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    SubjectRe: [patch 1/4] Add routine for generating an ID for kernel pointer
    On Fri, Dec 30, 2011 at 06:51:37PM -0500, KOSAKI Motohiro wrote:
    > >
    > >Guys, this become more and more complex, finally I fear someone
    > >propose to do ideal hashing run-time ;) Maybe we can step back and
    > >live with root-only and plain pointers here? I'm not sure who else
    > >might need such facility except us, and if once there will be a candidate
    > >-- we could take a look on hashing again and provide safe hashes there. No?
    > But recently kernel security fashion are, we don't expose a kernel
    > pointer at all even though the file is root only. I'm not sure how
    > much effective such fashion. but you seems run opposite way.
    > I doubt user land can implement good comparison way. Why you gave up
    > Andrew's sys_are_these_files_the_same() idea?

    Because of speed, as Pavel mentioned
    | With this the complexity of determining sharing for N files scattered across
    | several tasks would be N^2, since we'll have to compare each file to each file.
    | On the other hand having just N IDs at hands would allow us to use more
    | efficient algorithms resulting in e.g. N*log(N) complexity.


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