lkml.org 
[lkml]   [2006]   [Jul]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: async network I/O, event channels, etc
    On Thu, Jul 27 2006, David Miller wrote:
    > From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
    > Date: Thu, 27 Jul 2006 11:49:02 +0400
    >
    > > I.e. map skb's data to userspace? Not a good idea especially with it's
    > > tricky lifetime and unability for userspace to inform kernel when it
    > > finished and skb can be freed (without additional syscall).
    >
    > Hmmm...
    >
    > If it is paged based, I do not see the problem. Events and calls to
    > AIO I/O routines make transfer of buffer ownership. The fact that
    > while kernel (and thus networking stack) "owns" the buffer for an AIO
    > call, the user can have a valid mapping to it is a unimportant detail.

    Ownership may be clear, but "when can I reuse" is tricky. The same issue
    comes up for vmsplice -> splice to socket.

    --
    Jens Axboe

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2006-07-27 10:11    [W:3.344 / U:0.660 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site