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    SubjectRe: read_proc issue
    On Wed, Feb 27, 2002 at 09:42:04PM +0000, Alan Cox wrote:
    > > I've encountered this problem before, too. What is the "One True Way"
    > > to do this cleanly? In other words, if you want to do a calculation
    > > once every time someone runs "cat /proc/foo", what is the cleanest way
    > > to do that? The solution we came up with was to check the file offset
    > > and only do the calculation if offset == 0, which seems pretty
    > > hackish.
    >
    > Another approach is to do the calculation open and remember it in per
    > fd private data. You can recover that and free it on release. It could
    > even be a buffer holding the actual "content"

    It might also be an idea to export proc_calc_metrics() from
    fs/proc/proc_misc.c because quite a lot of code actually tries to do
    exactly the same.


    Erik

    --
    J.A.K. (Erik) Mouw, Information and Communication Theory Group, Faculty
    of Information Technology and Systems, Delft University of Technology,
    PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2783635
    Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl
    WWW: http://www-ict.its.tudelft.nl/~erik/
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