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Marks when Scheduler starts and stops running a task. Also marks when a task is initially scheduled, and when Scheduler is waiting for a callback, which can't be inferred from a sample-based JavaScript CPU profile alone. The plan is to use the user-timing events to build a Scheduler profiler that shows how the lifetime of tasks interact with each other and with unscheduled main thread work. The test suite works by printing an text representation of a Scheduler flamegraph.
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| Original file line number | Diff line number | Diff line change |
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| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow | ||
| */ | ||
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| export type PriorityLevel = 1 | 2 | 3 | 4 | 5; | ||
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| // TODO: Use symbols? | ||
| export const ImmediatePriority = 1; | ||
| export const UserBlockingPriority = 2; | ||
| export const NormalPriority = 3; | ||
| export const LowPriority = 4; | ||
| export const IdlePriority = 5; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow | ||
| */ | ||
|
|
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| import type {PriorityLevel} from './SchedulerPriorities'; | ||
| import {enableProfiling as enableProfilingFeatureFlag} from './SchedulerFeatureFlags'; | ||
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| const enableProfiling = | ||
| enableProfilingFeatureFlag && | ||
| typeof performance !== 'undefined' && | ||
| typeof performance.mark === 'function' && | ||
| typeof performance.clearMarks === 'function'; | ||
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| let runIdCounter: number = 0; | ||
| let mainThreadIdCounter: number = 0; | ||
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| export function markTaskStart(task: {id: number}) { | ||
| if (enableProfiling) { | ||
| // Use extra field to track if delayed task starts. | ||
| const taskStartMark = `SchedulerTask-${task.id}-Start`; | ||
| performance.mark(taskStartMark); | ||
| performance.clearMarks(taskStartMark); | ||
| } | ||
| } | ||
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| export function markTaskCompleted(task: { | ||
| id: number, | ||
| priorityLevel: PriorityLevel, | ||
| label?: string, | ||
| }) { | ||
| if (enableProfiling) { | ||
| const info = JSON.stringify({ | ||
| priorityLevel: task.priorityLevel, | ||
| label: task.label, | ||
| exitStatus: 'completed', | ||
| }); | ||
| const taskEndMark = `SchedulerTask-${task.id}-End-${info}`; | ||
| performance.mark(taskEndMark); | ||
| performance.clearMarks(taskEndMark); | ||
| } | ||
| } | ||
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| export function markTaskCanceled(task: { | ||
| id: number, | ||
| priorityLevel: PriorityLevel, | ||
| label?: string, | ||
| }) { | ||
| if (enableProfiling) { | ||
| const info = JSON.stringify({ | ||
| priorityLevel: task.priorityLevel, | ||
| label: task.label, | ||
| exitStatus: 'canceled', | ||
| }); | ||
| const taskEndMark = `SchedulerTask-${task.id}-End-${info}`; | ||
| performance.mark(taskEndMark); | ||
| performance.clearMarks(taskEndMark); | ||
| } | ||
| } | ||
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| export function markTaskErrored(task: { | ||
| id: number, | ||
| priorityLevel: PriorityLevel, | ||
| label?: string, | ||
| }) { | ||
| if (enableProfiling) { | ||
| const info = JSON.stringify({ | ||
| priorityLevel: task.priorityLevel, | ||
| label: task.label, | ||
| exitStatus: 'errored', | ||
| }); | ||
| const taskEndMark = `SchedulerTask-${task.id}-End-${info}`; | ||
| performance.mark(taskEndMark); | ||
| performance.clearMarks(taskEndMark); | ||
| } | ||
| } | ||
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| export function markTaskRun(task: {id: number}) { | ||
| if (enableProfiling) { | ||
| runIdCounter++; | ||
| const runMark = `SchedulerTask-${task.id}-Run-${runIdCounter}`; | ||
| performance.mark(runMark); | ||
| performance.clearMarks(runMark); | ||
| } | ||
| } | ||
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| export function markTaskYield(task: {id: number}) { | ||
| if (enableProfiling) { | ||
| const yieldMark = `SchedulerTask-${task.id}-Yield-${runIdCounter}`; | ||
| performance.mark(yieldMark); | ||
| performance.clearMarks(yieldMark); | ||
| } | ||
| } | ||
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| export function markSchedulerSuspended() { | ||
| if (enableProfiling) { | ||
| mainThreadIdCounter++; | ||
| const suspendStartMark = 'SchedulerSuspended-Start-' + mainThreadIdCounter; | ||
| performance.mark(suspendStartMark); | ||
| performance.clearMarks(suspendStartMark); | ||
| } | ||
| } | ||
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| export function markSchedulerUnsuspended() { | ||
| if (enableProfiling) { | ||
| const suspendedEndMark = 'SchedulerSuspended-End-' + mainThreadIdCounter; | ||
| performance.mark(suspendedEndMark); | ||
| performance.clearMarks(suspendedEndMark); | ||
| } | ||
| } |
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