[android-developers] Android memory usage API (USS/PSS) Vs smem report

Reading how to mesure accurately a process memory usage (http://elinux.org/Android_Memory_Usage), I've been using USS provided by PrivateDirty: http://developer.android.com/reference/android/os/Debug.MemoryInfo.html

Per D. Hackborn comment (http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android/2299813#2299813), USS reported by the Android API is PrivateDirty.

However when using smem (http://www.selenic.com/smem/), I noticed that USS reported by smem is actually PrivateDirty + PrivateClean, so I was wondering why this difference and what's more accurate ? 

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