抓取systrace

(1) P 及 P之前  用systrace.py或者atrace

atrace -b 20000 sched freq idle gfx view am wm -t 10 -o /data/a.trace

frameworks/native/services/surfaceflinger/surfaceflinger.rc

service surfaceflinger /system/bin/surfaceflinger
    class core animation
    user system
    group graphics drmrpc readproc

---->

service surfaceflinger /system/bin/surfaceflinger
    class core animation
    user root
    group graphics drmrpc readproc root system

(2) P之后（推荐perfetto）

setprop persist.traced.enable 1

ps -ef | grep -E "traced|traced_probes"

perfetto -o /data/misc/perfetto-traces/per.trace -t 60s sched freq idle gfx view am wm

load trace分析：

Perfetto UIhttps://ui.perfetto.dev/#!/