providers: add support for USDT tracing using libbpf/usdt #1663
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Default to providing lightweight USDT trace points when LTTng is unavailable. This piggybacks on the existing tracing code added for LTTng for a minimal set of changes. > $ sudo bpftrace -l usdt:build/lib/lib*.so:* > usdt:build/lib/libefa-rdmav59.so:rdma_core_efa:post_recv > usdt:build/lib/libefa-rdmav59.so:rdma_core_efa:post_send > usdt:build/lib/libefa-rdmav59.so:rdma_core_efa:process_completion > usdt:build/lib/libefa.so:rdma_core_efa:post_recv > usdt:build/lib/libefa.so:rdma_core_efa:post_send > usdt:build/lib/libefa.so:rdma_core_efa:process_completion > usdt:build/lib/libhns-rdmav59.so:rdma_core_hns:poll_cq > usdt:build/lib/libhns-rdmav59.so:rdma_core_hns:post_recv > usdt:build/lib/libhns-rdmav59.so:rdma_core_hns:post_send > usdt:build/lib/libhns.so:rdma_core_hns:poll_cq > usdt:build/lib/libhns.so:rdma_core_hns:post_recv > usdt:build/lib/libhns.so:rdma_core_hns:post_send > usdt:build/lib/libmlx5-rdmav59.so:rdma_core_mlx5:post_send > usdt:build/lib/libmlx5.so:rdma_core_mlx5:post_send > usdt:build/lib/librxe-rdmav59.so:rdma_core_rxe:post_send The USDT header used here is from the libbpf/usdt project at https://github.com/libbpf/usdt.git Further background discussion for this commit is included in linux-rdma#1621 Signed-off-by: Nathan Scott <nathans@redhat.com>
mrgolin reviewed Nov 13, 2025
| #define rdma_tracepoint(arg...) | ||
| #include <util/usdt.h> | ||
| | ||
| #define rdma_tracepoint(arg...) USDT(arg) |
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This should also be enabled by a cmake flag and not as fallback to LTTng.
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Default to providing lightweight USDT trace points when LTTng is unavailable. This piggybacks on the existing tracing code added for LTTng for a minimal set of changes.
The USDT header used here is from the libbpf/usdt project at https://github.com/libbpf/usdt.git
Further background discussion for this commit is included in #1621