Hi,
I noticed that the kprobe x86 still has an inefficient code.
Currently kprobes x86 decodes opcode right after single
stepping in resume_execution(), which is kprobe's hot path.
But it already decoded the opcode while preparing
arch_specific_insn in arch_copy_kprobe(), so this is
inefficient.
So decode the opcode while preparing kprobes (arch_copy_kprobe())
instead of resume_execution() and set some flags for resuming from
single stepping. This also removes the custom instruction prefix
decoding, which should be done in x86 instruction decoder.
Thank you,
---
Masami Hiramatsu (1):
x86/kprobes: Do not decode opcode in resume_execution()
arch/x86/include/asm/kprobes.h | 11 ++-
arch/x86/kernel/kprobes/core.c | 166 ++++++++++++++++++----------------------
2 files changed, 80 insertions(+), 97 deletions(-)
--
Masami Hiramatsu (Linaro) <mhira...@kernel.org>
