in src/process.cc [66:75]
ULONGLONG GetTotalTime(const FILETIME* kernelTime, const FILETIME* userTime) {
ULARGE_INTEGER kt, ut;
kt.LowPart = (*kernelTime).dwLowDateTime;
kt.HighPart = (*kernelTime).dwHighDateTime;
ut.LowPart = (*userTime).dwLowDateTime;
ut.HighPart = (*userTime).dwHighDateTime;
return kt.QuadPart + ut.QuadPart;
}