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    SubjectRe: [PATCH 2.6.x] additional kernel event notifications
    On Mon, Sep 22, 2003 at 06:16:14PM -0700, Villacis, Juan wrote:

    > There are several languages and tools besides Java which can jit code.
    > Perl6 (using interpreters like Parrot) and Python (using interpreters
    > like Psycho) are examples of this and it is not yet clear what
    > interfaces they will provide to allow for JVMPI like functionality. We

    First, "we might need it" is not generally considered a good enough
    rationale for extra code by the kernel people.

    Second, if there is no help from a runtime for tracking JITted code
    memory -> source lines, I do not see how your hooks could possibly help.
    Either way you need help from the VM of the target program (be it
    Parrot, Python or whatever).

    > would still like to be able to provide something useful to the users of

    What would "something useful" be in particular ?

    > From what we can see in the Oprofile driver code, if there is no dcookie
    > for a corresponding EIP, the EIP information is discarded and the


    But we're talking about making oprofile useful for your purposes - that
    can and will involve changes. In particular it's trivial to add an
    option to oprofile to output the raw EIP is no dentry could be matched.

    > As long as there exists a userspace API similar to the JVMPI for a
    > particular DGC generator, and as long as the profiling tool is using
    > that API, then yes, it seems like this method would work. But this
    > isn't the case we are worried about.

    I hate to be a pain, but I'm still missing a concrete explanation of an
    *actual* case you are worried about. It's rather difficult to discuss
    this stuff in the abstract.

    Khendon's Law:
    If the same point is made twice by the same person, the thread is over.
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