2.6.14-rt1: oprofile doesn't work anymore

[Lee Revell <rlrevell@joe-job.com>]

Several months ago oprofile just stopped working on my system.  All I
have changed on the system was updating the kernel.  This used to work
perfectly.  I figured it was something I overlooked but recently I
double checked everything and I can't for the life of me figure out
what's wrong.

I am using the simple "profile" script that Andrew Morton posted several
months ago.  But no matter what I do, all I get is:

opreport error: No sample file found: try running opcontrol --dump
or specify a session containing sample files

(Of course I have tried running opcontrol --dump, it has absolutely no
effect)

Examining the log files I see that it does not collect any samples.

root@mindpipe:~# cat /var/lib/oprofile/oprofiled.log 
oprofiled started Thu Nov  3 16:32:05 2005
kernel pointer size: 4

Thu Nov  3 16:32:31 2005

Nr. sample dumps: 4
Nr. non-backtrace samples: 0
Nr. kernel samples: 0
Nr. lost samples (no kernel/user): 0
Nr. lost kernel samples: 0
Nr. incomplete code structs: 0
Nr. samples lost due to sample file open failure: 0
Nr. samples lost due to no permanent mapping: 0
Nr. event lost due to buffer overflow: 0
Nr. samples lost due to no mapping: 0
Nr. backtraces skipped due to no file mapping: 0
Nr. samples lost due to no mm: 0
Nr. samples lost cpu buffer overflow: 0
Nr. samples received: 0
Nr. backtrace aborted: 0
oprofiled stopped Thu Nov  3 16:32:31 2005

Is there something in the -rt tree that's known to break oprofile?  Or
did the userspace interface change in an incompatible way?

Lee