From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Kyle Moffett <mrmacman_g4@mac.com>, Paul Jackson <pj@sgi.com>,
andy@thermo.lanl.gov, mbligh@mbligh.org, akpm@osdl.org,
arjan@infradead.org, arjanv@infradead.org, haveblue@us.ibm.com,
kravetz@us.ibm.com, lhms-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org, linux-mm@kvack.org, mel@csn.ul.ie,
nickpiggin@yahoo.com.au
Subject: Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19
Date: Mon, 7 Nov 2005 09:00:42 +0100 [thread overview]
Message-ID: <20051107080042.GA29961@elte.hu> (raw)
In-Reply-To: <Pine.LNX.4.64.0511060848010.3316@g5.osdl.org>
* Linus Torvalds <torvalds@osdl.org> wrote:
> > You could do it today, although at a pretty high cost. And you'd have to
> > forget about supporting any hardware that really wants contiguous memory
> > for DMA (sound cards etc). It just isn't worth it.
>
> Btw, in case it wasn't clear: the cost of these kinds of things in the
> kernel is usually not so much the actual "lookup" (whether with hw
> assist or with another field in the "struct page").
[...]
> So remappable kernels are certainly doable, they just have more
> fundamental problems than remappable user space _ever_ has. Both from
> a performance and from a complexity angle.
furthermore, it doesnt bring us any closer to removable RAM. The problem
is still unsolvable (due to the 'how to do you find live pointers to fix
up' issue), even if the full kernel VM is 'mapped' at 4K granularity.
Ingo
next prev parent reply other threads:[~2005-11-07 8:01 UTC|newest]
Thread overview: 216+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-04 1:00 Andy Nelson
2005-11-04 1:16 ` Martin J. Bligh
2005-11-04 1:27 ` Nick Piggin
2005-11-04 5:14 ` Linus Torvalds
2005-11-04 6:10 ` Paul Jackson
2005-11-04 6:38 ` Ingo Molnar
2005-11-04 7:26 ` Paul Jackson
2005-11-04 7:37 ` Ingo Molnar
2005-11-04 15:31 ` Linus Torvalds
2005-11-04 15:39 ` Martin J. Bligh
2005-11-04 15:53 ` Ingo Molnar
2005-11-06 7:34 ` Paul Jackson
2005-11-06 15:55 ` Linus Torvalds
2005-11-06 18:18 ` Paul Jackson
2005-11-06 8:44 ` Kyle Moffett
2005-11-06 16:12 ` Linus Torvalds
2005-11-06 17:00 ` Linus Torvalds
2005-11-07 1:28 ` Best CPU chipset for Linux? (was: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19) John Stoffel
2005-11-07 2:08 ` Linus Torvalds
2005-11-07 3:19 ` John Stoffel
2005-11-07 8:00 ` Ingo Molnar [this message]
2005-11-07 11:00 ` [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19 Dave Hansen
2005-11-07 12:20 ` Ingo Molnar
2005-11-07 19:34 ` Steven Rostedt
2005-11-07 23:38 ` Joel Schopp
2005-11-13 2:30 ` Rob Landley
2005-11-14 1:58 ` Joel Schopp
2005-11-04 7:44 ` Eric Dumazet
2005-11-07 16:42 ` Adam Litke
2005-11-04 14:56 ` Andy Nelson
2005-11-04 15:18 ` Ingo Molnar
2005-11-04 15:39 ` Andy Nelson
2005-11-04 16:05 ` Ingo Molnar
2005-11-04 16:07 ` Linus Torvalds
2005-11-04 16:40 ` Ingo Molnar
2005-11-04 17:22 ` Linus Torvalds
2005-11-04 17:43 ` Andy Nelson
2005-11-04 16:00 ` Linus Torvalds
2005-11-04 16:13 ` Martin J. Bligh
2005-11-04 16:40 ` Linus Torvalds
2005-11-04 17:10 ` Martin J. Bligh
2005-11-04 16:14 ` Andy Nelson
2005-11-04 16:49 ` Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2005-11-05 1:52 Seth, Rohit
2005-11-05 1:37 Seth, Rohit
2005-11-07 0:34 ` Andy Nelson
2005-11-07 18:58 ` Adam Litke
2005-11-07 20:51 ` Rohit Seth
2005-11-07 20:55 ` Andy Nelson
2005-11-07 20:58 ` Martin J. Bligh
2005-11-07 21:20 ` Rohit Seth
2005-11-07 21:33 ` Adam Litke
2005-11-08 2:12 ` David Gibson
2005-11-07 21:11 ` Adam Litke
2005-11-07 21:31 ` Rohit Seth
2005-11-04 21:51 Andy Nelson
2005-11-04 17:56 Andy Nelson
2005-11-04 17:03 Andy Nelson
2005-11-04 17:49 ` Linus Torvalds
2005-11-04 17:51 ` Andy Nelson
2005-11-04 20:12 ` Ingo Molnar
2005-11-04 21:04 ` Andy Nelson
2005-11-04 21:14 ` Ingo Molnar
2005-11-04 21:22 ` Linus Torvalds
2005-11-04 21:39 ` Linus Torvalds
2005-11-05 2:48 ` Rob Landley
2005-11-06 10:59 ` Paul Jackson
2005-11-04 21:31 ` Gregory Maxwell
2005-11-04 22:43 ` Andi Kleen
2005-11-05 0:07 ` Nick Piggin
2005-11-06 1:30 ` Zan Lynx
2005-11-06 2:25 ` Rob Landley
2005-11-04 15:19 Andy Nelson
2005-10-30 18:33 Mel Gorman
2005-10-31 5:57 ` [Lhms-devel] " Mike Kravetz
2005-10-31 6:37 ` Nick Piggin
2005-10-31 7:54 ` Andrew Morton
2005-10-31 7:11 ` Nick Piggin
2005-10-31 16:19 ` Mel Gorman
2005-10-31 23:54 ` Nick Piggin
2005-11-01 1:28 ` Mel Gorman
2005-11-01 1:42 ` Nick Piggin
[not found] ` <27700000.1130769270@[10.10.2.4]>
[not found] ` <20051031112409.153e7048.akpm@osdl.org>
[not found] ` <3660000.1130787652@flay>
2005-10-31 23:59 ` Nick Piggin
2005-11-01 1:36 ` Mel Gorman
[not found] ` <4366A8D1.7020507@yahoo.com.au>
[not found] ` <Pine.LNX.4.58.0510312333240.29390@skynet>
[not found] ` <4366C559.5090504@yahoo.com.au>
2005-11-01 15:25 ` Martin J. Bligh
2005-11-01 15:33 ` Dave Hansen
2005-11-01 16:57 ` Mel Gorman
2005-11-01 17:00 ` Mel Gorman
2005-11-01 18:58 ` Rob Landley
[not found] ` <Pine.LNX.4.58.0511010137020.29390@skynet>
[not found] ` <4366D469.2010202@yahoo.com.au>
[not found] ` <Pine.LNX.4.58.0511011014060.14884@skynet>
2005-11-01 13:56 ` Ingo Molnar
2005-11-01 14:10 ` Dave Hansen
2005-11-01 14:29 ` Ingo Molnar
2005-11-01 14:49 ` Dave Hansen
2005-11-01 15:01 ` Ingo Molnar
2005-11-01 15:22 ` Dave Hansen
[not found] ` <20051102084946.GA3930@elte.hu>
[not found] ` <436880B8.1050207@yahoo.com.au>
2005-11-02 9:32 ` Dave Hansen
2005-11-02 9:48 ` Nick Piggin
2005-11-02 10:54 ` Dave Hansen
2005-11-02 15:02 ` Martin J. Bligh
2005-11-03 3:21 ` Nick Piggin
2005-11-03 15:36 ` Martin J. Bligh
2005-11-03 15:40 ` Arjan van de Ven
2005-11-03 15:51 ` Linus Torvalds
2005-11-03 15:57 ` Martin J. Bligh
2005-11-03 16:20 ` Arjan van de Ven
2005-11-03 16:27 ` Mel Gorman
2005-11-03 16:46 ` Linus Torvalds
2005-11-03 16:52 ` Martin J. Bligh
2005-11-03 17:19 ` Linus Torvalds
2005-11-03 17:48 ` Dave Hansen
2005-11-03 17:51 ` Martin J. Bligh
2005-11-03 17:59 ` Arjan van de Ven
2005-11-03 18:08 ` Linus Torvalds
2005-11-03 18:17 ` Martin J. Bligh
2005-11-03 18:44 ` Linus Torvalds
2005-11-03 18:51 ` Martin J. Bligh
2005-11-03 19:35 ` Linus Torvalds
2005-11-03 22:40 ` Martin J. Bligh
2005-11-03 22:56 ` Linus Torvalds
2005-11-03 23:01 ` Martin J. Bligh
2005-11-04 0:58 ` Nick Piggin
2005-11-04 1:06 ` Linus Torvalds
2005-11-04 1:20 ` Paul Mackerras
2005-11-04 1:22 ` Nick Piggin
2005-11-04 1:48 ` Mel Gorman
2005-11-04 1:59 ` Nick Piggin
2005-11-04 2:35 ` Mel Gorman
2005-11-04 1:26 ` Mel Gorman
2005-11-03 21:11 ` Mel Gorman
2005-11-03 18:03 ` Linus Torvalds
2005-11-03 20:00 ` Paul Jackson
2005-11-03 20:46 ` Mel Gorman
2005-11-03 18:48 ` Martin J. Bligh
2005-11-03 19:08 ` Linus Torvalds
2005-11-03 22:37 ` Martin J. Bligh
2005-11-03 23:16 ` Linus Torvalds
2005-11-03 23:39 ` Martin J. Bligh
2005-11-04 0:42 ` Nick Piggin
2005-11-04 4:39 ` Andrew Morton
2005-11-04 16:22 ` Mel Gorman
2005-11-03 15:53 ` Martin J. Bligh
2005-11-01 16:48 ` Kamezawa Hiroyuki
2005-11-01 16:59 ` Kamezawa Hiroyuki
2005-11-01 17:19 ` Mel Gorman
2005-11-02 0:32 ` KAMEZAWA Hiroyuki
2005-11-02 11:22 ` Mel Gorman
2005-11-01 18:06 ` linux-os (Dick Johnson)
2005-11-02 7:19 ` Ingo Molnar
2005-11-02 7:46 ` Gerrit Huizenga
2005-11-02 8:50 ` Nick Piggin
2005-11-02 9:12 ` Gerrit Huizenga
2005-11-02 9:37 ` Nick Piggin
2005-11-02 10:17 ` Gerrit Huizenga
2005-11-02 23:47 ` Rob Landley
2005-11-03 4:43 ` Nick Piggin
2005-11-03 6:07 ` Rob Landley
2005-11-03 7:34 ` Nick Piggin
2005-11-03 17:54 ` Rob Landley
2005-11-03 20:13 ` Jeff Dike
2005-11-03 16:35 ` Jeff Dike
2005-11-03 16:23 ` Badari Pulavarty
2005-11-03 18:27 ` Jeff Dike
2005-11-03 18:49 ` Rob Landley
2005-11-04 4:52 ` Andrew Morton
2005-11-04 5:35 ` Paul Jackson
2005-11-04 5:48 ` Andrew Morton
2005-11-04 6:42 ` Paul Jackson
2005-11-04 7:10 ` Andrew Morton
2005-11-04 7:45 ` Paul Jackson
2005-11-04 8:02 ` Andrew Morton
2005-11-04 9:52 ` Paul Jackson
2005-11-04 15:27 ` Martin J. Bligh
2005-11-04 15:19 ` Martin J. Bligh
2005-11-04 17:38 ` Andrew Morton
2005-11-04 6:16 ` Bron Nelson
2005-11-02 10:41 ` Ingo Molnar
2005-11-02 11:04 ` Gerrit Huizenga
2005-11-02 12:00 ` Ingo Molnar
2005-11-02 12:42 ` Dave Hansen
2005-11-02 15:02 ` Gerrit Huizenga
2005-11-03 0:10 ` Rob Landley
2005-11-02 7:57 ` Nick Piggin
2005-11-02 0:51 ` Nick Piggin
2005-11-02 7:42 ` Dave Hansen
2005-11-02 8:24 ` Nick Piggin
2005-11-02 8:33 ` Yasunori Goto
2005-11-02 8:43 ` Nick Piggin
2005-11-02 14:51 ` Martin J. Bligh
2005-11-02 23:28 ` Rob Landley
2005-11-03 5:26 ` Jeff Dike
2005-11-03 5:41 ` Rob Landley
2005-11-01 14:41 ` Mel Gorman
2005-11-01 14:46 ` Ingo Molnar
2005-11-01 15:23 ` Mel Gorman
2005-11-01 18:33 ` Rob Landley
2005-11-01 19:02 ` Ingo Molnar
2005-11-01 14:50 ` Dave Hansen
2005-11-01 15:24 ` Mel Gorman
2005-11-02 5:11 ` Andrew Morton
2005-11-01 18:23 ` Rob Landley
2005-11-01 20:31 ` Joel Schopp
2005-11-01 20:59 ` Joel Schopp
2005-11-02 1:06 ` Nick Piggin
2005-11-02 1:41 ` Martin J. Bligh
2005-11-02 2:03 ` Nick Piggin
2005-11-02 2:24 ` Martin J. Bligh
2005-11-02 2:49 ` Nick Piggin
2005-11-02 4:39 ` Martin J. Bligh
2005-11-02 5:09 ` Nick Piggin
2005-11-02 5:14 ` Martin J. Bligh
2005-11-02 6:23 ` KAMEZAWA Hiroyuki
2005-11-02 10:15 ` Nick Piggin
2005-11-02 7:19 ` Yasunori Goto
2005-11-02 11:48 ` Mel Gorman
2005-11-02 11:41 ` Mel Gorman
2005-11-02 11:37 ` Mel Gorman
2005-11-02 15:11 ` Mel Gorman
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