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Date: Thu, 26 Feb 1998 22:44:08 GMT
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From: "Stephen C. Tweedie" <sct@dcs.ed.ac.uk>
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Subject: Re: Fairness in love and swapping
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To: Rik van Riel <H.H.vanRiel@fys.ruu.nl>
Cc: "Dr. Werner Fink" <werner@suse.de>, sct@dcs.ed.ac.uk, torvalds@transmeta.com, nahshon@actcom.co.il, alan@lxorguk.ukuu.org.uk, paubert@iram.es, mingo@chiara.csoma.elte.hu, linux-mm@kvack.org
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Hi,

On Thu, 26 Feb 1998 12:34:40 +0100 (MET), Rik van Riel
<H.H.vanRiel@fys.ruu.nl> said:

> 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.

--Stephen