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    SubjectRe: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)
    On Tue, Jan 19, 2010 at 09:47:45AM -0800, Jim Keniston wrote:
    > > Do you have plans for a variant
    > > that's completely in userspace?
    >
    > I don't know of any such plans, but I'd be interested to read more of
    > your thoughts here. As I understand it, you've suggested replacing the
    > probed instruction with a jump into an instrumentation vma (the XOL
    > area, or something similar). Masami has demonstrated -- through his
    > djprobes enhancement to kprobes -- that this can be done for many x86
    > instructions.
    >
    > What does the code in the jumped-to vma do? Is the instrumentation code
    > that corresponds to the uprobe handlers encoded in an ad hoc .so?


    Once the instrumentation is requested by a process that is not the
    instrumented one, this looks impossible to set a uprobe without a
    minimal voluntary collaboration from the instrumented process
    (events sent through IPC or whatever). So that looks too limited,
    this is not anymore a true dynamic uprobe.



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