Process calls Environment for Cpu usage for current process.

Author: tarekgh

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.FreeBSD.cs

@@ -34,6 +34,11 @@ public TimeSpan TotalProcessorTime
         {
             get
             {
+                if (IsCurrentProcess)
+                {
+                    return Environment.CpuUsage.TotalTime;
+                }
+
                 EnsureState(State.HaveNonExitedId);
                 Interop.Process.proc_stats stat = Interop.Process.GetThreadInfo(_processId, 0);
                 return Process.TicksToTimeSpan(stat.userTime + stat.systemTime);
@@ -51,6 +56,10 @@ public TimeSpan UserProcessorTime
         {
             get
             {
+                if (IsCurrentProcess)
+                {
+                    return Environment.CpuUsage.UserTime;
+                }
                 EnsureState(State.HaveNonExitedId);
 
                 Interop.Process.proc_stats stat = Interop.Process.GetThreadInfo(_processId, 0);
@@ -66,6 +75,11 @@ public TimeSpan PrivilegedProcessorTime
         {
             get
             {
+                if (IsCurrentProcess)
+                {
+                    return Environment.CpuUsage.PrivilegedTime;
+                }
+
                 EnsureState(State.HaveNonExitedId);
 
                 Interop.Process.proc_stats stat = Interop.Process.GetThreadInfo(_processId, 0);

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Linux.cs

@@ -53,10 +53,7 @@ public static Process[] GetProcessesByName(string? processName, string machineNa
         [SupportedOSPlatform("maccatalyst")]
         public TimeSpan PrivilegedProcessorTime
         {
-            get
-            {
-                return TicksToTimeSpan(GetStat().stime);
-            }
+            get => IsCurrentProcess ? Environment.CpuUsage.PrivilegedTime : TicksToTimeSpan(GetStat().stime);
         }
 
         /// <summary>Gets the time the associated process was started.</summary>
@@ -132,6 +129,11 @@ public TimeSpan TotalProcessorTime
         {
             get
             {
+                if (IsCurrentProcess)
+                {
+                    Environment.CpuUsage.TotalTime;
+                }
+
                 Interop.procfs.ParsedStat stat = GetStat();
                 return TicksToTimeSpan(stat.utime + stat.stime);
             }
@@ -146,10 +148,7 @@ public TimeSpan TotalProcessorTime
         [SupportedOSPlatform("maccatalyst")]
         public TimeSpan UserProcessorTime
         {
-            get
-            {
-                return TicksToTimeSpan(GetStat().utime);
-            }
+            get => IsCurrentProcess ? Environment.CpuUsage.UserTime : TicksToTimeSpan(GetStat().utime);
         }
 
         partial void EnsureHandleCountPopulated()

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.OSX.cs

@@ -22,6 +22,11 @@ public TimeSpan PrivilegedProcessorTime
         {
             get
             {
+                if (IsCurrentProcess)
+                {
+                    return Environment.CpuUsage.PrivilegedTime;
+                }
+
                 EnsureState(State.HaveNonExitedId);
                 Interop.libproc.rusage_info_v3 info = Interop.libproc.proc_pid_rusage(_processId);
                 return MapTime(info.ri_system_time);
@@ -64,6 +69,11 @@ public TimeSpan TotalProcessorTime
         {
             get
             {
+                if (IsCurrentProcess)
+                {
+                    return Environment.CpuUsage.TotalTime;
+                }
+
                 EnsureState(State.HaveNonExitedId);
                 Interop.libproc.rusage_info_v3 info = Interop.libproc.proc_pid_rusage(_processId);
                 return MapTime(info.ri_system_time + info.ri_user_time);
@@ -81,6 +91,11 @@ public TimeSpan UserProcessorTime
         {
             get
             {
+                if (IsCurrentProcess)
+                {
+                    return Environment.CpuUsage.UserTime;
+                }
+
                 EnsureState(State.HaveNonExitedId);
                 Interop.libproc.rusage_info_v3 info = Interop.libproc.proc_pid_rusage(_processId);
                 return MapTime(info.ri_user_time);

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Windows.cs

@@ -232,7 +232,7 @@ private DateTime ExitTimeCore
         [SupportedOSPlatform("maccatalyst")]
         public TimeSpan PrivilegedProcessorTime
         {
-            get { return GetProcessTimes().PrivilegedProcessorTime; }
+            get => IsCurrentProcess ? Environment.CpuUsage.PrivilegedTime : GetProcessTimes().TotalProcessorTime;
         }
 
         /// <summary>Gets the time the associated process was started.</summary>
@@ -251,7 +251,7 @@ internal DateTime StartTimeCore
         [SupportedOSPlatform("maccatalyst")]
         public TimeSpan TotalProcessorTime
         {
-            get { return GetProcessTimes().TotalProcessorTime; }
+            get => IsCurrentProcess ? Environment.CpuUsage.TotalTime : GetProcessTimes().TotalProcessorTime;
         }
 
         /// <summary>
@@ -263,7 +263,7 @@ public TimeSpan TotalProcessorTime
         [SupportedOSPlatform("maccatalyst")]
         public TimeSpan UserProcessorTime
         {
-            get { return GetProcessTimes().UserProcessorTime; }
+            get => IsCurrentProcess ? Environment.CpuUsage.UserTime : GetProcessTimes().UserProcessorTime;
         }
 
         /// <summary>

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.cs

@@ -1106,6 +1106,8 @@ public static Process[] GetProcesses(string machineName)
             return processes;
         }
 
+        private bool IsCurrentProcess => _processId == Environment.ProcessId;
+
         /// <devdoc>
         ///    <para>
         ///       Returns a new <see cref='System.Diagnostics.Process'/>