[PATCH RFC 0/6] Add metrics for neoverse-n2

Jing Zhang
2022-10-31T11:11:50Z

This series add six metricgroups for neoverse-n2, among which, the
formula of topdown L1 is from the document:
https://documentation-service.arm.com/static/60250c7395978b529036da86?token=

Since neoverse-n2 does not yet support topdown L2, metricgroups such
as Cache, TLB, Branch, InstructionsMix, and PEutilization are added to
help further analysis of performance bottlenecks.

with this series on neoverse-n2:

$./perf list metricgroup

List of pre-defined events (to be used in -e):

Metric Groups:

Branch
Cache
InstructionMix
PEutilization
TLB
TopDownL1

$./perf list

...
Metric Groups:

Branch:
branch_miss_pred_rate
[The rate of branches mis-predited to the overall branches]
branch_mpki
[The rate of branches mis-predicted per kilo instructions]
branch_pki
[The rate of branches retired per kilo instructions]
Cache:
l1d_cache_miss_rate
[The rate of L1 D-Cache misses to the overall L1 D-Cache]
l1d_cache_mpki
[The rate of L1 D-Cache misses per kilo instructions]
...

$sudo ./perf stat -a -M TLB sleep 1

Performance counter stats for 'system wide':

35,861,936 L1I_TLB # 0.00 itlb_walk_rate (74.91%)
5,661 ITLB_WALK (74.91%)
97,279,240 INST_RETIRED # 0.07 itlb_mpki (74.91%)
6,851 ITLB_WALK (74.91%)
26,391 DTLB_WALK # 0.00 dtlb_walk_rate (75.07%)
35,585,545 L1D_TLB (75.07%)
85,923,244 INST_RETIRED # 0.35 dtlb_mpki (75.11%)
29,992 DTLB_WALK (75.11%)

1.003450755 seconds time elapsed

Jing Zhang (6):
perf vendor events arm64: Add topdown L1 metrics for neoverse-n2
perf vendor events arm64: Add TLB metrics for neoverse-n2
perf vendor events arm64: Add cache metrics for neoverse-n2
perf vendor events arm64: Add branch metrics for neoverse-n2
perf vendor events arm64: Add PE utilization metrics for neoverse-n2
perf vendor events arm64: Add instruction mix metrics for neoverse-n2

.../arch/arm64/arm/neoverse-n2/metrics.json | 247 +++++++++++++++++++++
1 file changed, 247 insertions(+)
create mode 100644 tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json

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1.8.3.1