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    SubjectRe: f_ops flag to speed up compatible ioctls in linux kernel
    Please do not mail me directly.

    Quoting ( "Re: f_ops flag to speed up compatible ioctls in linux kernel":
    > On Wed, Sep 01, 2004 at 10:22:45AM +0300, Michael S. Tsirkin wrote:
    > > 2. there's a performance huge overhead for each compat call - there's
    > > a hash lookup in a global hash inside a lock_kernel -
    > > and I think compat performance *is* important.
    > >
    > > Further, adding a command to the ioctl suddenly requires changing
    > > two places - registration code and ioctl itself.
    > So don't add them. Adding a new ioctl is *NOT* a step to be taken lightly -
    > we used to be far too accepting in that area and as somebody who'd waded
    > through the resulting dungpiles over the last months I can tell you that
    > result is utterly revolting.

    Why make it a bigger dungpile then?
    And what about the performance overhead?

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