Source/JavaScriptCore/inspector/protocol/Memory.json

{
    "domain": "Memory",
    "description": "Memory domain exposes page memory tracking.",
    "featureGuard": "ENABLE(RESOURCE_USAGE)",
    "availability": "web",
    "types": [
        {
            "id": "Event",
            "type": "object",
            "properties": [
                { "name": "timestamp", "type": "number" },
                { "name": "categories", "type": "array", "items": { "$ref": "CategoryData" }, "description": "Breakdown of memory in categories." }
            ]
        },
        {
            "id": "CategoryData",
            "type": "object",
            "properties": [
                { "name": "type", "type": "string", "enum": ["javascript", "jit", "images", "layers", "page", "other"], "description": "Category type." },
                { "name": "size", "type": "number", "description": "Category size in bytes." }
            ]
        }
    ],
    "commands": [
        {
            "name": "enable",
            "description": "Enables Memory domain events."
        },
        {
            "name": "disable",
            "description": "Disables Memory domain events."
        },
        {
            "name": "startTracking",
            "description": "Start tracking memory. This will produce a `trackingStart` event."
        },
        {
            "name": "stopTracking",
            "description": "Stop tracking memory. This will produce a `trackingComplete` event."
        }
    ],
    "events": [
        {
            "name": "memoryPressure",
            "description": "Memory pressure was encountered.",
            "parameters": [
                { "name": "timestamp", "type": "number" },
                { "name": "severity", "type": "string", "enum": ["critical", "non-critical"], "description": "The severity of the memory pressure event." }
            ]
        },
        {
            "name": "trackingStart",
            "description": "Tracking started.",
            "parameters": [
                { "name": "timestamp", "type": "number" }
            ]
        },
        {
            "name": "trackingUpdate",
            "description": "Periodic tracking updates with event data.",
            "parameters": [
                { "name": "event", "$ref": "Event" }
            ]
        },
        {
            "name": "trackingComplete",
            "description": "Tracking stopped."
        }
    ]
}