hi, adding tracing_multi link support that allows fast attachment of tracing program to many functions.
RFC version: https://lore.kernel.org/bpf/[email protected]/ Changes to RFC: - added ftrace_hash_count as wrapper for hash_count [Steven] - added trampoline mutex pool [Andrii] - reworked 'struct bpf_tramp_node' separatoin [Andrii] - the 'struct bpf_tramp_node' now holds pointer to bpf_link, which is similar to what we do for uprobe_multi; I understand it's not a fundamental change compared to previous version which used bpf_prog pointer instead, but I don't see better way of doing this.. I'm happy to discuss this further if there's better idea - reworked 'struct bpf_fsession_link' based on bpf_tramp_node - made btf__find_by_glob_kind function internal helper [Andrii] - many small assorted fixes [Andrii,CI] - added session support [Leon Hwang] - added cookies support - added more tests Note I plan to send linkinfo/fdinfo support separately. TODO: add rollback tests, add f*.multi.s tests, add trigger bench --- Jiri Olsa (17): ftrace: Add ftrace_hash_count function bpf: Use mutex lock pool for bpf trampolines bpf: Add struct bpf_trampoline_ops object bpf: Add struct bpf_tramp_node object bpf: Factor fsession link to use struct bpf_tramp_node bpf: Add multi tracing attach types bpf: Add bpf_trampoline_multi_attach/detach functions bpf: Add support for tracing multi link bpf: Add support for tracing_multi link cookies bpf: Add support for tracing_multi link session libbpf: Add support to create tracing multi link selftests/bpf: Add tracing multi skel/pattern/ids attach tests selftests/bpf: Add tracing multi intersect tests selftests/bpf: Add tracing multi cookies test selftests/bpf: Add tracing multi session test selftests/bpf: Add tracing multi attach fails test selftests/bpf: Add tracing multi attach benchmark test arch/arm64/net/bpf_jit_comp.c | 58 ++++----- arch/s390/net/bpf_jit_comp.c | 42 +++--- arch/x86/net/bpf_jit_comp.c | 54 ++++---- include/linux/bpf.h | 87 +++++++++---- include/linux/bpf_types.h | 1 + include/linux/ftrace.h | 1 + include/linux/trace_events.h | 6 + include/uapi/linux/bpf.h | 9 ++ kernel/bpf/bpf_struct_ops.c | 27 ++-- kernel/bpf/btf.c | 4 + kernel/bpf/syscall.c | 91 ++++++++----- kernel/bpf/trampoline.c | 457 ++++++++++++++++++++++++++++++++++++++++++++++++++++------------ kernel/bpf/verifier.c | 26 +++- kernel/trace/bpf_trace.c | 120 ++++++++++++++++- kernel/trace/ftrace.c | 7 +- net/bpf/bpf_dummy_struct_ops.c | 14 +- net/bpf/test_run.c | 3 + tools/include/uapi/linux/bpf.h | 10 ++ tools/lib/bpf/bpf.c | 9 ++ tools/lib/bpf/bpf.h | 5 + tools/lib/bpf/libbpf.c | 200 ++++++++++++++++++++++++++++ tools/lib/bpf/libbpf.h | 15 +++ tools/lib/bpf/libbpf.map | 1 + tools/testing/selftests/bpf/Makefile | 7 +- tools/testing/selftests/bpf/prog_tests/tracing_multi.c | 595 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/tracing_multi_attach.c | 26 ++++ tools/testing/selftests/bpf/progs/tracing_multi_bench.c | 13 ++ tools/testing/selftests/bpf/progs/tracing_multi_check.c | 165 ++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c | 42 ++++++ tools/testing/selftests/bpf/progs/tracing_multi_session_attach.c | 27 ++++ 30 files changed, 1874 insertions(+), 248 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/tracing_multi.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_attach.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_bench.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_check.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_session_attach.c
