BenBen

SurfaceFlinger

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在Android 4.1以后，系统使用了三级缓冲机制，即此时有三个Graphic Buffer，通过 SurfaceFlinger 查看应用缓冲区信息 shell adb shell dumpsys SurfaceFlinger 输出的信息非常多，这里只关注三个信 ...

SurfaceFlinger

在Android 4.1以后，系统使用了三级缓冲机制，即此时有三个Graphic Buffer，通过 SurfaceFlinger 查看应用缓冲区信息

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adb shell dumpsys SurfaceFlinger

输出的信息非常多，这里只关注三个信息：

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......
// app 信息
* Layer 0x74dab40d70 (com.benben.viewpractice/com.benben.viewpractice.MainActivity#0)
      isSecure=false geomUsesSourceCrop=true geomBufferUsesDisplayInverseTransform=false geomLayerTransform 0x00000000 (ROT_0 ) 0x00 (IDENTITY )
    1.0000  0.0000  0.0000
    0.0000  1.0000  0.0000
    0.0000  0.0000  1.0000

      geomBufferSize=[0 0 1080 2160] geomContentCrop=[0 0 1080 2160] geomCrop=[0 0 1080 2160] geomBufferTransform=0
        Region transparentRegionHint (this=0x742ab46c20, count=1)
    [  0,   0,   0,   0]
      geomLayerBounds=[0.000000 0.000000 1080.000000 2160.000000]       shadowRadius=0.000000
      blend=NONE (1) alpha=1.000000 backgroundBlurRadius=0
      type=1 appId=10165 composition type=DEVICE (2)
      buffer: slot=0 buffer=0x73eab35450
      sideband stream=0x0
      color=[0.000000 0.000000 0.000000]
      isOpaque=true hasProtectedContent=false isColorspaceAgnostic=false dataspace=UNKNOWN (0) hdr metadata types=0 colorTransform=[[1.000,0.000,0.000,0.000][0.000,1.000,0.000,0.000][0.000,0.000,1.000,0.000][
0.000,0.000,0.000,1.000]]

......

Slots:
  // 需要            // 表明是否使用的状态 // 对象地址 // 当前负责第几帧 // 屏幕分辨率
 >[01:0x73eab519b0] state=ACQUIRED 0x73aab35bd0 frame=3094 [1080x2160:1088,  1]
  [00:0x73eab4eb90] state=FREE     0x73aab46d30 frame=3093 [1080x2160:1088,  1]

......
// 地址       // 缓冲区大小
0x73aab31f10:    0.25 KiB |    1 (  64) x    1 |    1 |        1 | 0x300 | placeholder
0x73aab35bd0: 9180.00 KiB | 1080 (1088) x 2160 |    1 |        1 | 0x1a00 | FramebufferSurface
0x73aab41180: 9720.00 KiB | 1148 (1152) x 2160 |    1 |        2 | 0x10000900 | com.android.systemui.ImageWallpaper#0
0x73aab44ed0:  280.50 KiB | 1080 (1088) x   66 |    1 |        1 | 0x10000900 | StatusBar#0
0x73aab45bc0:  280.50 KiB | 1080 (1088) x   66 |    1 |        1 | 0x10000900 | StatusBar#0
0x73aab46310: 9180.00 KiB | 1080 (1088) x 2160 |    1 |        1 | 0x10000900 | com.benben.viewpractice/com.benben.viewpractice.MainActivity#0
0x73aab46d30: 9180.00 KiB | 1080 (1088) x 2160 |    1 |        1 | 0x1a00 | FramebufferSurface
0x73aab48560:  280.50 KiB | 1080 (1088) x   66 |    1 |        1 | 0x10000900 | StatusBar#0
0x73aab49520:  561.00 KiB | 1080 (1088) x  132 |    1 |        1 | 0x10000900 | NavigationBar0#0
0x73aab497f0:  561.00 KiB | 1080 (1088) x  132 |    1 |        1 | 0x10000900 | NavigationBar0#0
0x73aab4a7b0:   20.50 KiB |   27 (  64) x   82 |    1 |        1 | 0x203 | RegionSamplingThread
0x73aab4d8a0: 9180.00 KiB | 1080 (1088) x 2160 |    1 |        1 | 0x10000900 | com.benben.viewpractice/com.benben.viewpractice.MainActivity#0
0x73aab4ddb0: 9180.00 KiB | 1080 (1088) x 2160 |    1 |        1 | 0x10000900 | com.benben.viewpractice/com.benben.viewpractice.MainActivity#0

可以看到 com.benben.viewpractice 的所有 Buffer 都没有使用，所以内存占用并没有统计进 app，如果有使用到，会在退后台，灭屏等场景进行部分回收与释放

可以看到，一个缓冲 Buffer 占用内存 9M 多，分辨率越大单个 Buffer 占用越大，如果有使用其它 Surface，如 SurfaceView 或 TextureView 则会更大