[geofft]

Linux has a black-box reimplementation of DTrace (with different design sensibilities, but essentially all the same functionality) under the name of eBPF, and bcc for the userspace bits. Linux is trying to do that for ZFS under the name of btrfs, but it's not as good.

[Chewyrobbo]

Oracle also ported Dtrace to Oracle Linux, and was available if you purchased support from Oracle.