It might not be hard for systemtap to parse dtrace's smaller scripting
language, but there's more to it than that. A variety of dtrace
kernel and userspace features have no equivalent yet, so many real
dtrace scripts would not work. Plus, may dtrace scripts use
type names/structs/fields that do not correspond to those in
linux, so one would need to change those scripts or create a
solaris emulation layer someplace.