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<!DOCTYPE html>
<html>
<head>
<title>about:memory</title>
<script>
document.addEventListener("DOMContentLoaded", start);
function insertNode(root, report) {
let currentNode = root;
for (let path of report.path) {
if (!currentNode[path]) {
currentNode[path] = { total: 0, container: true };
}
currentNode = currentNode[path];
currentNode.total += report.size;
}
currentNode.size = report.size;
currentNode.container = false;
}
function formatBytes(bytes) {
if (bytes < 1024) {
return bytes + " B";
} else if (bytes < 1024 * 1024) {
return (bytes / 1024).toFixed(2) + " KiB";
} else if (bytes < 1024 * 1024 * 1024) {
return (bytes / (1024 * 1024)).toFixed(2) + " MiB";
} else {
return (bytes / (1024 * 1024 * 1024)).toFixed(2) + " GiB";
}
}
function formattedSize(size) {
// Use enough padding to take into account the "MiB" part.
return formatBytes(size).padStart(10);
}
function convertNodeToDOM(node, name = null) {
let result = document.createDocumentFragment();
if (node.container) {
let details = document.createElement("details");
let summary = document.createElement("summary");
summary.textContent = `${formattedSize(node.total)} -- ${name}`;
details.append(summary);
result.append(details);
// Add the children in descending order of total size.
let entries = Object.entries(node)
.filter((item) => {
return !["total", "size", "container"].includes(item[0]);
})
.sort((a, b) => b[1].total - a[1].total)
.forEach((item) =>
details.append(convertNodeToDOM(item[1], item[0]))
);
} else {
let inner = document.createElement("div");
inner.textContent = `${formattedSize(node.size)} -- ${name}`;
result.append(inner);
}
return result;
}
function reportsForProcess(processReport) {
let explicitRoot = {};
let nonExplicitRoot = {};
let jemallocHeapReportedSize = 0;
let systemHeapReportedSize = 0;
let jemallocHeapAllocatedSize = NaN;
let systemHeapAllocatedSize = NaN;
// In content processes, get the list of urls.
let urls = new Set();
processReport.reports.forEach((report) => {
if (report.path[0].startsWith("url(")) {
// This can be a list of urls.
let path_urls = report.path[0].slice(4, -1).split(", ");
path_urls.forEach((url) => urls.add(url));
}
// Add "explicit" to the start of the path, when appropriate.
if (report.kind.startsWith("Explicit")) {
report.path.unshift("explicit");
}
// Update the reported fractions of the heaps, when appropriate.
if (report.kind == "ExplicitJemallocHeapSize") {
jemallocHeapReportedSize += report.size;
} else if (report.kind == "ExplicitSystemHeapSize") {
systemHeapReportedSize += report.size;
}
// Record total size of the heaps, when we see them.
if (report.path.length == 1) {
if (report.path[0] == "jemalloc-heap-allocated") {
jemallocHeapAllocatedSize = report.size;
} else if (report.path[0] == "system-heap-allocated") {
systemHeapAllocatedSize = report.size;
}
}
// Insert this report at the proper position.
insertNode(
report.kind.startsWith("Explicit") ? explicitRoot : nonExplicitRoot,
report
);
});
// Compute and insert the heap-unclassified values.
if (!isNaN(jemallocHeapAllocatedSize)) {
insertNode(explicitRoot, {
path: ["explicit", "jemalloc-heap-unclassified"],
size: jemallocHeapAllocatedSize - jemallocHeapReportedSize,
});
}
if (!isNaN(systemHeapAllocatedSize)) {
insertNode(explicitRoot, {
path: ["explicit", "system-heap-unclassified"],
size: systemHeapAllocatedSize - systemHeapReportedSize,
});
}
// Create the DOM structure for each process report:
// <div class=process> <h4>...<h4> <pre> ...</pre> </div>
let container = document.createElement("div");
container.classList.add("process");
let reportTitle = document.createElement("h4");
reportTitle.textContent = `${
processReport.isMainProcess ? "Main Process" : "Content Process"
} (pid ${processReport.pid}) ${[...urls.values()].join(", ")}`;
container.append(reportTitle);
let reportNode = document.createElement("pre");
reportNode.classList.add("report");
container.append(reportNode);
reportNode.append(convertNodeToDOM(explicitRoot.explicit, "explicit"));
for (let prop in nonExplicitRoot) {
reportNode.append(convertNodeToDOM(nonExplicitRoot[prop], prop));
}
// Make sure we always put the main process first.
if (processReport.isMainProcess) {
window.reports.prepend(container);
} else {
window.reports.append(container);
}
}
function start() {
window.startButton.onclick = async () => {
let content = await navigator.servo.reportMemory();
let reports = JSON.parse(content);
if (reports.error) {
console.error(reports.error);
return;
}
window.reports.innerHTML = "";
window.reports.classList.remove("hidden");
if (!Array.isArray(reports)) {
console.error("Unexpected memory report format!");
return;
}
reports.forEach(reportsForProcess);
};
}
</script>
<style>
html {
font-family: sans-serif;
}
details,
details div {
margin-left: 1em;
}
summary:hover {
cursor: pointer;
}
div.process {
margin: 0.5em;
border: 2px solid gray;
border-radius: 10px;
padding: 5px;
background-color: lightgray;
}
.report {
line-height: 1.5em;
}
.report > details {
margin-bottom: 1em;
}
.hidden {
display: none;
}
</style>
</head>
<body>
<h2>Memory Reports</h2>
<button id="startButton">Measure</button>
<div id="reports" class="hidden"></div>
</body>
</html>
|
