问题
I'm unable to run the Android SDK tool called systrace.pl because I get errors like:
error opening /sys/kernel/debug/tracing/options/overwrite: No such file or directory
And indeed the /sys/kernel/debug/tracing directory doesn't even exist.
A little research showed I need to enable debugfs with the following command:
mount -o rw,remount -t debugfs none /sys/kernel/debug
Running mount there afterwards indicates the debugfs is running:
#mount
...
/sys/kernel/debug /sys/kernel/debug debugfs rw,relatime 0 0
...
And I have trace enabled (all items) in the developer settings menu. I'm using the stock ROM 4.1.1 on a Samsung Galaxy S3.
There's a lot of articles out there on systrace for Android but nothing seems to solve the problem of no files actually being generated in /sys/kernel/debug/tracing...
回答1:
Take a look at this document:
Tracing on Android 4.3 and higher
To run a trace on Android 4.3 and higher devices:
Make sure the device is connected through a USB cable and is enabled for debugging.
I think that systrace must be run on a device, not an emulator. I'm getting the same error in my emulator.
回答2:
Answered the same question below:
Make Systrace work with 4.1.2 device on Mac
Looks like your systrace is not enabled on the kernel your device is running, you need to replace your boot.img with one that has systrace support.
回答3:
You don't have access to that categories that you have selected.
use following command to check what all categories that current device can support.
$python systrace.py -l
gfx - Graphics
input - Input
view - View System
webview - WebView
wm - Window Manager
am - Activity Manager
sm - Sync Manager
audio - Audio
video - Video
camera - Camera
hal - Hardware Modules
app - Application
res - Resource Loading
dalvik - Dalvik VM
rs - RenderScript
bionic - Bionic C Library
power - Power Management
root and remount the device before running above command.
adb root
adb remount
来源：https://stackoverflow.com/questions/17207841/running-android-systrace-on-device