From: Linus Torvalds <torvalds@transmeta.com>
To: Andrea Arcangeli <andrea@e-mind.com>
Cc: steve@netplus.net, brent verner <damonbrent@earthlink.net>,
"Garst R. Reese" <reese@isn.net>,
Kalle Andersson <kalle.andersson@mbox303.swipnet.se>,
Zlatko Calusic <Zlatko.Calusic@CARNet.hr>,
Ben McCann <bmccann@indusriver.com>,
bredelin@ucsd.edu, linux-kernel@vger.rutgers.edu,
linux-mm@kvack.org
Subject: Re: arca-vm-8 [Re: [patch] arca-vm-6, killed kswapd [Re: [patch] new-vm , improvement , [Re: 2.2.0 Bug summary]]]
Date: Thu, 7 Jan 1999 10:19:09 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.3.95.990107100923.4270L-100000@penguin.transmeta.com> (raw)
In-Reply-To: <Pine.LNX.3.96.990107145522.5867B-100000@laser.bogus>
On Thu, 7 Jan 1999, Andrea Arcangeli wrote:
>
> This first patch allow swap_out to have a more fine grined weight. Should
> help at least in low memory envinronments.
The basic reason I didn't want to do this was that I thought it was wrong
to try to base _any_ decision on any virtual memory sizes. The reason is
simply that I think RSS isn't a very interesting thing to look at.
Yes, the current version also looks at RSS, but if you actually read the
code and think about what it does, it really only uses RSS as an
"ordering" issue, and it doesn't actually matter for anything else -
we'll walk through all processes until they are all exhausted, and the
only thing that RSS does for us is to start off with the larger one.
Basically, it doesn't matter for anything but startup, because the steady
state will essentially just be a "go through each process in the list over
and over again", and the fact that the list has some ordering is pretty
much inconsequential.
The real decision on what to throw out is done by the physical page scan,
that takes the PG_referenced bit into account.
So essentially, if we get anything wrong when we do the virtual page table
walk, the only thing that results in is that we might handle a few extra
page faults (not no extra IO, because the page faults will be satisfied
from the victim caches - the page cache and the swap cache).
The only case this isn't true is the case where we have a shared file
mapping. That's where the PG_dirty issues come in - we've never done that
well from a performance standpoint, and pre-5 does not change that fact,
it just lays some foundations for doing it right in the future.
So that's why I'd prefer to not complicate the VM counting any more. I
don't think it should make any fundamental difference (it might make a
difference in various extreme cases, but not, I think, under any kind of
realistic load).
But who knows, I've been wrong before. But now at least you know why I
didn't want it in the default kernel.
> This other patch instead change a bit the trashing memory heuristic and
> how many pages are freed every time. I am not sure it's the best thing to
> do. So if you'll try it let me know the results...
I think this might well be tuned some, although I think your patch is
extreme. I'd love to hear comments from people who test it under different
loads and different memory sizes.
Linus
--
This is a majordomo managed list. To unsubscribe, send a message with
the body 'unsubscribe linux-mm me@address' to: majordomo@kvack.org
next prev parent reply other threads:[~1999-01-07 18:21 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
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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Pine.LNX.3.95.990107100923.4270L-100000@penguin.transmeta.com \
--to=torvalds@transmeta.com \
--cc=Zlatko.Calusic@CARNet.hr \
--cc=andrea@e-mind.com \
--cc=bmccann@indusriver.com \
--cc=bredelin@ucsd.edu \
--cc=damonbrent@earthlink.net \
--cc=kalle.andersson@mbox303.swipnet.se \
--cc=linux-kernel@vger.rutgers.edu \
--cc=linux-mm@kvack.org \
--cc=reese@isn.net \
--cc=steve@netplus.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.