tools/perf/pmu-events/arch/x86/lunarlake/frontend.json

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

File Facts

System
Linux kernel
Corpus path
tools/perf/pmu-events/arch/x86/lunarlake/frontend.json
Extension
.json
Size
35016 bytes
Lines
709
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

[
    {
        "BriefDescription": "Counts the total number of BACLEARS due to all branch types including conditional and unconditional jumps, returns, and indirect branches.",
        "Counter": "0,1,2,3,4,5,6,7",
        "EventCode": "0xe6",
        "EventName": "BACLEARS.ANY",
        "PublicDescription": "Counts the total number of BACLEARS, which occur when the Branch Target Buffer (BTB) prediction or lack thereof, was corrected by a later branch predictor in the frontend.  Includes BACLEARS due to all branch types including conditional and unconditional jumps, returns, and indirect branches.",
        "SampleAfterValue": "200003",
        "UMask": "0x1",
        "Unit": "cpu_atom"
    },
    {
        "BriefDescription": "Clears due to Unknown Branches.",
        "Counter": "0,1,2,3,4,5,6,7,8,9",
        "EventCode": "0x60",
        "EventName": "BACLEARS.ANY",
        "PublicDescription": "Number of times the front-end is resteered when it finds a branch instruction in a fetch line. This is called Unknown Branch which occurs for the first time a branch instruction is fetched or when the branch is not tracked by the BPU (Branch Prediction Unit) anymore.",
        "SampleAfterValue": "100003",
        "UMask": "0x1",
        "Unit": "cpu_core"
    },
    {
        "BriefDescription": "Counts the number of BACLEARS due to a conditional jump.",
        "Counter": "0,1,2,3,4,5,6,7",
        "EventCode": "0xe6",
        "EventName": "BACLEARS.COND",
        "SampleAfterValue": "200003",
        "UMask": "0x10",
        "Unit": "cpu_atom"
    },
    {
        "BriefDescription": "Counts the number of BACLEARS due to an indirect branch.",
        "Counter": "0,1,2,3,4,5,6,7",
        "EventCode": "0xe6",
        "EventName": "BACLEARS.INDIRECT",
        "SampleAfterValue": "200003",
        "UMask": "0x2",
        "Unit": "cpu_atom"
    },
    {
        "BriefDescription": "Counts the number of BACLEARS due to a return branch.",
        "Counter": "0,1,2,3,4,5,6,7",
        "EventCode": "0xe6",
        "EventName": "BACLEARS.RETURN",
        "SampleAfterValue": "200003",
        "UMask": "0x8",
        "Unit": "cpu_atom"
    },
    {
        "BriefDescription": "Counts the number of BACLEARS due to a direct, unconditional jump.",
        "Counter": "0,1,2,3,4,5,6,7",
        "EventCode": "0xe6",
        "EventName": "BACLEARS.UNCOND",
        "SampleAfterValue": "200003",
        "UMask": "0x4",
        "Unit": "cpu_atom"
    },
    {
        "BriefDescription": "Stalls caused by changing prefix length of the instruction.",
        "Counter": "0,1,2,3,4,5,6,7,8,9",
        "EventCode": "0x87",
        "EventName": "DECODE.LCP",
        "PublicDescription": "Counts cycles that the Instruction Length decoder (ILD) stalls occurred due to dynamically changing prefix length of the decoded instruction (by operand size prefix instruction 0x66, address size prefix instruction 0x67 or REX.W for Intel64). Count is proportional to the number of prefixes in a 16B-line. This may result in a three-cycle penalty for each LCP (Length changing prefix) in a 16-byte chunk.",
        "SampleAfterValue": "500009",
        "UMask": "0x1",
        "Unit": "cpu_core"
    },
    {
        "BriefDescription": "Cycles the Microcode Sequencer is busy.",
        "Counter": "0,1,2,3,4,5,6,7,8,9",

Annotation

Implementation Notes