[process] Fix #599 cap percent values returned by *Percent() between 0 and 100

process/process.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"math"
 	"runtime"
 	"time"
 
@@ -212,7 +213,7 @@ func calculatePercent(t1, t2 *cpu.TimesStat, delta float64, numcpu int) float64
 	}
 	delta_proc := t2.Total() - t1.Total()
 	overall_percent := ((delta_proc / delta) * 100) * float64(numcpu)
-	return overall_percent
+	return math.Min(100, math.Max(0, overall_percent))
 }
 
 // MemoryPercent returns how many percent of the total RAM this process uses
@@ -233,7 +234,7 @@ func (p *Process) MemoryPercentWithContext(ctx context.Context) (float32, error)
 	}
 	used := processMemory.RSS
 
-	return (100 * float32(used) / float32(total)), nil
+	return float32(math.Min(100, math.Max(0, (100*float64(used)/float64(total))))), nil
 }
 
 // CPU_Percent returns how many percent of the CPU time this process uses
@@ -258,5 +259,5 @@ func (p *Process) CPUPercentWithContext(ctx context.Context) (float64, error) {
 		return 0, nil
 	}
 
-	return 100 * cput.Total() / totalTime, nil
+	return math.Min(100, math.Max(0, 100*cput.Total()/totalTime)), nil
 }