/// <summary>
/// Sets the Profile Sources (CPU machine counters) that will be used if PMC (Precise Machine Counters)
/// are turned on. Each CPU counter is given a id (the profileSourceID) and has an interval
/// (the number of counts you skip for each event you log). You can get the human name for
/// all the supported CPU counters by calling GetProfileSourceInfo. Then choose the ones you want
/// and configure them here (the first array indicating the CPU counters to enable, and the second
/// array indicating the interval. The second array can be shorter then the first, in which case
/// the existing interval is used (it persists and has a default on boot).
/// </summary>
public static unsafe void SetProfileSources(int[] profileSourceIDs, int[] profileSourceIntervals)
{
var version = Environment.OSVersion.Version.Major * 10 + Environment.OSVersion.Version.Minor;
if (version < 62)
throw new ApplicationException("Profile source only availabe on Win8 and beyond.");
TraceEventNativeMethods.SetSystemProfilePrivilege();
var interval = new TraceEventNativeMethods.TRACE_PROFILE_INTERVAL();
for (int i = 0; i < profileSourceIntervals.Length; i++)
{
interval.Source = profileSourceIDs[i];
interval.Interval = profileSourceIntervals[i];
var result = TraceEventNativeMethods.TraceSetInformation(0,
TraceEventNativeMethods.TRACE_INFO_CLASS.TraceSampledProfileIntervalInfo,
&interval, sizeof(TraceEventNativeMethods.TRACE_PROFILE_INTERVAL));
if (result != 0)
Marshal.ThrowExceptionForHR(TraceEventNativeMethods.GetHRFromWin32(result));
}
fixed (int* sourcesPtr = profileSourceIDs)
{
var result = TraceEventNativeMethods.TraceSetInformation(0,
TraceEventNativeMethods.TRACE_INFO_CLASS.TraceProfileSourceConfigInfo,
sourcesPtr, profileSourceIDs.Length * sizeof(int));
if (result != 0)
Marshal.ThrowExceptionForHR(TraceEventNativeMethods.GetHRFromWin32(result));
}
}
/// <summary>
/// Returns a ditionary of keyed by name of ProfileSourceInfo structures for all the CPU counters available on the machine.
/// TODO FIX NOW remove log parameter.
/// </summary>
public static unsafe Dictionary<string, ProfileSourceInfo> GetProfileSourceInfo()
{
var version = Environment.OSVersion.Version.Major * 10 + Environment.OSVersion.Version.Minor;
if (version < 62)
throw new ApplicationException("Profile source only availabe on Win8 and beyond.");
var ret = new Dictionary<string, ProfileSourceInfo>(StringComparer.OrdinalIgnoreCase);
// Figure out how much space we need.
int retLen = 0;
var result = TraceEventNativeMethods.TraceQueryInformation(0,
TraceEventNativeMethods.TRACE_INFO_CLASS.TraceProfileSourceListInfo,
null, 0, ref retLen);
Debug.Assert(result == 24); // Not enough space.
if (retLen != 0)
{
// Do it for real.
byte* buffer = stackalloc byte[retLen];
result = TraceEventNativeMethods.TraceQueryInformation(0,
TraceEventNativeMethods.TRACE_INFO_CLASS.TraceProfileSourceListInfo,
buffer, retLen, ref retLen);
if (result == 0)
{
var interval = new TraceEventNativeMethods.TRACE_PROFILE_INTERVAL();
var profileSource = (TraceEventNativeMethods.PROFILE_SOURCE_INFO*)buffer;
for (int i = 0; i < 10; i++)
{
char* namePtr = (char*)&profileSource[1]; // points off the end of the array;
interval.Source = profileSource->Source;
interval.Interval = 0;
result = TraceEventNativeMethods.TraceQueryInformation(0,
TraceEventNativeMethods.TRACE_INFO_CLASS.TraceSampledProfileIntervalInfo,
&interval, sizeof(TraceEventNativeMethods.TRACE_PROFILE_INTERVAL), ref retLen);
if (result != 0)
Marshal.ThrowExceptionForHR(TraceEventNativeMethods.GetHRFromWin32(result));
var name = new string(namePtr);
ret.Add(name, new ProfileSourceInfo()
{
Name = name,
ID = profileSource->Source,
Interval = interval.Interval,
MinInterval = profileSource->MinInterval,
MaxInterval = profileSource->MaxInterval,
});
if (profileSource->NextEntryOffset == 0)
break;
profileSource = (TraceEventNativeMethods.PROFILE_SOURCE_INFO*)(profileSource->NextEntryOffset + (byte*)profileSource);
}
}
else
Marshal.ThrowExceptionForHR(TraceEventNativeMethods.GetHRFromWin32(result));
}
return ret;
}
