GPU get Display ListCPUget Display ListjavaViewdraw draw Display

发现掉帧 GPU呈现模式 蓝色（get. Display. List）CPU：get. Display. List的过程，java层View的draw方法。 红色（draw. Display. List）CPU&GPU：执行draw Display. List的过程。 黄色（dequeue. Buffer&egl. Swap. Buffers）：将绘制好的Buffer交给Surface. Flinger。

发现掉帧 Buffer Queue 3缓冲：对于每个Window，Buffer Queue中有3个Buffer。 1个Buffer的状态变化：Released -> Dequeued -> Queued -> Acquired ->. . . 可在Systrace上查看Buffer的流转情况

找出问题 Systrace Method Trace (仅辅助作用) Open. GL Trace

找出问题 Systrace 抓取systrace的时候除了选择Graphics, Input, View. System, 还建议选 上Resource Loading, Dalvik VM。

找出问题 通过Systrace找出这一帧中哪段时间比较长： 1. get. Display. List 2. draw. Display. List 3. dequeue. Buffer & egl. Swap. Buffers 4. 有GC 6. 上面的都不是，在perform. Traversals之外比较长 7. 其他

找出问题 draw. Display. List 时间长：Systrace

找出问题 draw. Display. List 时间长：Open. GL Trace

链接 Android Performance Case Study: http: //www. curious-creature. com/docs/android-performance-case-study-1. html 上文的译文：http: //www. importnew. com/3784. html Hardware Acceleration: http: //developer. android. com/guide/topics/graphics/hardware-accel. html Graphics: https: //source. android. com/devices/graphics/index. html Architecture: http: //source. android. com/devices/graphics/architecture. html Systrace: http: //developer. android. com/tools/help/systrace. html http: //developer. android. com/tools/debugging/systrace. html Tracer for Open. GL ES (Open. GL Trace): http: //developer. android. com/tools/help/gltracer. html

谢谢！ 朱才 zhucai@xiaomi. com