Hi, Here is the 6th version of fprobe. This version changes fprobe interface accroding to the discussion with Steve, adds a new flag for compatibility with the kprobes, and fixes some issues pointed in the previous version. The previous version is here[1]; [1] https://lore.kernel.org/all/164311269435.1933078.6963769885544050138.stgit@devnote2/T/#u This series 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 [1/10] is from Jiri's series[2]. [2] https://lore.kernel.org/all/20220104080943.113249-1-jolsa@xxxxxxxxxx/T/#u I update this patch to fix typo and add a comment as Steve pointed. I also found that the fprobe spec about recursion is a bit different from kprobes. This may be a problem if user wants to run the same code from fprobe and the kprobes. To avoid this issue, I introduced the FPROBE_FL_KPROBE_SHARED flag[9/10]. I would like to confirm that the eBPF is recursion safe or detect recursion by itself. If not, please try the above flag. Thank you, --- Jiri Olsa (1): ftrace: Add ftrace_set_filter_ips function Masami Hiramatsu (9): fprobe: Add ftrace based probe APIs rethook: Add a generic return hook rethook: x86: Add rethook x86 implementation ARM: rethook: Add rethook arm implementation arm64: rethook: Add arm64 rethook implementation fprobe: Add exit_handler support fprobe: Add sample program for fprobe fprobe: Introduce FPROBE_FL_KPROBE_SHARED flag for fprobe docs: fprobe: Add fprobe description to ftrace-use.rst Documentation/trace/fprobe.rst | 161 ++++++++++++ Documentation/trace/index.rst | 1 arch/arm/Kconfig | 1 arch/arm/include/asm/stacktrace.h | 4 arch/arm/kernel/stacktrace.c | 6 arch/arm/probes/Makefile | 1 arch/arm/probes/rethook.c | 71 +++++ arch/arm64/Kconfig | 1 arch/arm64/include/asm/stacktrace.h | 2 arch/arm64/kernel/probes/Makefile | 1 arch/arm64/kernel/probes/rethook.c | 25 ++ arch/arm64/kernel/probes/rethook_trampoline.S | 87 ++++++ arch/arm64/kernel/stacktrace.c | 7 - arch/x86/Kconfig | 1 arch/x86/include/asm/unwind.h | 8 + arch/x86/kernel/Makefile | 1 arch/x86/kernel/kprobes/common.h | 1 arch/x86/kernel/rethook.c | 115 ++++++++ include/linux/fprobe.h | 97 +++++++ include/linux/ftrace.h | 3 include/linux/kprobes.h | 3 include/linux/rethook.h | 100 +++++++ include/linux/sched.h | 3 kernel/exit.c | 2 kernel/fork.c | 3 kernel/trace/Kconfig | 25 ++ kernel/trace/Makefile | 2 kernel/trace/fprobe.c | 339 +++++++++++++++++++++++++ kernel/trace/ftrace.c | 58 ++++ kernel/trace/rethook.c | 313 +++++++++++++++++++++++ samples/Kconfig | 7 + samples/Makefile | 1 samples/fprobe/Makefile | 3 samples/fprobe/fprobe_example.c | 120 +++++++++ 34 files changed, 1559 insertions(+), 14 deletions(-) create mode 100644 Documentation/trace/fprobe.rst create mode 100644 arch/arm/probes/rethook.c create mode 100644 arch/arm64/kernel/probes/rethook.c create mode 100644 arch/arm64/kernel/probes/rethook_trampoline.S 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>
