From: Jens Axboe <axboe@suse.de>
To: David Miller <davem@davemloft.net>
Cc: johnpol@2ka.mipt.ru, drepper@redhat.com,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: async network I/O, event channels, etc
Date: Thu, 27 Jul 2006 10:09:02 +0200 [thread overview]
Message-ID: <20060727080901.GG5282@suse.de> (raw)
In-Reply-To: <20060727.010255.87351515.davem@davemloft.net>
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
next prev parent reply other threads:[~2006-07-27 8:09 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-25 19:23 async network I/O, event channels, etc Ulrich Drepper
2006-07-25 20:25 ` Stephen Hemminger
2006-07-25 21:24 ` Ulrich Drepper
2006-07-25 22:01 ` David Miller
2006-07-25 22:55 ` Nicholas Miell
2006-07-26 6:28 ` Evgeniy Polyakov
2006-07-26 9:18 ` [0/4] kevent: generic event processing subsystem Evgeniy Polyakov
2006-07-26 9:18 ` [1/4] kevent: core files Evgeniy Polyakov
2006-07-26 9:18 ` [2/4] kevent: network AIO, socket notifications Evgeniy Polyakov
2006-07-26 9:18 ` [3/4] kevent: AIO, aio_sendfile() implementation Evgeniy Polyakov
2006-07-26 9:18 ` [4/4] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-07-26 10:00 ` [3/4] kevent: AIO, aio_sendfile() implementation Christoph Hellwig
2006-07-26 10:08 ` Evgeniy Polyakov
2006-07-26 10:13 ` Christoph Hellwig
2006-07-26 10:25 ` Evgeniy Polyakov
2006-07-26 10:04 ` Christoph Hellwig
2006-07-26 10:12 ` David Miller
2006-07-26 10:15 ` Christoph Hellwig
2006-07-26 20:21 ` Phillip Susi
2006-07-26 14:14 ` Avi Kivity
2006-07-26 10:19 ` Evgeniy Polyakov
2006-07-26 10:30 ` Christoph Hellwig
2006-07-26 14:28 ` Ulrich Drepper
2006-07-26 16:22 ` Badari Pulavarty
2006-07-27 6:49 ` Sébastien Dugué
2006-07-27 15:28 ` Badari Pulavarty
2006-07-27 18:14 ` Zach Brown
2006-07-27 18:29 ` Badari Pulavarty
2006-07-27 18:44 ` Ulrich Drepper
2006-07-27 21:02 ` Badari Pulavarty
2006-07-28 7:31 ` Sébastien Dugué
2006-07-28 12:58 ` Sébastien Dugué
2006-08-11 19:45 ` Ulrich Drepper
2006-08-12 18:29 ` Kernel patches enabling better POSIX AIO (Was Re: [3/4] kevent: AIO, aio_sendfile) Suparna Bhattacharya
2006-08-12 19:10 ` Ulrich Drepper
2006-08-12 19:28 ` Jakub Jelinek
2006-09-04 14:37 ` Sébastien Dugué
2006-08-14 7:02 ` Suparna Bhattacharya
2006-08-14 16:38 ` Ulrich Drepper
2006-08-15 2:06 ` Nicholas Miell
2006-09-04 14:36 ` Sébastien Dugué
2006-09-04 14:28 ` Sébastien Dugué
2006-07-28 7:29 ` [3/4] kevent: AIO, aio_sendfile() implementation Sébastien Dugué
2006-07-31 10:11 ` Suparna Bhattacharya
2006-07-28 7:26 ` Sébastien Dugué
2006-07-26 10:31 ` [1/4] kevent: core files Andrew Morton
2006-07-26 10:37 ` Evgeniy Polyakov
2006-07-26 10:44 ` Evgeniy Polyakov
2006-07-27 6:10 ` async network I/O, event channels, etc David Miller
2006-07-27 7:49 ` Evgeniy Polyakov
2006-07-27 8:02 ` David Miller
2006-07-27 8:09 ` Jens Axboe [this message]
2006-07-27 8:11 ` Jens Axboe
2006-07-27 8:20 ` David Miller
2006-07-27 8:29 ` Jens Axboe
2006-07-27 8:37 ` David Miller
2006-07-27 8:39 ` Jens Axboe
2006-07-27 8:58 ` Evgeniy Polyakov
2006-07-27 9:31 ` David Miller
2006-07-27 9:37 ` Evgeniy Polyakov
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