On Thu, Jul 27 2006, Jens Axboe wrote: > On Thu, Jul 27 2006, David Miller wrote: > > From: Evgeniy Polyakov <[EMAIL PROTECTED]> > > 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.
Ownership transition from user -> kernel that is, what I'm trying to say that returning ownership to the user again is the tricky part. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
