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    SubjectRe: [RFC][PATCH] linux-2.6.2-rc2_vsyscall-gtod_B1.patch
    Ulrich Drepper wrote:
    > ~ alternatively use the symbol table the vdso has. Export the new code
    > only via the symbol table. No fixed address for the function, the
    > runtime gets it from the symbol table. glibc will use weak symbol
    > references; if the symbol isn't there, the old code is used. This will
    > require that every single optimized syscall needs to be handled special.
    >
    >
    > I personally like the first approach better. The indirection table can
    > maintained in sync with the syscall table inside the kernel. It all
    > comes at all times from the same source. The overhead of the memory
    > load should be neglectable.

    I like the second approach more. You can change glibc to look up the
    weak symbol for _all_ syscalls, then none of them are special and it
    will work with future kernel optimisations.

    -- Jamie
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