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Platform specific PMU supports alternative event for some of the event codes. During perf_event_open, it any event group doesn't match constraint check criteria, further lookup is done to find alternative event. Code checks to see if it is possible to schedule event as group using alternative events. Testcase exercises the alternative event find code for power9. Example, since events in same PMC can't go in as a group, ideally using PM_RUN_CYC_ALT (0x200f4) and PM_BR_TAKEN_CMPL (0x200fa) will fail. But since RUN_CYC (0x600f4) is alternative event for 0x200f4, it is possible to use 0x600f4 and 0x200fa as group. Testcase uses such combination for all events in power9 which has an alternative event. Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220610134113.62991-27-atrajeev@linux.vnet.ibm.com |
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| alignment | ||
| benchmarks | ||
| cache_shape | ||
| copyloops | ||
| dscr | ||
| eeh | ||
| include | ||
| lib | ||
| math | ||
| mce | ||
| mm | ||
| nx-gzip | ||
| papr_attributes | ||
| pmu | ||
| primitives | ||
| ptrace | ||
| scripts | ||
| security | ||
| signal | ||
| stringloops | ||
| switch_endian | ||
| syscalls | ||
| tm | ||
| vphn | ||
| harness.c | ||
| Makefile | ||
| utils.c | ||