From: Rik van Riel <H.H.vanRiel@fys.ruu.nl>
To: "Stephen C. Tweedie" <sct@dcs.ed.ac.uk>
Cc: "Dr. Werner Fink" <werner@suse.de>,
torvalds@transmeta.com, nahshon@actcom.co.il,
alan@lxorguk.ukuu.org.uk, paubert@iram.es,
mingo@chiara.csoma.elte.hu, linux-mm@kvack.org
Subject: Re: Fairness in love and swapping
Date: Fri, 27 Feb 1998 00:34:59 +0100 (MET) [thread overview]
Message-ID: <Pine.LNX.3.91.980227003050.6476B-100000@mirkwood.dummy.home> (raw)
In-Reply-To: <199802262244.WAA03924@dax.dcs.ed.ac.uk>
On Thu, 26 Feb 1998, Stephen C. Tweedie wrote:
> > Without my mmap-age patch, page cache pages aren't aged
> > at all... They're just freed whenever they weren't referenced
> > since the last scan. The PAGE_AGE_VALUE is quite useless IMO
> > (but I could be wrong, Stephen?).
>
> They _are_ useful for mapped images such as binaries (which are swapped
> out by vmscan.c, not filemap.c), but not for otherwise unused, pure
> cached pages.
AFAIK, mapped images aren't part of a proces' RSS, but
are page-cached (page->inode type of RSS). And swapping
of those vma's _is_ done in shrink_mmap() in filemap.c.
Furthermore, it's quite useful if your read-ahead pages
stay in memory for a while so you don't read them two
or even three times before they're actually used.
But if I've overlooked something, I'd really like to
hear about it... A bit of a clue never hurts when
coding up new patches :-)
Rik.
+-----------------------------+------------------------------+
| For Linux mm-patches, go to | "I'm busy managing memory.." |
| my homepage (via LinuxHQ). | H.H.vanRiel@fys.ruu.nl |
| ...submissions welcome... | http://www.fys.ruu.nl/~riel/ |
+-----------------------------+------------------------------+
next prev parent reply other threads:[~1998-02-27 0:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-02-25 20:32 Stephen C. Tweedie
1998-02-25 21:02 ` Linus Torvalds
1998-02-25 21:44 ` Rik van Riel
1998-02-25 21:39 ` Dr. Werner Fink
1998-02-25 22:27 ` Rik van Riel
1998-02-26 11:03 ` Dr. Werner Fink
1998-02-26 11:34 ` Rik van Riel
1998-02-26 18:57 ` Dr. Werner Fink
1998-02-26 19:32 ` Rik van Riel
1998-02-26 22:44 ` Stephen C. Tweedie
1998-02-26 23:34 ` Rik van Riel [this message]
1998-02-27 19:41 ` Stephen C. Tweedie
1998-03-02 16:19 ` Rik van Riel
1998-03-02 22:35 ` Stephen C. Tweedie
1998-03-02 23:14 ` Rik van Riel
1998-03-03 22:59 ` Stephen C. Tweedie
1998-02-26 8:05 ` Rogier Wolff
1998-02-26 13:00 ` Dr. Werner Fink
1998-02-26 22:36 ` Stephen C. Tweedie
1998-02-26 23:20 ` Dr. Werner Fink
1998-02-26 14:30 ` Rik van Riel
1998-02-26 22:41 ` Stephen C. Tweedie
1998-02-26 23:21 ` Rik van Riel
1998-02-26 22:33 ` Stephen C. Tweedie
1998-02-26 22:49 ` Rik van Riel
1998-02-27 2:56 ` Michael O'Reilly
[not found] <199802270729.IAA00680@cave.BitWizard.nl>
1998-02-27 11:26 ` Rik van Riel
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