Hi, Yes, it's GPL (and we got rid of the separate kernel module). The utils portion is UPL.

It's available with new kernels (including 5.0) on github as well.

https://github.com/oracle/dtrace-utils

https://github.com/oracle/libdtrace-ctf

https://github.com/ezannoni/dtrace-linux-kernel

We are working on a Fedora version of the kernel patches.

We are also discussing with the BPF team (on netdev) how to provide DTrace functionality integrated with the Linux Kernel.