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    SubjectRe: explicit dcache <-> user-space cache coherency, sys_mark_dir_clean(), O_CLEAN
    Christer Weinigel wrote:
    > > long sys_mark_dir_clean(dirfd);
    > >
    > > the syscall returns whether the directory was valid/clean already.
    >
    > Isn't this rather bad, it's only possible to have one process that
    > does this magic clean bit thing. Other applications such as Wine or
    > a DOS emulator might want to get the same speedups.

    No. The magic clean bit is associated with dirfd - different file
    descriptors have separate magic clean bits.

    > Add a new create syscall with the same idea as your one bit syscall,
    > which checks that the generation number matches. If the generation
    > number doesn't match the create call fails.
    >
    > int create_synchronized(name, mode, generation);

    Hmm. That's an interesting idea.

    -- Jamie
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