Hi,
I was able to build oprofile on RHEL4 x86_64 using the CVS version of the source.

However when I tried to get the callgraph, I got this message -

[root@gdnh1001.adx.ac4 ~]# opcontrol --callgraph=100
Call-graph profiling unsupported on this kernel/hardware


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Regards,
Kashyap