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Commit cdadee63 authored by Dianne Hackborn's avatar Dianne Hackborn
Browse files

Fix some divide by zero errors that could crash the system. 

Change-Id: I66273df84e45de59b5b161f4d13de67a9e0f46d5
parent 1ad66b2f

core/java/com/android/internal/os/ProcessStats.java

+6 −3
Original line number Diff line number Diff line
@@ -619,8 +619,11 @@ public class ProcessStats { 
    }

    

    final public float getTotalCpuPercent() {

        return ((float)(mRelUserTime+mRelSystemTime+mRelIrqTime)*100)

                / (mRelUserTime+mRelSystemTime+mRelIrqTime+mRelIdleTime);

        int denom = mRelUserTime+mRelSystemTime+mRelIrqTime+mRelIdleTime;

        if (denom <= 0) {

            return 0;

        }

        return ((float)(mRelUserTime+mRelSystemTime+mRelIrqTime)*100) / denom;

    }

    

    final void buildWorkingProcs() {
@@ -699,7 +702,7 @@ public class ProcessStats { 


        long sampleTime = mCurrentSampleTime - mLastSampleTime;

        long sampleRealTime = mCurrentSampleRealTime - mLastSampleRealTime;

        long percAwake = (sampleTime*100) / sampleRealTime;

        long percAwake = sampleRealTime > 0 ? ((sampleTime*100) / sampleRealTime) : 0;

        if (percAwake != 100) {

            pw.print(" with ");

            pw.print(percAwake);