冷启动优化

打印所有信息：python systrace.py -b 32768 -t 15 -o mytrace.html gfx input view webview wm am sm audio video camera hal app res dalvik rs bionic power sched irq freq idle disk mmc load sync workq memreclaim regulators -a com.xxx.xxx
ref:http://gityuan.com/2016/01/17/systrace/