From: Benjamin LaHaise <bcrl@redhat.com>
To: Andrew Morton <akpm@zip.com.au>
Cc: Andrea Arcangeli <andrea@suse.de>,
Linus Torvalds <torvalds@transmeta.com>,
"Martin J. Bligh" <fletch@aracnet.com>,
Rik van Riel <riel@conectiva.com.br>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: scalable kmap (was Re: vm lock contention reduction)
Date: Mon, 8 Jul 2002 17:08:41 -0400 [thread overview]
Message-ID: <20020708170841.Q13063@redhat.com> (raw)
In-Reply-To: <3D29F868.1338ACF3@zip.com.au>; from akpm@zip.com.au on Mon, Jul 08, 2002 at 01:39:04PM -0700
On Mon, Jul 08, 2002 at 01:39:04PM -0700, Andrew Morton wrote:
> I think I'll just go for pinning the damn page. It's a spinlock and
> maybe three cachelines but the kernel is about to do a 4k memcpy
> anyway. And get_user_pages() doesn't show up much on O_DIRECT
> profiles and it'll be a net win and we need to do SOMETHING, dammit.
Pinning the page costs too much (remember, it's only a win with a
reduced copy of more that 512 bytes). The right way of doing it is
letting copy_*_user fail on a page fault for places like this where
we need to drop locks before going into the page fault handler.
-ben
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next prev parent reply other threads:[~2002-07-08 21:08 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-04 23:05 vm lock contention reduction Andrew Morton
2002-07-04 23:26 ` Rik van Riel
2002-07-04 23:27 ` Rik van Riel
2002-07-05 1:37 ` Andrew Morton
2002-07-05 1:49 ` Rik van Riel
2002-07-05 2:18 ` Andrew Morton
2002-07-05 2:16 ` Rik van Riel
2002-07-05 2:53 ` Andrew Morton
2002-07-05 3:52 ` Benjamin LaHaise
2002-07-05 4:47 ` Linus Torvalds
2002-07-05 5:38 ` Andrew Morton
2002-07-05 5:51 ` Linus Torvalds
2002-07-05 6:08 ` Linus Torvalds
2002-07-05 6:27 ` Alexander Viro
2002-07-05 6:33 ` Andrew Morton
2002-07-05 7:33 ` Andrea Arcangeli
2002-07-07 2:50 ` Andrew Morton
2002-07-07 3:05 ` Linus Torvalds
2002-07-07 3:47 ` Andrew Morton
2002-07-08 11:39 ` Enhanced profiling support (was Re: vm lock contention reduction) John Levon
2002-07-08 11:39 ` John Levon
2002-07-08 17:52 ` Linus Torvalds
2002-07-08 17:52 ` Linus Torvalds
2002-07-08 18:41 ` Karim Yaghmour
2002-07-08 18:41 ` Karim Yaghmour
2002-07-10 2:22 ` John Levon
2002-07-10 2:22 ` John Levon
2002-07-10 4:16 ` Karim Yaghmour
2002-07-10 4:16 ` Karim Yaghmour
2002-07-10 4:38 ` John Levon
2002-07-10 4:38 ` John Levon
2002-07-10 5:46 ` Karim Yaghmour
2002-07-10 5:46 ` Karim Yaghmour
2002-07-10 13:10 ` bob
2002-07-10 13:10 ` bob
2002-07-09 16:57 ` John Levon
2002-07-09 19:56 ` Karim Yaghmour
2002-07-07 5:16 ` vm lock contention reduction Martin J. Bligh
2002-07-07 6:13 ` scalable kmap (was Re: vm lock contention reduction) Martin J. Bligh
2002-07-07 6:37 ` Andrew Morton
2002-07-07 7:53 ` Linus Torvalds
2002-07-07 9:04 ` Andrew Morton
2002-07-07 16:13 ` Martin J. Bligh
2002-07-07 18:31 ` Linus Torvalds
2002-07-07 18:55 ` Linus Torvalds
2002-07-07 19:02 ` Linus Torvalds
2002-07-08 7:24 ` Andrew Morton
2002-07-08 8:09 ` Andrea Arcangeli
2002-07-08 14:50 ` William Lee Irwin III
2002-07-08 20:39 ` Andrew Morton
2002-07-08 21:08 ` Benjamin LaHaise [this message]
2002-07-08 21:45 ` Andrew Morton
2002-07-08 22:24 ` Benjamin LaHaise
2002-07-07 16:00 ` Martin J. Bligh
2002-07-07 18:28 ` Linus Torvalds
2002-07-08 7:11 ` Andrea Arcangeli
2002-07-08 10:15 ` Eric W. Biederman
2002-07-08 7:00 ` Andrea Arcangeli
2002-07-08 17:29 ` Martin J. Bligh
2002-07-08 22:14 ` Linus Torvalds
2002-07-09 0:16 ` Andrew Morton
2002-07-09 3:17 ` Andrew Morton
2002-07-09 4:28 ` Martin J. Bligh
2002-07-09 5:28 ` Andrew Morton
2002-07-09 6:15 ` Martin J. Bligh
2002-07-09 6:30 ` William Lee Irwin III
2002-07-09 6:32 ` William Lee Irwin III
2002-07-09 16:08 ` Martin J. Bligh
2002-07-09 17:32 ` Andrea Arcangeli
2002-07-10 5:32 ` Andrew Morton
2002-07-10 22:43 ` Martin J. Bligh
2002-07-10 23:08 ` Andrew Morton
2002-07-10 23:26 ` Martin J. Bligh
2002-07-11 0:19 ` Andrew Morton
2002-07-12 17:48 ` Martin J. Bligh
2002-07-13 11:18 ` Andrea Arcangeli
2002-07-09 13:59 ` Benjamin LaHaise
2002-07-08 0:38 ` vm lock contention reduction William Lee Irwin III
2002-07-05 6:46 ` Andrew Morton
2002-07-05 14:25 ` Rik van Riel
2002-07-05 23:11 ` William Lee Irwin III
2002-07-05 23:48 ` Andrew Morton
2002-07-06 0:11 ` Rik van Riel
2002-07-06 0:31 ` Linus Torvalds
2002-07-06 0:45 ` Rik van Riel
2002-07-06 0:48 ` Andrew Morton
2002-07-08 0:59 ` William Lee Irwin III
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