// Calculates the number of private pages in memory based on working set information.
private static int CalculatePrivatePages(PSAPI_WORKING_SET_INFORMATION workingSet)
{
int totalPages = workingSet.NumberOfEntries;
int privatePages = 0;
for (int i = 0; i < totalPages; i++)
{
if (workingSet.WorkingSetInfo[i].Block1.Shared == 0)
{
privatePages++;
}
}
return(privatePages);
}
// Generates an array containing working set information based on a pointer in memory.
private static PSAPI_WORKING_SET_INFORMATION GenerateWorkingSetArray(IntPtr workingSetPointer)
{
int entries = Marshal.ReadInt32(workingSetPointer);
PSAPI_WORKING_SET_INFORMATION workingSet = new PSAPI_WORKING_SET_INFORMATION();
workingSet.NumberOfEntries = entries;
workingSet.WorkingSetInfo = new PSAPI_WORKING_SET_BLOCK[entries];
for (int i = 0; i < entries; i++)
{
workingSet.WorkingSetInfo[i].Flags = (uint)Marshal.ReadInt32(workingSetPointer, 4 + i * 4);
}
return(workingSet);
}
internal static long GetPrivateWorkingSet(Process process)
{
SYSTEM_INFO sysinfo = new SYSTEM_INFO();
NativeMethods.GetSystemInfo(ref sysinfo);
int wsInfoLength = (int)(Marshal.SizeOf(new PSAPI_WORKING_SET_INFORMATION()) +
Marshal.SizeOf(new PSAPI_WORKING_SET_BLOCK()) * (process.WorkingSet64 / (sysinfo.dwPageSize)));
IntPtr workingSetPointer = Marshal.AllocHGlobal(wsInfoLength);
if (NativeMethods.QueryWorkingSet(process.Handle, workingSetPointer, wsInfoLength) == 0)
{
throw new Win32Exception();
}
PSAPI_WORKING_SET_INFORMATION workingSet = GenerateWorkingSetArray(workingSetPointer);
Marshal.FreeHGlobal(workingSetPointer);
return(CalculatePrivatePages(workingSet) * sysinfo.dwPageSize);
}