Hi Athira, On 10-Jan-25 3:16 PM, Athira Rajeev wrote: > In some of the powerpc platforms, event group testcase fails as below: > > # perf test -v 'Event groups' > 69: Event groups : > --- start --- > test child forked, pid 9765 > Using CPUID 0x00820200 > Using hv_24x7 for uncore pmu event > 0x0 0x0, 0x0 0x0, 0x0 0x0: Fail > 0x0 0x0, 0x0 0x0, 0x1 0x3: Pass > > The testcase creates various combinations of hw, sw and uncore > PMU events and verify group creation succeeds or fails as expected. > This tests one of the limitation in perf where it doesn't allow > creating a group of events from different hw PMUs. > > The testcase starts a leader event and opens two sibling events. > The combination the fails is three hardware events in a group. > "0x0 0x0, 0x0 0x0, 0x0 0x0: Fail" > > Type zero and config zero which translates to PERF_TYPE_HARDWARE > and PERF_COUNT_HW_CPU_CYCLE. 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
