tools/perf/pmu-events/arch/arm64/arm/neoverse-n3/stall.json

Source file repositories/reference/linux-study-clean/tools/perf/pmu-events/arch/arm64/arm/neoverse-n3/stall.json

File Facts

System
Linux kernel
Corpus path
tools/perf/pmu-events/arch/arm64/arm/neoverse-n3/stall.json
Extension
.json
Size
5473 bytes
Lines
87
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

[
    {
        "ArchStdEvent": "STALL_FRONTEND",
        "PublicDescription": "Counts cycles when frontend could not send any micro-operations to the rename stage because of frontend resource stalls caused by fetch memory latency or branch prediction flow stalls. STALL_FRONTEND_SLOTS counts SLOTS during the cycle when this event counts."
    },
    {
        "ArchStdEvent": "STALL_BACKEND",
        "PublicDescription": "Counts cycles whenever the rename unit is unable to send any micro-operations to the backend of the pipeline because of backend resource constraints. Backend resource constraints can include issue stage fullness, execution stage fullness, or other internal pipeline resource fullness. All the backend slots were empty during the cycle when this event counts."
    },
    {
        "ArchStdEvent": "STALL",
        "PublicDescription": "Counts cycles when no operations are sent to the rename unit from the frontend or from the rename unit to the backend for any reason (either frontend or backend stall). This event is the sum of STALL_FRONTEND and STALL_BACKEND"
    },
    {
        "ArchStdEvent": "STALL_SLOT_BACKEND",
        "PublicDescription": "Counts slots per cycle in which no operations are sent from the rename unit to the backend due to backend resource constraints. STALL_BACKEND counts during the cycle when STALL_SLOT_BACKEND counts at least 1."
    },
    {
        "ArchStdEvent": "STALL_SLOT_FRONTEND",
        "PublicDescription": "Counts slots per cycle in which no operations are sent to the rename unit from the frontend due to frontend resource constraints."
    },
    {
        "ArchStdEvent": "STALL_SLOT",
        "PublicDescription": "Counts slots per cycle in which no operations are sent to the rename unit from the frontend or from the rename unit to the backend for any reason (either frontend or backend stall). STALL_SLOT is the sum of STALL_SLOT_FRONTEND and STALL_SLOT_BACKEND."
    },
    {
        "ArchStdEvent": "STALL_BACKEND_MEM",
        "PublicDescription": "Counts cycles when the backend is stalled because there is a pending demand load request in progress in the last level core cache."
    },
    {
        "ArchStdEvent": "STALL_FRONTEND_MEMBOUND",
        "PublicDescription": "Counts cycles when the frontend could not send any micro-operations to the rename stage due to resource constraints in the memory resources."
    },
    {
        "ArchStdEvent": "STALL_FRONTEND_L1I",
        "PublicDescription": "Counts cycles when the frontend is stalled because there is an instruction fetch request pending in the level 1 instruction cache."
    },
    {
        "ArchStdEvent": "STALL_FRONTEND_MEM",
        "PublicDescription": "Counts cycles when the frontend is stalled because there is an instruction fetch request pending in the last level core cache."
    },
    {
        "ArchStdEvent": "STALL_FRONTEND_TLB",
        "PublicDescription": "Counts when the frontend is stalled on any TLB misses being handled. This event also counts the TLB accesses made by hardware prefetches."
    },
    {
        "ArchStdEvent": "STALL_FRONTEND_CPUBOUND",
        "PublicDescription": "Counts cycles when the frontend could not send any micro-operations to the rename stage due to resource constraints in the CPU resources excluding memory resources."
    },
    {
        "ArchStdEvent": "STALL_FRONTEND_FLOW",
        "PublicDescription": "Counts cycles when the frontend could not send any micro-operations to the rename stage due to resource constraints in the branch prediction unit."
    },
    {
        "ArchStdEvent": "STALL_FRONTEND_FLUSH",
        "PublicDescription": "Counts cycles when the frontend could not send any micro-operations to the rename stage as the frontend is recovering from a machine flush or resteer. Example scenarios that cause a flush include branch mispredictions, taken exceptions, micro-architectural flush etc."
    },
    {
        "ArchStdEvent": "STALL_BACKEND_MEMBOUND",
        "PublicDescription": "Counts cycles when the backend could not accept any micro-operations due to resource constraints in the memory resources."
    },
    {
        "ArchStdEvent": "STALL_BACKEND_L1D",
        "PublicDescription": "Counts cycles when the backend is stalled because there is a pending demand load request in progress in the level 1 data cache."
    },
    {
        "ArchStdEvent": "STALL_BACKEND_TLB",
        "PublicDescription": "Counts cycles when the backend is stalled on any demand TLB misses being handled."
    },
    {

Annotation

Implementation Notes