Ingo Molnar wrote: >* Zachary Amsden <zach@xxxxxxxxxx> wrote: > > > >>>I believe user space kprobes are being worked on by some IBM India folks >>>yes. >>> >>> >>I'm convinced this is pointless. What does it buy you over a ptrace >>based debugger? Why would you want extra code running in the kernel >>that can be done perfectly well in userspace? >> >> > >kprobes are not just for 'debuggers', they are also used for tracing and >other dynamic instrumentation in projects like systemtap. Ptrace is way >too slow and limited for things like that. > > Well, if there is a justification for it, that means we really should handle all the nasty EIP conversion cases due to segmentation and v8086 mode in the kprobes code. I was hoping that might not be the case. Zach
