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The structure perf_event_attr sometimes gets new members appended at the end of the structure. Then the size of the structure increases. This may lead to the situation where sizeof(struct perf_event_attr) calculated at the pai program compile time during s390-tools build differs from the one used to build application programs on the target system. The report files written by various tools write the contents of the perf_event_attr structure followed by indivual samples to a binary file. The second member perf_event_attr::size contains the size of that structure in bytes. Use that perf_event_attr::size from the target system to scan the report files given as command line argument. This ensure the correct size of structure perf_event_attr is used. Output before: Current situation: The pai program uses a perf_event_attr structure which contains 8 bytes less than the one used on the target system. The first sample header (8 bytes) then actually refers to the last eight bytes of structure perf_event_attr, which are all zeroes. This is an invalid sample entry and the program terminates with error. # pai -r -V painnpa.0004043; echo $? painnpa.0004043 size:1344 [0x000088] type 0 misc 0 size 0 1 Output after: Use the correct size of structure perf_event_attr, which was read from be binary file, written by the tools compiled on the target system: # pai -r -V painnpa.0004043; echo $? painnpa.0004043 size:1344 size perf_event_attr mismatch 136/144 [0x000090] type 9 misc 1 size 58 0x13537f71715 18 event 6144 \ sample pid 4043/4043 15:0x8a,16:0x88,22:0x112,25:0xc0 ... 0 Also show an debug message when verbose mode is turned on. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Jan Polensky <japo@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>