Hello Jiri, Here is the 4th version of fprobe. I fixed some issues on fprobe and rethook. I dropped out-of-tree patches and Jiri's bpf patch and add rethook arm/arm64 support and fprobe documentation. The previous version is here[1]; [1] https://lore.kernel.org/all/164260419349.657731.13913104835063027148.stgit@devnote2/T/#u The biggest change of this version is supporting ftrace location conversion correctly. Previous version can not find ftrace location if the dynamic ftrace nop is not placed a the symbol address. 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 [1/9] is from Jiri's series[2]. [2] https://lore.kernel.org/all/20220104080943.113249-1-jolsa@xxxxxxxxxx/T/#u I'll continue porting rethook to other archs, and after that replace the current kretprobe with the rethook. This design change will make the fgraph/kretprobe integration easier because if fgraph is not available, kretprobe can use rethook. Thank you, --- Jiri Olsa (1): ftrace: Add ftrace_set_filter_ips function Masami Hiramatsu (8): 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 docs: fprobe: Add fprobe description to ftrace-use.rst Documentation/trace/fprobe.rst | 131 +++++++++++ Documentation/trace/index.rst | 1 arch/arm/Kconfig | 1 arch/arm/kernel/stacktrace.c | 4 arch/arm/probes/Makefile | 1 arch/arm/probes/rethook.c | 71 ++++++ arch/arm64/Kconfig | 1 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 | 3 arch/x86/Kconfig | 1 arch/x86/include/asm/unwind.h | 4 arch/x86/kernel/Makefile | 1 arch/x86/kernel/rethook.c | 115 +++++++++ include/linux/fprobe.h | 86 +++++++ include/linux/ftrace.h | 3 include/linux/rethook.h | 99 ++++++++ include/linux/sched.h | 3 kernel/exit.c | 2 kernel/fork.c | 3 kernel/trace/Kconfig | 24 ++ kernel/trace/Makefile | 2 kernel/trace/fprobe.c | 198 ++++++++++++++++ kernel/trace/ftrace.c | 53 ++++ kernel/trace/rethook.c | 311 +++++++++++++++++++++++++ samples/Kconfig | 7 + samples/Makefile | 1 samples/fprobe/Makefile | 3 samples/fprobe/fprobe_example.c | 103 ++++++++ 30 files changed, 1336 insertions(+), 9 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>
