Android CPU usage: What do the red, green and purple bars and the numbers mean?
From Android - Handset built in Developer Tools - “Show Cpu Usage” option meaning?

Leszek's answer


  Numbers in the first row shows average CPU usage in time intervals 1 minute/5 minutes/15 minutes. Color bars shows how much time CPU spends in userspace(green), kernel(red), i/o(blue).


Also see the accepted answer for a developer explanation