store marks and measurements flat, only create objects when needed

src/vs/base/common/performance.d.ts

@@ -21,9 +21,9 @@ export function time(name: string): { stop(): void };
 /**
  * All entries filtered by type and sorted by `startTime`.
  */
-export function getEntries(type?: 'mark' | 'measure'): PerformanceEntry[];
+export function getEntries(type: 'mark' | 'measure'): PerformanceEntry[];
 
-/**
- * Import entries
- */
-export function importEntries(entries: PerformanceEntry[]): void;
+
+type ExportData = any[];
+export function importEntries(data: ExportData): void;
+export function exportEntries(): ExportData;

src/vs/base/common/performance.js

@@ -10,6 +10,7 @@
 // This module can be loaded in an amd and commonjs-context.
 // Because we want both instances to use the same perf-data
 // we store them globally
+// stores data as 'type','name','startTime','duration'
 global._performanceEntries = global._performanceEntries || [];
 
 if (typeof define !== "function" && typeof module === "object" && typeof module.exports === "object") {
@@ -25,42 +26,35 @@ define([], function () {
 	// const _now = global.performance && performance.now ? performance.now : Date.now
 	const _now = Date.now;
 
-	class PerformanceEntry {
-		constructor(type, name, startTime, duration) {
-			this.type = type;
-			this.name = name;
-			this.startTime = startTime;
-			this.duration = duration;
-		}
-	}
-
-	function _getEntry(type, name) {
-		for (let i = global._performanceEntries.length - 1; i >= 0; i--) {
-			if (
-				(type === undefined || global._performanceEntries[i].type === type) &&
-				(name === undefined || global._performanceEntries[i].name === name)
-			) {
-				return global._performanceEntries[i];
-			}
-		}
-	}
-
 	function importEntries(entries) {
 		global._performanceEntries.splice(0, 0, ...entries);
 	}
 
-	function getEntries(type, name) {
-		return global._performanceEntries.filter(entry => {
-			return (type === undefined || entry.type === type) &&
-				(name === undefined || entry.name === name);
-		}).sort((a, b) => {
+	function exportEntries() {
+		return global._performanceEntries.splice(0);
+	}
+
+	function getEntries(type) {
+		const result = [];
+		const entries = global._performanceEntries;
+		for (let i = 0; i < entries.length; i += 4) {
+			if (entries[i] === type) {
+				result.push({
+					type: entries[i],
+					name: entries[i + 1],
+					startTime: entries[i + 2],
+					duration: entries[i + 3],
+				});
+			}
+		}
+
+		return result.sort((a, b) => {
 			return a.startTime - b.startTime;
 		});
 	}
 
 	function mark(name) {
-		const entry = new PerformanceEntry('mark', name, _now(), 0);
-		global._performanceEntries.push(entry);
+		global._performanceEntries.push('mark', name, _now(), 0);
 		if (typeof console.timeStamp === 'function') {
 			console.timeStamp(name);
 		}
@@ -81,17 +75,27 @@ define([], function () {
 		if (!from) {
 			startTime = now;
 		} else {
-			startTime = _getEntry(undefined, from).startTime;
+			startTime = _getLastStartTime(from);
 		}
 
 		if (!to) {
 			duration = now - startTime;
 		} else {
-			duration = _getEntry(undefined, to).startTime - startTime;
+			duration = _getLastStartTime(to) - startTime;
 		}
 
-		const entry = new PerformanceEntry('measure', name, startTime, duration);
-		global._performanceEntries.push(entry);
+		global._performanceEntries.push('measure', name, startTime, duration);
+	}
+
+	function _getLastStartTime(name) {
+		const entries = global._performanceEntries;
+		for (let i = entries.length - 1; i >= 0; i -= 4) {
+			if (entries[i - 2] === name) {
+				return entries[i - 1];
+			}
+		}
+
+		throw new Error(name + ' not found');
 	}
 
 	var exports = {
@@ -99,7 +103,8 @@ define([], function () {
 		measure: measure,
 		time: time,
 		getEntries: getEntries,
-		importEntries: importEntries
+		importEntries: importEntries,
+		exportEntries: exportEntries
 	};
 
 	return exports;

src/vs/code/electron-main/window.ts

@@ -26,7 +26,7 @@ import { ICodeWindow } from 'vs/platform/windows/electron-main/windows';
 import { IWorkspaceIdentifier, IWorkspacesMainService } from 'vs/platform/workspaces/common/workspaces';
 import { IBackupMainService } from 'vs/platform/backup/common/backup';
 import { ICommandAction } from 'vs/platform/actions/common/actions';
-import { mark, getEntries } from 'vs/base/common/performance';
+import { mark, exportEntries } from 'vs/base/common/performance';
 
 export interface IWindowState {
 	width?: number;
@@ -580,7 +580,7 @@ export class CodeWindow implements ICodeWindow {
 		windowConfiguration.backgroundColor = this.getBackgroundColor();
 
 		// Perf Counters
-		windowConfiguration.perfEntries = getEntries();
+		windowConfiguration.perfEntries = exportEntries();
 		windowConfiguration.perfStartTime = global.perfStartTime;
 		windowConfiguration.perfAppReady = global.perfAppReady;
 		windowConfiguration.perfWindowLoadTime = Date.now();