Ingo Molnar wrote:
* Zachary Amsden <[email protected]> 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
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