If PERF_SAMPLE_BRANCH_STACK is enabled then samples are returned with the format { u64 from, to, flags } but the flags layout is not specified. This field has the type struct perf_branch_entry; move this definition into include/uapi/linux/perf_event.h so users can access these fields. This is similar to the existing inclusion of perf_mem_data_src in the include/uapi/linux/perf_event.h file.
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| @@ -757,4 +757,28 @@ union perf_mem_data_src { · 756 unmodified lines | ||
| 757 | 757 | #define PERF_MEM_S(a, s) \ |
| 758 | 758 | (((u64)PERF_MEM_##a##_##s) << PERF_MEM_##a##_SHIFT) |
| 759 | 759 | |
| 760 | +/* | |
| 761 | + * single taken branch record layout: | |
| 762 | + * | |
| 763 | + * from: source instruction (may not always be a branch insn) | |
| 764 | + * to: branch target | |
| 765 | + * mispred: branch target was mispredicted | |
| 766 | + * predicted: branch target was predicted | |
| 767 | + * | |
| 768 | + * support for mispred, predicted is optional. In case it | |
| 769 | + * is not supported mispred = predicted = 0. | |
| 770 | + * | |
| 771 | + * in_tx: running in a hardware transaction | |
| 772 | + * abort: aborting a hardware transaction | |
| 773 | + */ | |
| 774 | +struct perf_branch_entry { | |
| 775 | + __u64 from; | |
| 776 | + __u64 to; | |
| 777 | + __u64 mispred:1, /* target mispredicted */ | |
| 778 | + predicted:1,/* target predicted */ | |
| 779 | + in_tx:1, /* in transaction */ | |
| 780 | + abort:1, /* transaction abort */ | |
| 781 | + reserved:60; | |
| 782 | +}; | |
| 783 | + | |
| 760 | 784 | #endif /* _UAPI_LINUX_PERF_EVENT_H */ |