hi, this patchset is adding support to attach multiple uprobes and usdt probes through new uprobe_multi link. The current uprobe is attached through the perf event and attaching many uprobes takes a lot of time because of that. The main reason is that we need to install perf event for each probed function and profile shows perf event installation (perf_install_in_context) as culprit. The new uprobe_multi link just creates raw uprobes and attaches the bpf program to them without perf event being involved. In addition to being faster we also save file descriptors. For the current uprobe attach we use extra perf event fd for each probed function. The new link just need one fd that covers all the functions we are attaching to. v5 changes: - fixed BPF_LINK_CREATE_LAST_FIELD [Yafang Shao] - rebased to latest bpf-next/master - small changes in pid test There's support for bpftrace [2] and tetragon [1]. Also available at: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git uprobe_multi thanks, jirka [1] https://github.com/cilium/tetragon/pull/936 [2] https://github.com/iovisor/bpftrace/compare/master...olsajiri:bpftrace:uprobe_multi [3] https://lore.kernel.org/bpf/20230628115329.248450-1-laoar.shao@xxxxxxxxx/ --- Jiri Olsa (28): bpf: Switch BPF_F_KPROBE_MULTI_RETURN macro to enum bpf: Add attach_type checks under bpf_prog_attach_check_attach_type bpf: Add multi uprobe link bpf: Add cookies support for uprobe_multi link bpf: Add pid filter support for uprobe_multi link bpf: Add bpf_get_func_ip helper support for uprobe link libbpf: Add uprobe_multi attach type and link names libbpf: Move elf_find_func_offset* functions to elf object libbpf: Add elf_open/elf_close functions libbpf: Add elf symbol iterator libbpf: Add elf_resolve_syms_offsets function libbpf: Add elf_resolve_pattern_offsets function libbpf: Add bpf_link_create support for multi uprobes libbpf: Add bpf_program__attach_uprobe_multi function libbpf: Add support for u[ret]probe.multi[.s] program sections libbpf: Add uprobe multi link detection libbpf: Add uprobe multi link support to bpf_program__attach_usdt selftests/bpf: Move get_time_ns to testing_helpers.h selftests/bpf: Add uprobe_multi skel test selftests/bpf: Add uprobe_multi api test selftests/bpf: Add uprobe_multi link test selftests/bpf: Add uprobe_multi test program selftests/bpf: Add uprobe_multi bench test selftests/bpf: Add uprobe_multi usdt test code selftests/bpf: Add uprobe_multi usdt bench test selftests/bpf: Add uprobe_multi cookie test selftests/bpf: Add uprobe_multi pid filter tests selftests/bpf: Add extra link to uprobe_multi tests include/linux/trace_events.h | 6 ++ include/uapi/linux/bpf.h | 22 ++++- kernel/bpf/syscall.c | 134 ++++++++++++++-------------- kernel/trace/bpf_trace.c | 346 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- tools/include/uapi/linux/bpf.h | 22 ++++- tools/lib/bpf/Build | 2 +- tools/lib/bpf/bpf.c | 11 +++ tools/lib/bpf/bpf.h | 11 ++- tools/lib/bpf/elf.c | 440 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/lib/bpf/libbpf.c | 388 ++++++++++++++++++++++++++++++++++++++++++--------------------------------------- tools/lib/bpf/libbpf.h | 51 +++++++++++ tools/lib/bpf/libbpf.map | 1 + tools/lib/bpf/libbpf_internal.h | 21 +++++ tools/lib/bpf/usdt.c | 116 ++++++++++++++++-------- tools/testing/selftests/bpf/Makefile | 5 ++ tools/testing/selftests/bpf/bench.h | 9 -- tools/testing/selftests/bpf/prog_tests/bpf_cookie.c | 78 +++++++++++++++++ tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c | 8 -- tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c | 415 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/uprobe_multi.c | 101 +++++++++++++++++++++ tools/testing/selftests/bpf/progs/uprobe_multi_bench.c | 15 ++++ tools/testing/selftests/bpf/progs/uprobe_multi_usdt.c | 16 ++++ tools/testing/selftests/bpf/testing_helpers.h | 10 +++ tools/testing/selftests/bpf/uprobe_multi.c | 91 +++++++++++++++++++ 24 files changed, 1996 insertions(+), 323 deletions(-) create mode 100644 tools/lib/bpf/elf.c create mode 100644 tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi.c create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_bench.c create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_usdt.c create mode 100644 tools/testing/selftests/bpf/uprobe_multi.c
