optimized dex types in dalvik cache

Question

In /data/dalvik-cache we found two formats (system and data),

data@app@com.foo.apk@classes.dex

and

system@app@com.foo.apk@classes.dex

What do they mean? I mean what is meant by data and system here?

Answer 1

That refers to the path of the apk on the device. In your two examples, the paths would be /data/app/com.foo.apk and /system/app/com.foo.apk. In other words, the system@app odex files are for system applications installed on the system partition, and the data@app odex files are for applications that have been installed and live on the data partition.