From: Hans Henrik Happe <hhh@imada•sdu.dk>
To: netdev@vger•kernel.org
Subject: Re: [RFC 1/4] kevent: core files.
Date: Sat, 29 Jul 2006 18:36:17 +0200 [thread overview]
Message-ID: <200607291836.18514.hhh@imada.sdu.dk> (raw)
In-Reply-To: <44CB8A67.3060801@redhat.com>
On Saturday 29 July 2006 18:18, Ulrich Drepper wrote:
> Evgeniy Polyakov wrote:
> > Btw, why do we want mapped ring of ready events?
> > If user requestd some event, he definitely wants to get them back when
> > they are ready, and not to check and then get them?
> > Could you please explain more on this issue?
>
> If of course makes no sense to enter the kernel to actually get the
> event. This should be done by storing the event in the ring buffer.
> I.e., there are two ways to get an event:
>
> - with a syscall. This can report as many events at once as the caller
> provides space for. And no event which is reported in the run buffer
> should be reported this way
>
> - if there is space, report it in the ring buffer. Yes, the buffer
> can be optional, then all events are reported by the system call.
>
>
> So the use case would be like this:
>
>
> wait_and_get_event:
>
> is buffer empty ?
>
> yes -> make syscall
>
> no -> get event from buffer
>
>
> To avoid races, the syscall needs to take a parameter indicating the
> last event checked out from the buffer. If in the meantime the kernel
> put another event in the buffer the syscall immediately returns.
> Similar to what we do in the futex syscall.
Couldn't this be done in a general way: Given a fd that supports streaming
input, map some user-mem as a ring buffer for input. Maybe the kernel should
control the buffer in order to make resizing possible (i.e., TCP zero-copy
and window scaling).
Hans Henrik
next prev parent reply other threads:[~2006-07-29 16:36 UTC|newest]
Thread overview: 180+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-09 13:24 [RFC 1/4] kevent: core files Evgeniy Polyakov
2006-07-09 14:59 ` Pekka Enberg
2006-07-09 15:08 ` Evgeniy Polyakov
2006-07-25 6:17 ` David Miller
2006-07-25 6:26 ` Evgeniy Polyakov
2006-07-27 19:18 ` Zach Brown
2006-07-27 20:06 ` Evgeniy Polyakov
2006-07-27 21:32 ` Zach Brown
2006-07-28 5:23 ` Evgeniy Polyakov
2006-07-28 18:33 ` Zach Brown
2006-07-28 18:44 ` Evgeniy Polyakov
2006-07-28 19:10 ` Zach Brown
2006-07-29 3:38 ` Ulrich Drepper
2006-07-29 4:32 ` Nicholas Miell
2006-07-29 15:48 ` Evgeniy Polyakov
2006-07-29 20:54 ` Nicholas Miell
2006-07-30 8:08 ` Ulrich Drepper
2006-07-29 15:44 ` Evgeniy Polyakov
2006-07-29 16:18 ` Ulrich Drepper
2006-07-29 16:36 ` Hans Henrik Happe [this message]
2006-07-31 10:33 ` Evgeniy Polyakov
2006-07-31 10:35 ` Herbert Xu
2006-07-31 10:50 ` Evgeniy Polyakov
2006-07-31 10:57 ` David Miller
2006-07-31 10:59 ` Herbert Xu
2006-08-01 7:53 ` Ulrich Drepper
2006-08-01 7:58 ` David Miller
2006-07-31 19:41 ` Evgeniy Polyakov
2006-07-31 22:00 ` David Miller
2006-07-31 22:16 ` Brent Cook
2006-07-31 22:20 ` David Miller
2006-08-01 6:24 ` Evgeniy Polyakov
2006-07-31 22:46 ` Zach Brown
2006-08-01 9:34 ` [take2 0/4] kevent: introduction Evgeniy Polyakov
2006-08-01 9:34 ` [take2 1/4] kevent: core files Evgeniy Polyakov
2006-08-01 9:34 ` [take2 2/4] kevent: network AIO, socket notifications Evgeniy Polyakov
2006-08-01 9:34 ` [take2 4/4] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-01 9:34 ` [take2 3/4] kevent: AIO, aio_sendfile() implementation Evgeniy Polyakov
2006-08-01 13:46 ` [take2 1/4] kevent: core files James Morris
2006-08-01 13:55 ` Evgeniy Polyakov
2006-08-01 14:27 ` James Morris
2006-08-01 14:34 ` Evgeniy Polyakov
2006-08-01 23:56 ` Zach Brown
2006-08-02 0:01 ` David Miller
2006-08-02 6:43 ` Evgeniy Polyakov
2006-08-02 6:39 ` Evgeniy Polyakov
2006-08-02 7:25 ` David Miller
2006-08-02 7:46 ` Evgeniy Polyakov
2006-08-03 9:45 ` [take3 0/4] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-03 9:40 ` Evgeniy Polyakov
2006-08-03 9:46 ` [take3 1/4] kevent: Core files Evgeniy Polyakov
2006-08-03 9:46 ` [take3 2/4] kevent: AIO, aio_sendfile() implementation Evgeniy Polyakov
2006-08-03 9:46 ` [take3 3/4] kevent: Network AIO, socket notifications Evgeniy Polyakov
2006-08-03 9:46 ` [take3 4/4] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-03 9:43 ` Eric Dumazet
2006-08-03 9:48 ` Evgeniy Polyakov
2006-08-03 9:54 ` [take3 3/4] kevent: Network AIO, socket notifications Eric Dumazet
2006-08-03 10:13 ` Evgeniy Polyakov
2006-08-03 17:04 ` [take3 2/4] kevent: AIO, aio_sendfile() implementation Badari Pulavarty
2006-08-03 17:13 ` Evgeniy Polyakov
2006-08-03 14:40 ` [take3 1/4] kevent: Core files Eric Dumazet
2006-08-03 14:55 ` Evgeniy Polyakov
2006-08-03 15:11 ` Eric Dumazet
2006-08-03 15:21 ` Evgeniy Polyakov
2006-08-03 21:37 ` David Miller
2006-08-05 13:02 ` [take4 0/4] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-05 13:02 ` [take4 1/4] kevent: Core files Evgeniy Polyakov
2006-08-05 13:02 ` [take4 2/4] kevent: AIO, aio_sendfile() implementation Evgeniy Polyakov
2006-08-05 13:02 ` [take4 3/4] kevent: Network AIO, socket notifications Evgeniy Polyakov
2006-08-05 13:02 ` [take4 4/4] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-05 17:57 ` [take4 1/4] kevent: Core files Greg KH
2006-08-05 18:10 ` Evgeniy Polyakov
2006-08-08 7:44 ` [take5 0/4] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-08 7:44 ` [take5 1/4] kevent: Core files Evgeniy Polyakov
2006-08-08 7:44 ` [take5 2/4] kevent: AIO, aio_sendfile() implementation Evgeniy Polyakov
2006-08-08 7:44 ` [take5 3/4] kevent: Network AIO, socket notifications Evgeniy Polyakov
2006-08-08 7:44 ` [take5 4/4] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-08 9:52 ` [take5 3/4] kevent: Network AIO, socket notifications Eric Dumazet
2006-08-08 10:02 ` Evgeniy Polyakov
2006-08-08 22:02 ` [take5 1/4] kevent: Core files Zach Brown
2006-08-09 5:22 ` Evgeniy Polyakov
2006-08-08 21:32 ` [take5 0/4] kevent: Generic event handling mechanism Zach Brown
2006-08-09 5:31 ` Evgeniy Polyakov
2006-08-09 5:52 ` David Miller
2006-08-09 6:11 ` Evgeniy Polyakov
2006-08-09 6:25 ` Evgeniy Polyakov
2006-08-09 6:31 ` David Miller
2006-08-09 6:49 ` Evgeniy Polyakov
2006-08-09 6:57 ` Ulrich Drepper
2006-08-09 7:00 ` David Miller
2006-08-09 7:00 ` Evgeniy Polyakov
2006-08-09 8:34 ` Christoph Hellwig
2006-08-09 8:45 ` Andrew Morton
2006-08-09 8:02 ` [take6 0/3] " Evgeniy Polyakov
2006-08-09 7:58 ` David Miller
2006-08-09 8:07 ` Evgeniy Polyakov
2006-08-09 8:20 ` David Miller
2006-08-09 8:24 ` Evgeniy Polyakov
2006-08-09 8:02 ` [take6 1/3] kevent: Core files Evgeniy Polyakov
2006-08-09 8:02 ` [take6 3/3] kevent: Network AIO, socket notifications Evgeniy Polyakov
2006-08-09 8:02 ` [take6 2/3] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-09 17:47 ` [take6 1/3] kevent: Core files Stephen Hemminger
2006-08-09 19:17 ` Evgeniy Polyakov
2006-08-10 0:04 ` David Miller
2006-08-09 22:21 ` Andrew Morton
2006-08-10 6:14 ` Evgeniy Polyakov
2006-08-10 6:42 ` David Miller
2006-08-10 6:48 ` Evgeniy Polyakov
2006-08-10 7:18 ` Andrew Morton
2006-08-10 7:50 ` Evgeniy Polyakov
2006-08-10 8:02 ` Andrew Morton
2006-08-10 8:22 ` Evgeniy Polyakov
2006-08-11 0:56 ` Andrew Morton
2006-08-11 6:15 ` Evgeniy Polyakov
2006-08-11 6:23 ` Andrew Morton
2006-08-11 6:30 ` Evgeniy Polyakov
2006-08-11 7:04 ` Andrew Morton
2006-08-11 7:27 ` Evgeniy Polyakov
2006-08-11 6:25 ` Ulrich Drepper
2006-08-11 6:33 ` Evgeniy Polyakov
2006-08-11 6:38 ` David Miller
2006-08-11 6:55 ` Evgeniy Polyakov
2006-08-10 12:12 ` [take7 0/1] kevent: generic event handling mechanism Evgeniy Polyakov
2006-08-10 12:16 ` [take7 1/1] kevent: core files and timer/poll notifications Evgeniy Polyakov
2006-08-10 12:22 ` Evgeniy Polyakov
2006-08-11 8:40 ` [take8 0/2] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-11 8:40 ` [take8 1/2] kevent: Core files Evgeniy Polyakov
2006-08-11 8:40 ` [take8 2/2] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-11 15:45 ` Andrew Morton
2006-08-12 8:18 ` Evgeniy Polyakov
2006-08-12 8:38 ` Andrew Morton
2006-08-12 8:55 ` Evgeniy Polyakov
2006-08-13 0:51 ` [take8 1/2] kevent: Core files Jeff Carr
2006-08-13 9:04 ` Evgeniy Polyakov
2006-08-14 6:20 ` [take8 0/2] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-14 6:20 ` [take8 1/2] kevent: Core files Evgeniy Polyakov
2006-08-14 6:20 ` [take8 2/2] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-14 6:21 ` [take9 0/2] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-08-14 6:21 ` [take9 1/2] kevent: Core files Evgeniy Polyakov
2006-08-14 6:21 ` [take9 2/2] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-16 13:30 ` Christoph Hellwig
2006-08-16 13:40 ` Evgeniy Polyakov
2006-08-18 10:41 ` Christoph Hellwig
2006-08-18 10:59 ` Evgeniy Polyakov
2006-08-21 11:01 ` Christoph Hellwig
2006-08-21 11:26 ` Evgeniy Polyakov
2006-08-22 14:35 ` Davide Libenzi
2006-08-16 13:45 ` [take9 1/2] kevent: Core files Christoph Hellwig
2006-08-16 13:56 ` Evgeniy Polyakov
2006-08-16 18:08 ` Zach Brown
2006-08-16 19:24 ` Evgeniy Polyakov
2006-08-16 19:45 ` David Miller
2006-08-16 20:06 ` Evgeniy Polyakov
2006-08-18 10:46 ` Christoph Hellwig
2006-08-18 11:23 ` Evgeniy Polyakov
2006-08-21 10:56 ` Christoph Hellwig
2006-08-21 11:13 ` Evgeniy Polyakov
2006-08-21 12:53 ` Bernd Petrovitsch
2006-08-21 13:01 ` Evgeniy Polyakov
2006-08-21 13:49 ` Bernd Petrovitsch
2006-08-21 19:09 ` David Miller
2006-08-16 13:26 ` [take9 0/2] kevent: Generic event handling mechanism Christoph Hellwig
2006-08-16 13:38 ` Evgeniy Polyakov
2006-08-16 18:10 ` Zach Brown
2006-08-16 12:34 ` [take10 " Evgeniy Polyakov
2006-08-16 12:34 ` [take10 1/2] kevent: Core files Evgeniy Polyakov
2006-08-16 12:34 ` [take10 2/2] kevent: poll/select() notifications. Timer notifications Evgeniy Polyakov
2006-08-18 9:35 ` [take10 1/2] kevent: Core files Joe Jin
2006-08-18 10:10 ` Evgeniy Polyakov
2006-08-01 1:05 ` [RFC 1/4] kevent: core files David Miller
2006-07-27 20:58 ` Benjamin LaHaise
2006-07-27 21:44 ` Zach Brown
2006-07-27 22:02 ` Benjamin LaHaise
2006-07-28 5:39 ` Evgeniy Polyakov
2006-07-28 19:01 ` Zach Brown
2006-07-28 19:24 ` Evgeniy Polyakov
2006-07-28 19:34 ` Zach Brown
2006-07-28 19:37 ` Zach Brown
2006-08-01 1:02 ` David Miller
2006-08-01 17:02 ` Zach Brown
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