Reasons are :
* broken for years
* no one from active committers seems to have used it for years
* requires rebuilding natives locally to be used which too few people
can do on their own
* systemtap/dtrace like tools provide far superior and easier to use
profiling features
* documentation/examples for the usage is not existent (at least I am
not aware of such)
* complicates the native headers and generation tool