KPROBES_ON_FTRACE avoids much of the overhead with regular kprobes as it eliminates the need for a trap, as well as the need to emulate or single-step instructions. Applied after arm64 FTRACE_WITH_REGS: http://lists.infradead.org/pipermail/linux-arm-kernel/2019-August/674404.html Changes since v1: - make the kprobes/x86: use instruction_pointer and instruction_pointer_set as patch1 - add Masami's ACK to patch1 - add some description about KPROBES_ON_FTRACE and why we need it on arm64 - correct the log before the patch - remove the consolidation patch, make it as TODO - only adjust kprobe's addr when KPROBE_FLAG_FTRACE is set - if KPROBES_ON_FTRACE, ftrace_call_adjust() the kprobe's addr before calling ftrace_location() - update the kprobes-on-ftrace/arch-support.txt in doc Jisheng Zhang (3): kprobes/x86: use instruction_pointer and instruction_pointer_set kprobes: adjust kprobe addr for KPROBES_ON_FTRACE arm64: implement KPROBES_ON_FTRACE .../debug/kprobes-on-ftrace/arch-support.txt | 2 +- arch/arm64/Kconfig | 1 + arch/arm64/kernel/probes/Makefile | 1 + arch/arm64/kernel/probes/ftrace.c | 60 +++++++++++++++++++ arch/x86/kernel/kprobes/ftrace.c | 9 +-- kernel/kprobes.c | 10 +++- 6 files changed, 75 insertions(+), 8 deletions(-) create mode 100644 arch/arm64/kernel/probes/ftrace.c -- 2.23.0.rc1
