Add an input latency contrib that will do the reporting

Author: Tyriar

src/vs/base/browser/performance.ts

@@ -130,21 +130,20 @@ export namespace inputLatency {
 				measurementsRender[measurementsCount] = performance.getEntriesByName('render')[0].duration;
 				measurementsInputLatency[measurementsCount] = performance.getEntriesByName('inputlatency')[0].duration;
 
-				console.info(
-					`input latency=${measurementsInputLatency[measurementsCount].toFixed(1)} [` +
-					`keydown=${measurementsKeydown[measurementsCount].toFixed(1)}, ` +
-					`input=${measurementsInput[measurementsCount].toFixed(1)}, ` +
-					`render=${measurementsRender[measurementsCount].toFixed(1)}` +
-					`]`
-				);
+				// console.info(
+				// 	`input latency=${measurementsInputLatency[measurementsCount].toFixed(1)} [` +
+				// 	`keydown=${measurementsKeydown[measurementsCount].toFixed(1)}, ` +
+				// 	`input=${measurementsInput[measurementsCount].toFixed(1)}, ` +
+				// 	`render=${measurementsRender[measurementsCount].toFixed(1)}` +
+				// 	`]`
+				// );
 
 				measurementsCount++;
 
 				reset();
 			}
 		});
 	}
-	setInterval(() => console.log(getAndClearMeasurements()), 10000);
 
 	/**
 	 * Clear the current sample.

src/vs/workbench/contrib/performance/browser/inputLatencyContrib.ts

@@ -0,0 +1,39 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { inputLatency } from 'vs/base/browser/performance';
+import { RunOnceScheduler } from 'vs/base/common/async';
+import { Event } from 'vs/base/common/event';
+import { Disposable, MutableDisposable } from 'vs/base/common/lifecycle';
+import { IWorkbenchContribution } from 'vs/workbench/common/contributions';
+import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
+
+export class InputLatencyContrib extends Disposable implements IWorkbenchContribution {
+	private readonly _listener = this._register(new MutableDisposable());
+	private readonly _scheduler: RunOnceScheduler;
+
+	constructor(
+		@IEditorService private readonly _editorService: IEditorService
+	) {
+		super();
+
+		// The current sampling strategy is when the active editor changes, start sampling and
+		// report the results after 60 seconds. It's done this way as we don't want to sample
+		// everything, just somewhat randomly, and using an interval would utilize CPU when the
+		// application is inactive.
+		this._scheduler = this._register(new RunOnceScheduler(() => {
+			const measurements = inputLatency.getAndClearMeasurements();
+			console.log('measurements', measurements);
+			// Listen for the next editor change
+			this._setupListener();
+		}, 60000));
+
+		this._setupListener();
+	}
+
+	private _setupListener(): void {
+		this._listener.value = Event.once(this._editorService.onDidActiveEditorChange)(() => this._scheduler.schedule());
+	}
+}

src/vs/workbench/contrib/performance/browser/performance.contribution.ts

@@ -15,6 +15,7 @@ import { PerfviewContrib, PerfviewInput } from 'vs/workbench/contrib/performance
 import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
 import { InstantiationService, Trace } from 'vs/platform/instantiation/common/instantiationService';
 import { EventProfiling } from 'vs/base/common/event';
+import { InputLatencyContrib } from 'vs/workbench/contrib/performance/browser/inputLatencyContrib';
 
 // -- startup performance view
 
@@ -127,3 +128,11 @@ registerAction2(class PrintEventProfiling extends Action2 {
 		}
 	}
 });
+
+// -- input latency
+
+
+Registry.as<IWorkbenchContributionsRegistry>(Extensions.Workbench).registerWorkbenchContribution(
+	InputLatencyContrib,
+	LifecyclePhase.Eventually
+);