[lkml]   [2000]   [Oct]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] kiobuf/rawio fixes for 2.4.0-test10-pre6
    Christoph Hellwig wrote:
    > +Locking down user memory and doing mass storage device IO with it is not
    > +the only purpose of kiobufs. Another use for kiobufs is allowing
    > +user-space mmaping dma memory, e.g in sound drivers. To do so you
    > +need to lock-down kernel virtual memory and refernece it using kiobufs.
    > +The code that does exactly this is not yet in the kernel - get Stephen
    > +Tweedie's kiobuf patchset if you want to use this.

    Take a look at drivers/sound/via82cxxx_audio.c. How can that mmap be
    improved by using kiobufs?

    It seems like there is less overhead to mmap(2) DMA memory the way I do
    it currently -- without kiobufs...

    Honestly interested,


    Jeff Garzik | "Mind if I drive?" -Sam
    Building 1024 | "Not if you don't mind me clawing at the
    MandrakeSoft | dash and shrieking like a cheerleader."
    | -Max
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 12:45    [W:0.020 / U:6.912 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site