On 4/3/24 5:26 PM, Andrii Nakryiko wrote:
Inline bpf_get_branch_snapshot() helper using architecture-agnostic inline BPF code which calls directly into underlying callback of perf_snapshot_branch_stack static call. This callback is set early during kernel initialization and is never updated or reset, so it's ok to fetch actual implementation using static_call_query() and call directly into it. This change eliminates a full function call and saves one LBR entry in PERF_SAMPLE_BRANCH_ANY LBR mode. Acked-by: John Fastabend <john.fastabend@xxxxxxxxx> Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Acked-by: Yonghong Song <yonghong.song@xxxxxxxxx>
