Source/JavaScriptCore/inspector/protocol/CPUProfiler.json

{
    "domain": "CPUProfiler",
    "description": "CPUProfiler domain exposes cpu usage tracking.",
    "featureGuard": "ENABLE(RESOURCE_USAGE)",
    "availability": ["web"],
    "types": [
        {
            "id": "ThreadInfo",
            "description": "CPU usage for an individual thread.",
            "type": "object",
            "properties": [
                { "name": "name", "type": "string", "description": "Some thread identification information." },
                { "name": "usage", "type": "number", "description": "CPU usage for this thread. This should not exceed 100% for an individual thread." },
                { "name": "type", "type": "string", "enum": ["main", "webkit"], "optional": true, "description": "Type of thread. There should be a single main thread." },
                { "name": "targetId", "type": "string", "optional": true, "description": "A thread may be associated with a target, such as a Worker, in the process." }
            ]
        },
        {
            "id": "Event",
            "type": "object",
            "properties": [
                { "name": "timestamp", "type": "number" },
                { "name": "usage", "type": "number", "description": "Percent of total cpu usage. If there are multiple cores the usage may be greater than 100%." },
                { "name": "threads", "type": "array", "items": { "$ref": "ThreadInfo" }, "optional": true, "description": "Per-thread CPU usage information. Does not include the main thread." }
            ]
        }
    ],
    "commands": [
        {
            "name": "startTracking",
            "description": "Start tracking cpu usage."
        },
        {
            "name": "stopTracking",
            "description": "Stop tracking cpu usage. This will produce a `trackingComplete` event."
        }
    ],
    "events": [
        {
            "name": "trackingStart",
            "description": "Tracking started.",
            "parameters": [
                { "name": "timestamp", "type": "number" }
            ]
        },
        {
            "name": "trackingUpdate",
            "description": "Periodic tracking updates with event data.",
            "parameters": [
                { "name": "event", "$ref": "Event" }
            ]
        },
        {
            "name": "trackingComplete",
            "description": "Tracking stopped.",
            "parameters": [
                { "name": "timestamp", "type": "number" }
            ]
        }
    ]
}