From: Timur Tabi <timur.tabi@ammasso.com>
To: Roland Dreier <roland@topspin.com>
Cc: Andrew Morton <akpm@osdl.org>,
libor@topspin.com, hch@infradead.org,
linux-kernel@vger.kernel.org, openib-general@openib.org
Subject: Re: [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
Date: Tue, 26 Apr 2005 15:18:40 -0500 [thread overview]
Message-ID: <426EA220.6010007@ammasso.com> (raw)
In-Reply-To: <5264y9s3bs.fsf@topspin.com>
Roland Dreier wrote:
> Yes, I agree. If an app wants to register half a page and pass the
> other half to a child process, I think the only answer is "don't do
> that then."
How can the app know that, though? It would have to allocate I/O buffers with knowledge
of page boundaries. Today, the apps just malloc() a bunch of memory and pay no attention
to whether the beginning or the end of the buffer shares a page with some other, unrelated
object. We may as well tell the app that it needs to page-align all I/O buffers.
My point is that we can't just simply say, "Don't do that". Some entity (the kernel,
libraries, whatever) should be able to tell the app that its usage of memory is going to
break in some unpredictable way.
--
Timur Tabi
Staff Software Engineer
timur.tabi@ammasso.com
One thing a Southern boy will never say is,
"I don't think duct tape will fix it."
-- Ed Smylie, NASA engineer for Apollo 13
next prev parent reply other threads:[~2005-04-26 20:21 UTC|newest]
Thread overview: 144+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-04 22:09 [PATCH][RFC][0/4] InfiniBand userspace verbs implementation Roland Dreier
2005-04-04 22:09 ` [PATCH][RFC][1/4] IB: core changes for userspace verbs Roland Dreier
2005-04-04 22:09 ` [PATCH][RFC][2/4] IB: userspace verbs main module Roland Dreier
2005-04-04 22:09 ` [PATCH][RFC][3/4] IB: userspace verbs mthca changes Roland Dreier
2005-04-04 22:09 ` [PATCH][RFC][4/4] IB: userspace verbs Kconfig/Makefile changes Roland Dreier
2005-04-04 22:49 ` [openib-general] [PATCH][RFC][3/4] IB: userspace verbs mthca changes Tom Duffy
2005-04-04 23:34 ` Roland Dreier
2005-04-21 0:37 ` [PATCH][MTHCA] fix sparc build WAS: " Tom Duffy
2005-04-21 0:38 ` David S. Miller
2005-04-11 14:22 ` [PATCH][RFC][0/4] InfiniBand userspace verbs implementation Troy Benjegerdes
2005-04-11 15:34 ` Roland Dreier
2005-04-11 16:33 ` Troy Benjegerdes
2005-04-11 16:56 ` Roland Dreier
2005-04-11 18:01 ` Troy Benjegerdes
2005-04-11 18:03 ` Roland Dreier
2005-04-12 0:13 ` Andrew Morton
2005-04-12 0:21 ` Roland Dreier
2005-04-12 18:23 ` Michael S. Tsirkin
2005-04-13 18:28 ` Roland Dreier
2005-04-13 19:32 ` Andrew Morton
2005-04-13 1:04 ` [openib-general] " Libor Michalek
2005-04-18 17:15 ` Timur Tabi
2005-04-26 3:31 ` Libor Michalek
2005-05-04 18:27 ` Timur Tabi
2005-05-05 18:48 ` Timur Tabi
2005-05-06 23:08 ` Timur Tabi
2005-05-07 13:18 ` Hugh Dickins
2005-05-07 14:45 ` Timur Tabi
2005-05-07 16:30 ` Hugh Dickins
2005-05-11 20:12 ` William Jordan
2005-05-11 20:42 ` Hugh Dickins
2005-05-11 22:52 ` Andrea Arcangeli
2005-05-11 22:49 ` Andrea Arcangeli
2005-05-11 22:53 ` Timur Tabi
2005-05-11 23:05 ` Andrea Arcangeli
2005-05-05 23:34 ` Libor Michalek
2005-04-18 16:22 ` Timur Tabi
2005-04-18 16:43 ` Christoph Hellwig
2005-04-18 16:45 ` Timur Tabi
2005-04-24 2:44 ` Andrew Morton
2005-04-24 14:23 ` Timur Tabi
2005-04-24 20:53 ` Greg KH
2005-04-24 21:52 ` Timur Tabi
2005-04-25 1:03 ` Greg KH
2005-04-25 4:12 ` Timur Tabi
2005-04-25 13:30 ` Dave Hansen
2005-04-25 13:15 ` Roland Dreier
2005-04-25 13:17 ` Christoph Hellwig
2005-04-25 14:16 ` Roland Dreier
2005-04-25 20:54 ` Andrew Morton
2005-04-25 21:12 ` Roland Dreier
2005-04-25 22:14 ` Andrew Morton
2005-04-25 22:21 ` Timur Tabi
2005-04-25 22:32 ` Andrew Morton
2005-04-25 23:58 ` Roland Dreier
2005-04-26 0:11 ` Andrew Morton
2005-04-26 0:23 ` Roland Dreier
2005-04-26 0:37 ` Andrew Morton
2005-04-26 2:21 ` Timur Tabi
2005-04-26 3:16 ` Andrew Morton
2005-04-26 3:38 ` Timur Tabi
2005-04-26 4:33 ` Andrew Morton
2005-04-26 14:07 ` Timur Tabi
2005-04-26 15:31 ` Roland Dreier
2005-04-26 15:42 ` [openib-general] " Libor Michalek
2005-04-26 15:49 ` Roland Dreier
2005-04-26 19:28 ` Andrew Morton
2005-04-26 20:14 ` Roland Dreier
2005-04-26 20:18 ` Timur Tabi [this message]
2005-04-26 20:37 ` Andrew Morton
2005-04-29 14:26 ` Bill Jordan
2005-04-29 15:56 ` Caitlin Bestler
2005-04-29 16:45 ` RDMA memory registration (was: [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation) Roland Dreier
2005-04-29 17:23 ` Libor Michalek
2005-04-29 18:22 ` RDMA memory registration Brice Goglin
2005-04-29 18:31 ` Roland Dreier
2005-04-29 19:33 ` [openib-general] " Grant Grundler
2005-05-03 8:42 ` David Addison
2005-05-03 15:36 ` Grant Grundler
2005-04-29 19:43 ` RDMA memory registration (was: [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation) Bill Jordan
2005-04-29 19:45 ` RDMA memory registration Roland Dreier
2005-04-29 17:04 ` [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation Libor Michalek
2005-04-30 0:31 ` Caitlin Bestler
2005-05-03 18:43 ` Andy Isaacson
2005-05-03 19:04 ` Caitlin Bestler
2005-05-04 18:22 ` William Jordan
2005-05-05 1:27 ` Rik van Riel
2005-05-05 1:57 ` Andy Isaacson
2005-04-26 20:32 ` Andrew Morton
2005-04-26 21:23 ` Roland Dreier
2005-04-27 0:05 ` Andrew Morton
2005-04-27 2:13 ` Roland Dreier
2005-04-27 3:21 ` Caitlin Bestler
2005-04-27 3:15 ` Caitlin Bestler
2005-04-26 2:03 ` IWAMOTO Toshihiro
2005-04-26 2:16 ` Timur Tabi
2005-04-26 2:26 ` [openib-general] " Stephen Langdon
2005-04-25 22:23 ` Timur Tabi
2005-04-25 22:35 ` Andrew Morton
2005-04-25 22:42 ` Timur Tabi
2005-04-25 23:13 ` Andrew Morton
2005-04-25 23:21 ` Timur Tabi
2005-04-25 23:27 ` Andrew Morton
2005-04-26 0:08 ` Roland Dreier
2005-04-25 22:51 ` [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbsimplementation Bob Woodruff
2005-04-25 23:13 ` Timur Tabi
2005-04-25 23:17 ` Andrew Morton
2005-04-25 23:29 ` Bob Woodruff
2005-04-25 23:17 ` [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation Libor Michalek
2005-04-25 23:24 ` Andrew Morton
2005-04-25 23:37 ` Caitlin Bestler
2005-04-26 0:10 ` Andrew Morton
2005-04-26 3:55 ` Libor Michalek
2005-04-26 0:02 ` Roland Dreier
2005-04-26 6:12 ` Christoph Hellwig
2005-04-26 13:45 ` [openib-general] " Caitlin Bestler
2005-04-26 15:24 ` Timur Tabi
2005-04-25 19:11 ` Andy Isaacson
2005-04-18 16:09 ` Timur Tabi
2005-04-18 16:12 ` Roland Dreier
2005-04-18 16:50 ` Timur Tabi
2005-04-21 19:47 ` Pavel Machek
2005-04-18 16:16 ` Arjan van de Ven
2005-04-18 16:25 ` Timur Tabi
2005-04-18 19:40 ` Arjan van de Ven
2005-04-18 20:00 ` Timur Tabi
2005-04-18 20:05 ` Arjan van de Ven
2005-04-18 20:19 ` Timur Tabi
2005-04-18 20:07 ` [openib-general] " Bernhard Fischer
2005-04-21 2:17 ` Troy Benjegerdes
2005-04-21 3:07 ` Timur Tabi
2005-04-21 17:38 ` Andy Isaacson
2005-04-21 18:39 ` Timur Tabi
2005-04-21 19:56 ` Andy Isaacson
2005-04-21 20:07 ` Timur Tabi
2005-04-21 20:12 ` Chris Wright
2005-04-21 20:14 ` Timur Tabi
2005-04-21 20:25 ` Chris Wright
2005-04-21 20:30 ` Arjan van de Ven
2005-04-22 6:14 ` Greg KH
2005-04-22 17:55 ` Timur Tabi
2005-04-22 18:12 ` Arjan van de Ven
2005-04-29 0:56 ` Andrew Morton
[not found] <3VAeQ-1To-7@gated-at.bofh.it>
[not found] ` <3VNYt-4M4-15@gated-at.bofh.it>
2005-04-22 13:10 ` [openib-general] " Bodo Eggert <harvested.in.lkml@posting.7eggert.dyndns.org>
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