DTrace was deliberately licensed in a way to be incompatible with the Linux kernel.
This was commented on directly by Bryan Cantrill on HN [1]. You should also watch his "Fork Yeah!" [2] and "Corporate Open Source Anti-Patterns" [3] talks for full context.
This was commented on directly by Bryan Cantrill on HN [1]. You should also watch his "Fork Yeah!" [2] and "Corporate Open Source Anti-Patterns" [3] talks for full context.
[1]: https://news.ycombinator.com/item?id=4357507
[2]: http://www.youtube.com/watch?v=-zRN7XLCRhc
[3]: http://www.youtube.com/watch?v=NhgXQFk9noI