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    SubjectRe: [PATCH 0/2] /proc/stat: Reduce irqs counting performance overhead
    On Mon, Jan 07, 2019 at 05:41:28PM -0500, Daniel Colascione wrote:
    > There should be a general-purpose way for /proc file readers to tell
    > the kernel which bits of information interest them on a particular read
    > syscall sequence or particular open(2) or something.

    This opens a pandora box full of ioctls. /proc supports ioctls on files
    which aren't /proc/$PID and /proc/sys/* though.

    So people made a mess with allegedly easy text files and now they
    continue to make even more mess adding ioctls on top.

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