Failed to use systrace in Jelly Bean

Question

I\'ve tried to use new systrace from jelly bean release, but with no luck.

I enabled graphics and views traces in development settings like on I/O session, and tried

Answer 1

try the following commands:

adb root (not sure if this is necessary), adb shell mount -t debugfs nodev /sys/kernel/debug

Under these commands the script should run correctly, although for me the html file only contains rows for each CPU, and not the individual components such as surface flinger, which was visible in the google IO talks video.