Originally the code used short or long prologs depending on necessity. This worked, but one of either mdb(1) or DTrace couldn't produce stack traces with short prologs (can't remember which), so code was changed to use long function prologs. I think we also lost leaf functions in this process, which is bad.
Originally the code used short or long prologs depending on necessity. This worked, but one of either mdb(1) or DTrace couldn't produce stack traces with short prologs (can't remember which), so code was changed to use long function prologs. I think we also lost leaf functions in this process, which is bad.