to hunk
Add TLB related metrics. Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com> Acked-by: Ian Rogers <irogers@google.com> --- .../arch/arm64/arm/neoverse-n2/metrics.json | 49 ++++++++++++++++++++++ 1 file changed, 49 insertions(+)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 index c126f1bc..8a74e07 100644 --- a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json +++ b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json@@ -26,5 +26,54 @@ "MetricGroup": "TopdownL1", "MetricName": "backend_bound", "ScaleUnit": "100%" + }, + { + "MetricExpr": "L1D_TLB_REFILL / L1D_TLB", + "BriefDescription": "The rate of L1D TLB refill to the overall L1D TLB lookups", + "MetricGroup": "TLB", + "MetricName": "l1d_tlb_miss_rate", + "ScaleUnit": "100%" + }, + { + "MetricExpr": "L1I_TLB_REFILL / L1I_TLB", + "BriefDescription": "The rate of L1I TLB refill to the overall L1I TLB lookups", + "MetricGroup": "TLB", + "MetricName": "l1i_tlb_miss_rate", + "ScaleUnit": "100%" + }, + { + "MetricExpr": "L2D_TLB_REFILL / L2D_TLB", + "BriefDescription": "The rate of L2D TLB refill to the overall L2D TLB lookups", + "MetricGroup": "TLB", + "MetricName": "l2_tlb_miss_rate", + "ScaleUnit": "100%" + }, + { + "MetricExpr": "DTLB_WALK / INST_RETIRED * 1000", + "BriefDescription": "The rate of TLB Walks per kilo instructions for data accesses", + "MetricGroup": "TLB", + "MetricName": "dtlb_mpki", + "ScaleUnit": "MPKI" + }, + { + "MetricExpr": "DTLB_WALK / L1D_TLB", + "BriefDescription": "The rate of DTLB Walks to the overall L1D TLB lookups", + "MetricGroup": "TLB", + "MetricName": "dtlb_walk_rate", + "ScaleUnit": "100%" + }, + { + "MetricExpr": "ITLB_WALK / INST_RETIRED * 1000", + "BriefDescription": "The rate of TLB Walks per kilo instructions for instruction accesses", + "MetricGroup": "TLB", + "MetricName": "itlb_mpki", + "ScaleUnit": "MPKI"
Did you test this? IIRC if there is no number in the ScaleUnit then the scale factor becomes 0 and the metric value is always multiplied by zero. Perhaps: "MetricName": "itlb_miss_rate", "MetricExpr": "ITLB / INST_RETIRED" "ScaleUnit": "1000MPKI" Thanks, Ian
+ },
+ {
+ "MetricExpr": "ITLB_WALK / L1I_TLB",
+ "BriefDescription": "The rate of ITLB Walks to the overall L1I TLB lookups",
+ "MetricGroup": "TLB",
+ "MetricName": "itlb_walk_rate",
+ "ScaleUnit": "100%"
}
]
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