fix #42144

src/vs/platform/actions/test/common/menuService.test.ts

@@ -48,6 +48,10 @@ class MockExtensionService implements IExtensionService {
 		throw new Error('Not implemented');
 	}
 
+	public canProfileExtensionHost() {
+		return false;
+	}
+
 	public startExtensionHostProfile(): TPromise<ProfileSession> {
 		throw new Error('Not implemented');
 	}

src/vs/platform/commands/test/commandService.test.ts

@@ -43,6 +43,9 @@ class SimpleExtensionService implements IExtensionService {
 	getExtensions(): TPromise<IExtensionDescription[]> {
 		return TPromise.wrap([]);
 	}
+	canProfileExtensionHost() {
+		return false;
+	}
 	startExtensionHostProfile(): TPromise<ProfileSession> {
 		throw new Error('Not implemented');
 	}

src/vs/platform/extensions/common/extensions.ts

@@ -169,6 +169,11 @@ export interface IExtensionService {
 	 */
 	getExtensionsStatus(): { [id: string]: IExtensionsStatus };
 
+	/**
+	 * Check if the extension host can be profiled.
+	 */
+	canProfileExtensionHost(): boolean;
+
 	/**
 	 * Begin an extension host process profile session.
 	 */

src/vs/workbench/parts/extensions/electron-browser/extensionProfileService.ts

@@ -16,6 +16,7 @@ import { StatusbarAlignment, IStatusbarRegistry, StatusbarItemDescriptor, Extens
 import { Registry } from 'vs/platform/registry/common/platform';
 import { IExtensionHostProfileService, ProfileSessionState, RuntimeExtensionsInput } from 'vs/workbench/parts/extensions/electron-browser/runtimeExtensionsEditor';
 import { IWorkbenchEditorService } from 'vs/workbench/services/editor/common/editorService';
+import { IMessageService, Severity } from 'vs/platform/message/common/message';
 
 export class ExtensionHostProfileService extends Disposable implements IExtensionHostProfileService {
 
@@ -38,6 +39,7 @@ export class ExtensionHostProfileService extends Disposable implements IExtensio
 		@IExtensionService private readonly _extensionService: IExtensionService,
 		@IWorkbenchEditorService private readonly _editorService: IWorkbenchEditorService,
 		@IInstantiationService private readonly _instantiationService: IInstantiationService,
+		@IMessageService private readonly _messageService: IMessageService
 	) {
 		super();
 		this._profile = null;
@@ -67,6 +69,12 @@ export class ExtensionHostProfileService extends Disposable implements IExtensio
 		if (this._state !== ProfileSessionState.None) {
 			return;
 		}
+
+		if (!this._extensionService.canProfileExtensionHost()) {
+			this._messageService.show(Severity.Info, nls.localize('noPro', "To profile extensions, launch with `--inspect-extensions=<port>`."));
+			return;
+		}
+
 		this._setState(ProfileSessionState.Starting);
 
 		this._extensionService.startExtensionHostProfile().then((value) => {

src/vs/workbench/services/extensions/electron-browser/extensionHost.ts

@@ -275,6 +275,8 @@ export class ExtensionHostProcessWorker {
 		let startPort = 9333;
 		if (typeof this._environmentService.debugExtensionHost.port === 'number') {
 			startPort = expected = this._environmentService.debugExtensionHost.port;
+		} else {
+			return TPromise.as({ expected: undefined, actual: 0 });
 		}
 		return new TPromise((c, e) => {
 			return findFreePort(startPort, 10 /* try 10 ports */, 5000 /* try up to 5 seconds */).then(port => {

src/vs/workbench/services/extensions/electron-browser/extensionHostProfiler.ts

@@ -7,15 +7,8 @@
 
 import { IExtensionService, IExtensionDescription, ProfileSession, IExtensionHostProfile, ProfileSegmentId } from 'vs/platform/extensions/common/extensions';
 import { TPromise } from 'vs/base/common/winjs.base';
-import { localize } from 'vs/nls';
 import { TernarySearchTree } from 'vs/base/common/map';
 import { realpathSync } from 'vs/base/node/extfs';
-import { CommandsRegistry } from 'vs/platform/commands/common/commands';
-import { IStatusbarService, StatusbarAlignment } from 'vs/platform/statusbar/common/statusbar';
-import { writeFile } from 'vs/base/node/pfs';
-import * as path from 'path';
-import { IEnvironmentService } from 'vs/platform/environment/common/environment';
-import { setTimeout } from 'timers';
 import { Profile, ProfileNode } from 'v8-inspect-profiler';
 
 export class ExtensionHostProfiler {
@@ -128,27 +121,3 @@ export class ExtensionHostProfiler {
 		};
 	}
 }
-
-
-CommandsRegistry.registerCommand('exthost.profile.start', async accessor => {
-	const statusbarService = accessor.get(IStatusbarService);
-	const extensionService = accessor.get(IExtensionService);
-	const environmentService = accessor.get(IEnvironmentService);
-
-	const handle = statusbarService.addEntry({ text: localize('message', "$(zap) Profiling Extension Host...") }, StatusbarAlignment.LEFT);
-
-	extensionService.startExtensionHostProfile().then(session => {
-		setTimeout(() => {
-			session.stop().then(result => {
-				result.getAggregatedTimes().forEach((val, index) => {
-					console.log(`${index} : ${Math.round(val / 1000)} ms`);
-				});
-				let profilePath = path.join(environmentService.userHome, 'extHostProfile.cpuprofile');
-				console.log(`Saving profile at ${profilePath}`);
-				return writeFile(profilePath, JSON.stringify(result.data));
-			}).then(() => {
-				handle.dispose();
-			});
-		}, 5000);
-	});
-});

src/vs/workbench/services/extensions/electron-browser/extensionService.ts

@@ -337,6 +337,10 @@ export class ExtensionService extends Disposable implements IExtensionService {
 		return result;
 	}
 
+	public canProfileExtensionHost(): boolean {
+		return this._extensionHostProcessWorker && Boolean(this._extensionHostProcessWorker.getInspectPort());
+	}
+
 	public startExtensionHostProfile(): TPromise<ProfileSession> {
 		if (this._extensionHostProcessWorker) {
 			let port = this._extensionHostProcessWorker.getInspectPort();