Android thread stime,utime?

What does this mean and what's the difference?

开发者_如何学运维stime and utime in DDMS

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utime - cumulative time spent executing user code, in "jiffies" (usually 10ms). Only available under Linux. stime - cumulative time spent executing system code, in "jiffies" (usually 10ms).

Please more detail check link http://www.linuxtopia.org/online_books/android/devguide/guide/developing/tools/ddms.html