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There is event constraint in powerpc > that events using same counter cannot be programmed in a group. > Here there is one alternative event for cycles, hence one leader > and only one sibling event can go in as a group. For power9, cycles seems to map to PM_CYC event: GENERIC_EVENT_ATTR(cpu-cycles, PM_CYC); However, I don't see PM_CYC in power9_event_alternatives[]. Is PM_RUN_CYC and PM_CYC are same? Thanks, Ravi