tools/perf/pmu-events/arch/x86/amdzen5/pipeline.json

Source file repositories/reference/linux-study-clean/tools/perf/pmu-events/arch/x86/amdzen5/pipeline.json

File Facts

System
Linux kernel
Corpus path
tools/perf/pmu-events/arch/x86/amdzen5/pipeline.json
Extension
.json
Size
4655 bytes
Lines
100
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

[
  {
    "MetricName": "total_dispatch_slots",
    "BriefDescription": "Total dispatch slots (up to 8 instructions can be dispatched in each cycle).",
    "MetricExpr": "8 * ls_not_halted_cyc",
    "ScaleUnit": "1slots"
  },
  {
    "MetricName": "frontend_bound",
    "BriefDescription": "Percentage of dispatch slots that remained unused because the frontend did not supply enough instructions/ops.",
    "MetricExpr": "d_ratio(de_no_dispatch_per_slot.no_ops_from_frontend, total_dispatch_slots)",
    "MetricGroup": "PipelineL1",
    "ScaleUnit": "100%slots"
  },
  {
    "MetricName": "bad_speculation",
    "BriefDescription": "Percentage of dispatched ops that did not retire.",
    "MetricExpr": "d_ratio(de_src_op_disp.all - ex_ret_ops, total_dispatch_slots)",
    "MetricGroup": "PipelineL1",
    "ScaleUnit": "100%ops"
  },
  {
    "MetricName": "backend_bound",
    "BriefDescription": "Percentage of dispatch slots that remained unused because of backend stalls.",
    "MetricExpr": "d_ratio(de_no_dispatch_per_slot.backend_stalls, total_dispatch_slots)",
    "MetricGroup": "PipelineL1",
    "ScaleUnit": "100%slots"
  },
  {
    "MetricName": "smt_contention",
    "BriefDescription": "Percentage of dispatch slots that remained unused because the other thread was selected.",
    "MetricExpr": "d_ratio(de_no_dispatch_per_slot.smt_contention, total_dispatch_slots)",
    "MetricGroup": "PipelineL1",
    "ScaleUnit": "100%slots"
  },
  {
    "MetricName": "retiring",
    "BriefDescription": "Percentage of dispatch slots used by ops that retired.",
    "MetricExpr": "d_ratio(ex_ret_ops, total_dispatch_slots)",
    "MetricGroup": "PipelineL1",
    "ScaleUnit": "100%slots"
  },
  {
    "MetricName": "frontend_bound_by_latency",
    "BriefDescription": "Percentage of dispatch slots that remained unused because of a latency bottleneck in the frontend (such as instruction cache or TLB misses).",
    "MetricExpr": "d_ratio((8 * cpu@de_no_dispatch_per_slot.no_ops_from_frontend\\,cmask\\=0x8@), total_dispatch_slots)",
    "MetricGroup": "PipelineL2;frontend_bound_group",
    "ScaleUnit": "100%slots"
  },
  {
    "MetricName": "frontend_bound_by_bandwidth",
    "BriefDescription": "Percentage of dispatch slots that remained unused because of a bandwidth bottleneck in the frontend (such as decode or op cache fetch bandwidth).",
    "MetricExpr": "d_ratio(de_no_dispatch_per_slot.no_ops_from_frontend - (8 * cpu@de_no_dispatch_per_slot.no_ops_from_frontend\\,cmask\\=0x8@), total_dispatch_slots)",
    "MetricGroup": "PipelineL2;frontend_bound_group",
    "ScaleUnit": "100%slots"
  },
  {
    "MetricName": "bad_speculation_from_mispredicts",
    "BriefDescription": "Percentage of dispatched ops that were flushed due to branch mispredicts.",
    "MetricExpr": "d_ratio(bad_speculation * ex_ret_brn_misp, ex_ret_brn_misp + bp_redirects.resync)",
    "MetricGroup": "PipelineL2;bad_speculation_group",
    "ScaleUnit": "100%ops"
  },
  {
    "MetricName": "bad_speculation_from_pipeline_restarts",
    "BriefDescription": "Percentage of dispatched ops that were flushed due to pipeline restarts (resyncs).",
    "MetricExpr": "d_ratio(bad_speculation * bp_redirects.resync, ex_ret_brn_misp + bp_redirects.resync)",
    "MetricGroup": "PipelineL2;bad_speculation_group",
    "ScaleUnit": "100%ops"
  },

Annotation

Implementation Notes