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authorSong Liu <songliubraving@fb.com>2021-09-10 11:33:51 -0700
committerAlexei Starovoitov <ast@kernel.org>2021-09-13 10:53:50 -0700
commit856c02dbce4f8d6a5644083db22c11750aa11481 (patch)
tree3c3230ddfc3a5e7a03b30614b3da5aa2cc6cfe86 /tools/testing/selftests/bpf/test_progs.c
parentperf: Enable branch record for software events (diff)
downloadlinux-dev-856c02dbce4f8d6a5644083db22c11750aa11481.tar.xz
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bpf: Introduce helper bpf_get_branch_snapshot
Introduce bpf_get_branch_snapshot(), which allows tracing pogram to get branch trace from hardware (e.g. Intel LBR). To use the feature, the user need to create perf_event with proper branch_record filtering on each cpu, and then calls bpf_get_branch_snapshot in the bpf function. On Intel CPUs, VLBR event (raw event 0x1b00) can be use for this. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210910183352.3151445-3-songliubraving@fb.com
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