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Android debug-hwui-profile

本文目标

探索 gpu呈现模式 测量的是什么

基本用法

原生Settings

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Settings -> 开发者选项 -> gpu呈现模式

命令行

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setprop debug.hwui.profile visual_bars # false关闭

图形解释

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蓝色: create/update DisplayList
紫色: 同步到render thread
红色: 将DisplayList转为gl命令调用
黄色: cpu等待gpu完成

profile时机

4.4.4_r1

涉及文件

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HardwareRenderer.java

绘制

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HardwareRenderer.drawProfileData() {
  mProfileData 数据
  for(i=0; i < getFrameCount()*elementCount; i+=elementCount)
    mProfileShapes[] <- bar条rect
    drawGraph() 画bar条
    drawCurrentFrame() if(当前帧) 加深当前帧的bar条
    drawThreadshold() 16ms水平线

dump

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dumpGfxInfo()
  mProfileData[i]   == Draw
  mProfileData[i+1] == Process
  mProfileData[i+2] == Execute

统计

Draw

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buildDisplayList()
  startBuildDisplayListProfiling()
  Trace.traceBegin(TRACE_TAG_VIEW, "getDisplayList")
  view.getDisplayList()
  Trace.traceEnd(TRACE_TAG_VIEW)
  endBuildDisplayListProfiling()

Process

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drawDisplayList()
  Trace.traceBegin(Trace.TRACE_TAG_VIEW, "drawDisplayList")
  canvas.drawDisplayList()
  Trace.traceEnd(Trace.TRACE_TAG_VIEW)
<- draw()

Execute

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swapBuffers()
  sEgl.eglSwapBuffers(sEglDisplay, mEglSurface)
<- draw()

6.0.0_r1

涉及文件

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frameworks/base/libs/hwui/renderthread/CanvasContext.cpp
frameworks/base/libs/hwui/renderthread/FrameInfoVisualizer.cpp

绘制

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FrameInfoVisualizer::draw()
  mFrameSource[] 数据
  initializeRects() 根据数据设置所有 bar rect(left/right, top=bottom=baseline)
  drawGraph() { foreach bar: nextBarSegment() 计算bar高度; canvas->drawRects() }
  drawThreshold() 16ms水平线

dump

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FrameInfoVisulizer::dumpData()
  [IntentdedVsync, SyncStart]           == Draw
  [SyncStart, IssueDrawCommandsStart]   == Prepare
  [IssueDrawCommandsStart, SwapBuffers] == Process
  [SwapBuffers, FrameCompleted]         == Execute

流程

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ui线程 ThreadedRenderer.java draw() -> nSyncAndDrawFrame()
--jni--> nSyncAndDrawFrame()
-> RenderProxy::syncAndDrawFrame()
-> DrawFrameTask::drawFrame() { postAndWait() 等待render线程完成当前帧 }

DrawFrameTask 继承自 RenderTask

render线程
初始化在 RenderProxy::ctor() 中 RenderThread::getInstance(), 是个Looper Thread
调用 threadLoop()
-> DrawFrameTask::run() {
  if(canUnblockUiThread) unblockUiThread() 发信号给ui线程
  if(canDrawFrame) (CanvasContext context)->draw()
  if(!canUnblockUiThread) unblockUiThread()
}

统计

Draw

IntentdedVsync
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FrameInfo.h
UiFrameInfoBuilder::setVsync(vsyncTime, intendedVsync)
1. <- CanvasContext::doFrame() {
  setVsync() 标识vsync时间
  prepareTree()
  CanvasContext::draw() }
<- RenderThread::dispatchFrameCallbacks()
<--queue-- RenderThread::drainDisplayEventQueue()
<- RenderThread::threadLoop()

2. <- frameworks/base/core/jni android_view_Surface.cpp ContextFactory::draw()
SyncStart
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CanvasContext::prepareTree()
  mCurrentFrameInfo->markSyncStart()
<- doFrame()
IssueDrawCommandsStart
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CanvasContext::draw()
  mCurrentFrameInfo->markIssueDrawCommandsStart()
SwapBuffers
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1. CanvasContext::draw()

2. FrameInfoVisualizer::draw() 临时mark当前帧
FrameCompleted
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1. CanvasContext::draw()

2. FrameInfoVisualizer::draw() 临时mark当前帧