Ishai's WebLog

x64 calling convention and the disappearing process syndrome

Raymond Chen describes the parameter passing aspect of the x64 calling convetions . But there is more than parameter passing to the calling convention. Exception handling is an important part of the calling convention. A function that calls another function

Why doesn’t sampling show the actual time spent in each function?

Some people have asked for a “wall clock time” column in the sampling profiler report. Unfortunately, the actual time spent in a function cannot be reliably deduced from the collected data. Sampling counts “hits” on a function when a certain event occurs.