Hi Stephane,
Is PEBS supported in pfmon 3.9 on Intel Nehalem processor?
I am running Redhat Enterprise 5 with kernel 2.6.29, and my processor is Intel Nehalem (Xeon 5520). 
When I want to sample with pebs, I find the PEBS is not supported. The following is the output while I
running command "pfmon -I".
[ljj@discovery cpu2006]$ pfmon -I
detected host CPUs:  8-way 1600MHz/8.0MB -- Intel(R) Xeon(R) CPU E5520 @ 2.27GHz (stepping 5)
detected pfmon  PMU model: Intel Nehalem
detected libpfm PMU model: Intel Nehalem
max counters/set: 16
supported pfmon PMU models: [AMD64] [Pentium 4] [Intel Core] [Intel Atom] [Intel Nehalem] [Intel architectural PMU]
supported sampling modules: [inst-hist] [detailed] [compact] [raw]
pfmlib version: 3.9
kernel perfmon version: 2.82
kernel clock resolution: 999848ns (1000Hz)
host kernel architecture: x86_64
Did I make some mistakes while installing the pfmon?