From: Thomas Sailer <sailer@ife.ee.ethz.ch> To: Gerard Roudier <groudier@club-internet.fr>, linux-kernel@vger.rutgers.edu, linux-mm@kvack.org Subject: Re: MM deadlock [was: Re: arca-vm-8...] Date: Tue, 26 Jan 1999 12:45:08 +0100 [thread overview] Message-ID: <36ADAAC4.82165F6E@ife.ee.ethz.ch> (raw) In-Reply-To: Pine.LNX.3.95.990125222327.726A-100000@localhost Gerard Roudier wrote: > If you tell me that some system XXX is able to quickly free Mega-Bytes of > physical contiguous memory at any time when it is asked for such a Noone said it has to happen quickly, it's entirely useful even if the calling process (and possibly others) will sleep for 10secs. These allocations are very uncommon, but nevertheless sometimes necessary for some device (drivers). > brain-deaded allocation, then for sure, I will never use system XXX, > because this magic behaviour seems not to be possible without some > paranoid VM policy that may affect badly performances for normal stuff. You may well call the devices that need this broken, the problem is that they are in rather widespread use. If we don't find an algorithm that doesn't affect preformance for the normal stuff, (why would something like selecting a memory region and forcing everything that's currently in the way to be swapped out not work?), then we should probably have a special pool for these "perverse" mappings. But I think there's a rather generic problem: how are you going to support 32bit PCI busmasters in machines with more than 4Gig main memory? It's conceptually the same as how are you going to support ISA DMA with more than 16Meg main memory. 32bit only PCI busmasters are very common these days, I don't know a single PCI soundcard that can do 64bit master (or even slave) cycles. Also, all PCI soundcards I know which have a hardware wavetable synth (without sample ROM) require ridiculously large contiguous allocations (>= 1M) for the synth to work. > Anything that requires more that 1 PAGE of physical memory at a time on > running systems is a very bad thing in my opinion. The PAGE is the only Ok, then remove any soundcard from your system. That might be acceptable for you, but probably not for 90% of the Linux users. Tom -- To unsubscribe, send a message with 'unsubscribe linux-mm my@address' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://humbolt.geo.uu.nl/Linux-MM/
next prev parent reply other threads:[~1999-01-26 11:45 UTC|newest]
Thread overview: 243+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <199812290146.BAA12687@terrorserver.swansea.linux.org.uk>
1998-12-31 18:00 ` 2.2.0 Bug summary Andrea Arcangeli
1998-12-31 18:34 ` [patch] new-vm improvement [Re: 2.2.0 Bug summary] Andrea Arcangeli
1999-01-01 0:16 ` Steve Bergman
1999-01-01 17:16 ` Andrea Arcangeli
1999-01-01 16:44 ` Andrea Arcangeli
1999-01-01 20:02 ` Andrea Arcangeli
1999-01-01 23:46 ` Steve Bergman
1999-01-02 6:55 ` Linus Torvalds
1999-01-02 8:33 ` Steve Bergman
1999-01-02 14:48 ` Andrea Arcangeli
1999-01-02 15:38 ` Andrea Arcangeli
1999-01-02 18:10 ` Linus Torvalds
1999-01-02 20:52 ` Andrea Arcangeli
1999-01-03 2:59 ` Andrea Arcangeli
1999-01-04 18:08 ` [patch] arca-vm-6, killed kswapd [Re: [patch] new-vm improvement , [Re: 2.2.0 Bug summary]] Andrea Arcangeli
1999-01-04 20:56 ` Linus Torvalds
1999-01-04 21:10 ` Rik van Riel
1999-01-04 22:04 ` Alan Cox
1999-01-04 21:55 ` Linus Torvalds
1999-01-04 22:51 ` Andrea Arcangeli
1999-01-05 0:32 ` Andrea Arcangeli
1999-01-05 0:52 ` Zlatko Calusic
1999-01-05 3:02 ` Zlatko Calusic
1999-01-05 11:49 ` Andrea Arcangeli
1999-01-05 13:23 ` Zlatko Calusic
1999-01-05 15:42 ` Andrea Arcangeli
1999-01-05 16:16 ` Zlatko Calusic
1999-01-05 15:35 ` arca-vm-8 [Re: [patch] arca-vm-6, killed kswapd [Re: [patch] new-vm , improvement , [Re: 2.2.0 Bug summary]]] Andrea Arcangeli
1999-01-06 14:48 ` Andrea Arcangeli
1999-01-06 23:31 ` Andrea Arcangeli
1999-01-07 3:32 ` Results: 2.2.0-pre5 vs arcavm10 vs arcavm9 vs arcavm7 Steve Bergman
1999-01-07 12:02 ` Andrea Arcangeli
1999-01-07 20:27 ` Linus Torvalds
1999-01-07 23:56 ` Andrea Arcangeli
1999-01-07 17:35 ` Linus Torvalds
1999-01-07 18:44 ` Zlatko Calusic
1999-01-07 19:33 ` Linus Torvalds
1999-01-07 21:10 ` Zlatko Calusic
1999-01-07 19:38 ` Zlatko Calusic
1999-01-07 19:40 ` Andrea Arcangeli
1999-01-09 6:28 ` 2.2.0-pre[56] swap performance poor with > 1 thrashing task Dax Kelson
1999-01-09 6:32 ` Zlatko Calusic
1999-01-09 6:44 ` Linus Torvalds
1999-01-09 18:58 ` Andrea Arcangeli
1999-01-11 9:21 ` Buffer handling (setting PG_referenced on access) Zlatko Calusic
1999-01-11 17:44 ` Linus Torvalds
1999-01-11 20:14 ` Zlatko Calusic
1999-01-16 17:35 ` 2.2.0-pre[56] swap performance poor with > 1 thrashing task Andrea Arcangeli
1999-01-09 7:48 ` Benjamin Redelings I
1999-01-09 6:53 ` Linus Torvalds
1999-01-09 22:39 ` Results: pre6 vs pre6+zlatko's_patch vs pre5 vs arcavm13 Steve Bergman
1999-01-10 0:28 ` Steve Bergman
1999-01-10 5:35 ` Linus Torvalds
1999-01-10 18:33 ` Andrea Arcangeli
1999-01-10 18:43 ` Steve Bergman
1999-01-10 19:08 ` Linus Torvalds
1999-01-10 19:23 ` Vladimir Dergachev
1999-01-10 20:09 ` Andrea Arcangeli
1999-01-10 20:29 ` Steve Bergman
1999-01-10 21:41 ` Linus Torvalds
1999-01-10 23:33 ` testing/pre-7 and do_poll() Chip Salzenberg
1999-01-11 6:02 ` Linus Torvalds
1999-01-11 6:26 ` Chip Salzenberg
1999-01-11 6:46 ` Linus Torvalds
1999-01-11 6:59 ` Chip Salzenberg
1999-01-11 7:02 ` Linus Torvalds
1999-01-11 22:08 ` Shawn Leas
1999-01-11 22:13 ` Linus Torvalds
1999-01-12 0:25 ` estafford
1999-01-12 8:25 ` Shawn Leas
1999-01-12 7:06 ` Gregory Maxwell
1999-01-11 20:20 ` Adam Heath
1999-01-11 16:57 ` Results: pre6 vs pre6+zlatko's_patch vs pre5 vs arcavm13 Steve Bergman
1999-01-11 19:36 ` Andrea Arcangeli
1999-01-11 23:03 ` Andrea Arcangeli
1999-01-11 23:38 ` Zlatko Calusic
1999-01-12 2:02 ` Steve Bergman
1999-01-12 3:21 ` Results: Zlatko's new vm patch Steve Bergman
1999-01-12 5:33 ` Linus Torvalds
1999-01-12 14:49 ` Andrea Arcangeli
1999-01-12 16:58 ` Joseph Anthony
1999-01-12 18:16 ` Stephen C. Tweedie
1999-01-12 20:15 ` Michael K Vance
1999-01-13 19:25 ` Stephen C. Tweedie
1999-01-12 18:24 ` Michael K Vance
1999-01-13 0:01 ` Where to find pre7. Was: " Robert Thorncrantz
1999-01-13 20:47 ` [patch] arca-vm-19 [Re: Results: Zlatko's new vm patch] Andrea Arcangeli
1999-01-14 12:30 ` Andrea Arcangeli
1999-01-15 23:56 ` [patch] NEW: arca-vm-21, swapout via shrink_mmap using PG_dirty Andrea Arcangeli
1999-01-16 16:49 ` Andrea Arcangeli
1999-01-17 23:47 ` Andrea Arcangeli
1999-01-18 5:11 ` Linus Torvalds
1999-01-18 7:28 ` Eric W. Biederman
1999-01-18 10:00 ` Andrea Arcangeli
1999-01-18 9:15 ` Andrea Arcangeli
1999-01-18 17:49 ` Linus Torvalds
1999-01-18 19:22 ` Andrea Arcangeli
1999-01-10 20:40 ` Results: pre6 vs pre6+zlatko's_patch vs pre5 vs arcavm13 Andrea Arcangeli
1999-01-10 20:50 ` Linus Torvalds
1999-01-10 21:01 ` Andrea Arcangeli
1999-01-10 21:51 ` Steve Bergman
1999-01-10 22:50 ` Results: arcavm15, et. al Steve Bergman
1999-01-11 0:20 ` Steve Bergman
1999-01-11 13:21 ` Andrea Arcangeli
1999-01-11 3:47 ` Results: pre6 vs pre6+zlatko's_patch vs pre5 vs arcavm13 Gregory Maxwell
1999-01-06 23:35 ` arca-vm-8 [Re: [patch] arca-vm-6, killed kswapd [Re: [patch] new-vm , improvement , [Re: 2.2.0 Bug summary]]] Linus Torvalds
1999-01-07 4:30 ` Eric W. Biederman
1999-01-07 17:56 ` Linus Torvalds
1999-01-07 18:18 ` Rik van Riel
1999-01-07 19:19 ` arca-vm-8 [Re: [patch] arca-vm-6, killed kswapd [Re: [patch] Alan Cox
1999-01-07 18:55 ` arca-vm-8 [Re: [patch] arca-vm-6, killed kswapd [Re: [patch] new-vm , improvement , [Re: 2.2.0 Bug summary]]] Zlatko Calusic
1999-01-07 22:57 ` Linus Torvalds
1999-01-08 1:16 ` Linus Torvalds
1999-01-08 10:45 ` Andrea Arcangeli
1999-01-08 19:06 ` Linus Torvalds
1999-01-09 9:43 ` MM deadlock [was: Re: arca-vm-8...] Savochkin Andrey Vladimirovich
1999-01-09 18:00 ` Linus Torvalds
1999-01-09 18:41 ` Andrea Arcangeli
1999-01-10 21:41 ` Stephen C. Tweedie
1999-01-10 21:47 ` Linus Torvalds
1999-01-09 21:50 ` Linus Torvalds
1999-01-10 11:56 ` Savochkin Andrey Vladimirovich
1999-01-10 17:59 ` Andrea Arcangeli
1999-01-10 22:33 ` Stephen C. Tweedie
1999-01-10 16:59 ` Stephen C. Tweedie
1999-01-10 18:13 ` Andrea Arcangeli
1999-01-10 18:35 ` Linus Torvalds
1999-01-10 19:45 ` Alan Cox
1999-01-10 19:03 ` Andrea Arcangeli
1999-01-10 21:39 ` Stephen C. Tweedie
1999-01-10 19:09 ` Linus Torvalds
1999-01-10 20:33 ` Alan Cox
1999-01-10 20:07 ` Linus Torvalds
1999-01-10 22:18 ` Stephen C. Tweedie
1999-01-10 22:49 ` Stephen C. Tweedie
1999-01-11 6:04 ` Eric W. Biederman
1999-01-12 16:06 ` Stephen C. Tweedie
1999-01-12 17:54 ` Linus Torvalds
1999-01-12 18:44 ` Zlatko Calusic
1999-01-12 19:05 ` Andrea Arcangeli
1999-01-13 17:48 ` Stephen C. Tweedie
1999-01-13 18:07 ` 2.2.0-pre6 ain't nice =( Kalle Andersson
1999-01-13 19:05 ` MM deadlock [was: Re: arca-vm-8...] Alan Cox
1999-01-13 19:23 ` MOLNAR Ingo
1999-01-13 19:26 ` Andrea Arcangeli
1999-01-14 11:02 ` Mike Jagdis
1999-01-14 22:38 ` Andrea Arcangeli
1999-01-15 7:40 ` Agus Budy Wuysang
1999-01-14 10:48 ` Mike Jagdis
1999-01-12 21:46 ` Rik van Riel
1999-01-13 6:52 ` Zlatko Calusic
1999-01-13 13:45 ` Andrea Arcangeli
1999-01-13 13:58 ` Chris Evans
1999-01-13 15:07 ` Andrea Arcangeli
1999-01-13 22:11 ` Stephen C. Tweedie
1999-01-13 14:59 ` Rik van Riel
1999-01-13 18:10 ` Andrea Arcangeli
1999-01-13 22:14 ` Stephen C. Tweedie
1999-01-14 14:53 ` Dr. Werner Fink
1999-01-21 16:50 ` Stephen C. Tweedie
1999-01-21 19:53 ` Andrea Arcangeli
1999-01-22 13:55 ` Stephen C. Tweedie
1999-01-22 19:45 ` Andrea Arcangeli
1999-01-23 23:20 ` Alan Cox
1999-01-24 0:19 ` Linus Torvalds
1999-01-24 18:33 ` Gregory Maxwell
1999-01-25 0:21 ` Linus Torvalds
1999-01-25 1:28 ` Alan Cox
1999-01-25 3:35 ` pmonta
1999-01-25 4:17 ` Linus Torvalds
1999-01-24 20:33 ` Alan Cox
1999-01-25 0:27 ` Linus Torvalds
1999-01-25 1:38 ` Alan Cox
1999-01-25 1:04 ` Andrea Arcangeli
1999-01-25 2:10 ` Alan Cox
1999-01-25 3:16 ` Garst R. Reese
1999-01-25 10:49 ` Alan Cox
1999-01-25 14:06 ` Rik van Riel
1999-01-25 21:59 ` Gerard Roudier
1999-01-26 11:45 ` Thomas Sailer [this message]
1999-01-26 20:48 ` Gerard Roudier
1999-01-26 21:24 ` Thomas Sailer
1999-01-27 0:25 ` David Lang
1999-01-27 16:05 ` Stephen C. Tweedie
1999-01-27 20:11 ` Gerard Roudier
1999-01-26 13:06 ` Stephen C. Tweedie
1999-01-26 14:28 ` Alan Cox
1999-01-26 14:15 ` MOLNAR Ingo
1999-01-26 14:36 ` yodaiken
1999-01-26 15:21 ` MOLNAR Ingo
1999-01-27 10:31 ` yodaiken
1999-01-26 15:46 ` Alan Cox
1999-01-26 16:45 ` Stephen C. Tweedie
1999-01-30 7:01 ` yodaiken
1999-02-01 13:07 ` Stephen C. Tweedie
1999-01-26 16:37 ` Stephen C. Tweedie
1999-01-27 11:35 ` Jakub Jelinek
1999-01-26 14:21 ` Rik van Riel
1999-01-25 16:25 ` Stephen C. Tweedie
1999-01-25 16:52 ` Andrea Arcangeli
1999-01-25 18:27 ` Linus Torvalds
1999-01-25 18:43 ` Stephen C. Tweedie
1999-01-25 18:49 ` Linus Torvalds
1999-01-25 18:43 ` Linus Torvalds
1999-01-25 19:15 ` Stephen C. Tweedie
1999-01-26 1:57 ` Andrea Arcangeli
1999-01-26 18:37 ` Andrea Arcangeli
1999-01-27 12:13 ` Stephen C. Tweedie
1999-01-22 16:29 ` Eric W. Biederman
1999-01-25 13:14 ` Dr. Werner Fink
1999-01-25 17:56 ` Stephen C. Tweedie
1999-01-25 19:10 ` Andrea Arcangeli
1999-01-25 20:49 ` Dr. Werner Fink
1999-01-25 20:56 ` Linus Torvalds
1999-01-26 12:23 ` Rik van Riel
1999-01-26 15:44 ` Andrea Arcangeli
1999-01-27 14:52 ` Stephen C. Tweedie
1999-01-28 19:12 ` Dr. Werner Fink
1999-01-13 17:55 ` [PATCH] " Stephen C. Tweedie
1999-01-13 18:52 ` Andrea Arcangeli
1999-01-13 22:10 ` Stephen C. Tweedie
1999-01-13 22:30 ` Linus Torvalds
1999-01-11 11:20 ` Pavel Machek
1999-01-11 17:35 ` Stephen C. Tweedie
1999-01-11 14:11 ` Savochkin Andrey Vladimirovich
1999-01-11 17:55 ` Linus Torvalds
1999-01-11 18:37 ` Andrea Arcangeli
1999-01-08 2:56 ` arca-vm-8 [Re: [patch] arca-vm-6, killed kswapd [Re: [patch] new-vm , improvement , [Re: 2.2.0 Bug summary]]] Eric W. Biederman
1999-01-09 0:50 ` David S. Miller
1999-01-09 2:13 ` Stephen C. Tweedie
1999-01-09 2:34 ` Andrea Arcangeli
1999-01-09 9:30 ` Stephen C. Tweedie
1999-01-09 12:11 ` Andrea Arcangeli
1999-01-07 14:11 ` Andrea Arcangeli
1999-01-07 18:19 ` Linus Torvalds
1999-01-07 20:35 ` Andrea Arcangeli
1999-01-07 23:51 ` Linus Torvalds
1999-01-08 0:04 ` Andrea Arcangeli
1999-01-04 22:43 ` [patch] arca-vm-6, killed kswapd [Re: [patch] new-vm improvement , [Re: 2.2.0 Bug summary]] Andrea Arcangeli
1999-01-04 22:29 ` Andrea Arcangeli
1999-01-05 13:33 ` [patch] new-vm improvement [Re: 2.2.0 Bug summary] Ben McCann
1999-01-02 20:04 ` Steve Bergman
1999-01-02 3:03 ` Andrea Arcangeli
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