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    SubjectRe: [PATCH][RFC] kprobes: Add user entry-handler in kretprobes
    Abhishek Sagar wrote:

    > the entry handler is called with the appropriate return instance. I
    > haven't put any explicit "match" test here for ri. The reason is that
    > the correct ri would be passed to both the entry and return handlers
    > as trampoline_handler() explicitly matches them to the correct task.
    > Note that all pending return instances of a function are chained in
    > LIFO order. S the entry-handler which gets called last, should have
    > its return handler called first (in case of multiple pending return
    > instances).

    No, eventhough return instances are chained in an order, order of execution of
    return handler entirely depends on which process returns first(some process may
    return from 2 line of the function and some process may return from last line
    of the function). So entry_handler() which gets executed last doesn't guarantee
    that its return handler will be executed first(because it took a lot time
    to return).

    So only thing to match the entry_handler() with its return_handler() is
    return probe instance(ri)'s address, which user has to take care explicitly
    (Hence I feel sol a) would be nice).

    Srinivasa DS

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      Last update: 2007-11-14 11:27    [W:0.027 / U:2.484 seconds]
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