Messages in this thread | | | Date | Wed, 14 Nov 2007 15:53:58 +0530 | From | Srinivasa Ds <> | Subject | Re: [PATCH][RFC] kprobes: Add user entry-handler in kretprobes |
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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).
Thanks Srinivasa DS
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