Messages in this thread | | | From | Jing Zhang <> | Subject | [PATCH v5 0/6] Add metrics for neoverse-n2 | Date | Tue, 3 Jan 2023 19:39:30 +0800 |
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Changes since v4: - Add MPKI/PKI “ScaleUnit”; - Add acked-by from Ian Rogers; - Link: https://lore.kernel.org/all/1671799045-1108027-1-git-send-email-renyu.zj@linux.alibaba.com/
Changes since v3: - Add ipc_rate metric; - Drop the PublicDescription; - Describe PEutilization metrics in more detail; - Link: https://lore.kernel.org/all/1669310088-13482-1-git-send-email-renyu.zj@linux.alibaba.com/
Changes since v2: - Correct the furmula of Branch metrics; - Add more PE utilization metrics; - Add more TLB metrics; - Add “ScaleUnit” for some metrics; - Add a newline at the end of the file; - Link: https://lore.kernel.org/all/1668411720-3581-1-git-send-email-renyu.zj@linux.alibaba.com/
Changes since v1: - Corrected formula for topdown L1 due to wrong counts for stall_slot and stall_slot_frontend; - Link: https://lore.kernel.org/all/1667214694-89839-1-git-send-email-renyu.zj@linux.alibaba.com/
This series add six metricgroups for neoverse-n2, among which, the formula of topdown L1 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 are added to help further analysis of performance bottlenecks. 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=
$./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 -M TLB false_sharing 2
Performance counter stats for 'false_sharing 2':
31,254 L2D_TLB # 19.6 % l2_tlb_miss_rate (42.51%) 6,130 L2D_TLB_REFILL (42.51%) 1,910 L1I_TLB_REFILL # 0.1 % l1i_tlb_miss_rate (42.93%) 2,306,689 L1I_TLB (42.93%) 324,924,247 L1D_TLB # 0.0 % l1d_tlb_miss_rate (43.98%) 22,688 L1D_TLB_REFILL (43.98%) 627,992 L1I_TLB # 0.0 % itlb_walk_rate (44.26%) 92 ITLB_WALK (44.26%) 772,445,613 INST_RETIRED # 0.0 MPKI itlb_mpki (43.94%) 88 ITLB_WALK (43.94%) 907 DTLB_WALK # 0.0 % dtlb_walk_rate (43.10%) 259,132,258 L1D_TLB (43.10%) 804,080,968 INST_RETIRED # 0.0 MPKI dtlb_mpki (42.22%) 937 DTLB_WALK (42.22%)
0.479544400 seconds time elapsed
1.264233000 seconds user 0.000000000 seconds sys
$sudo ./perf stat -M TopDownL1 false_sharing 2
Performance counter stats for 'false_sharing 2':
4,310,905,590 cpu_cycles # 0.0 % bad_speculation # 4.0 % retiring (66.87%) 25,009,763,735 stall_slot (66.87%) 855,659,327 op_spec (66.87%) 854,335,288 op_retired (66.87%) 4,330,308,058 cpu_cycles # 27.1 % frontend_bound (66.99%) 10,207,186,460 stall_slot_frontend (66.99%) 4,316,583,673 cpu_cycles # 69.4 % backend_bound (66.65%) 14,979,136,808 stall_slot_backend (66.65%)
0.572056818 seconds time elapsed
1.572143000 seconds user 0.004010000 seconds sys
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 | 286 +++++++++++++++++++++ 1 file changed, 286 insertions(+) create mode 100644 tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json
-- 1.8.3.1
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