Hi Jiri and Alexei, Here is the 2nd version of fprobe. This version uses the ftrace_set_filter_ips() for reducing the registering overhead. Note that this also drops per-probe point private data, which is not used anyway. This introduces the fprobe, the function entry/exit probe with multiple probe point support. This also introduces the rethook for hooking function return as same as kretprobe does. This abstraction will help us to generalize the fgraph tracer, because we can just switch it from rethook in fprobe, depending on the kernel configuration. The patch [1/8] and [7/8] are from your series[1]. Other libbpf patches will not be affected by this change. [1] https://lore.kernel.org/all/20220104080943.113249-1-jolsa@xxxxxxxxxx/T/#u I also added an out-of-tree (just for testing) patch at the end of this series ([8/8]) for adding a wildcard support to the sample program. With that patch, it shows how long the registration will take; # time insmod fprobe_example.ko symbol='btrfs_*' [ 36.130947] fprobe_init: 1028 symbols found [ 36.177901] fprobe_init: Planted fprobe at btrfs_* real 0m 0.08s user 0m 0.00s sys 0m 0.07s Thank you, --- Jiri Olsa (2): ftrace: Add ftrace_set_filter_ips function bpf: Add kprobe link for attaching raw kprobes Masami Hiramatsu (6): fprobe: Add ftrace based probe APIs rethook: Add a generic return hook rethook: x86: Add rethook x86 implementation fprobe: Add exit_handler support fprobe: Add sample program for fprobe [DO NOT MERGE] Out-of-tree: Support wildcard symbol option to sample arch/x86/Kconfig | 1 arch/x86/kernel/Makefile | 1 arch/x86/kernel/rethook.c | 115 ++++++++++++++++++++ include/linux/bpf_types.h | 1 include/linux/fprobe.h | 57 ++++++++++ include/linux/ftrace.h | 3 + include/linux/rethook.h | 74 +++++++++++++ include/linux/sched.h | 3 + include/uapi/linux/bpf.h | 12 ++ kernel/bpf/syscall.c | 195 +++++++++++++++++++++++++++++++++- kernel/exit.c | 2 kernel/fork.c | 3 + kernel/kallsyms.c | 1 kernel/trace/Kconfig | 22 ++++ kernel/trace/Makefile | 2 kernel/trace/fprobe.c | 168 +++++++++++++++++++++++++++++ kernel/trace/ftrace.c | 54 ++++++++- kernel/trace/rethook.c | 226 +++++++++++++++++++++++++++++++++++++++ samples/Kconfig | 7 + samples/Makefile | 1 samples/fprobe/Makefile | 3 + samples/fprobe/fprobe_example.c | 154 +++++++++++++++++++++++++++ tools/include/uapi/linux/bpf.h | 12 ++ 23 files changed, 1103 insertions(+), 14 deletions(-) create mode 100644 arch/x86/kernel/rethook.c create mode 100644 include/linux/fprobe.h create mode 100644 include/linux/rethook.h create mode 100644 kernel/trace/fprobe.c create mode 100644 kernel/trace/rethook.c create mode 100644 samples/fprobe/Makefile create mode 100644 samples/fprobe/fprobe_example.c -- Masami Hiramatsu (Linaro) <mhiramat@xxxxxxxxxx>
