From: Roger Larsson <roger.larsson@norran.net>
To: Rik van Riel <riel@conectiva.com.br>
Cc: linux-mm@kvack.org
Subject: PG_referenced and lru_cache (cpu%)...
Date: Sat, 06 May 2000 22:12:41 +0200 [thread overview]
Message-ID: <39147CB9.256D1EEA@norran.net> (raw)
In-Reply-To: 39145287.D8F1F0C1@sgi.com
Hi,
When _add_to_page_cache adds a page to the lru_cache
it forces it to be referenced.
In addition it will be added as youngest in list.
When a page is needed it is very likely that a lot of
the youngest pages are marked as referenced.
In other cases when a pages is moved to front the
PG_referenced is cleared.
order=0 is the only that tries to search the full list.
When the shrink_mmap finds PG_referenced pages they are
moved to local list young and will not be inserted before
shink_mmap returns, again does not matter...
With "all" possible pages in young, the list is searched
maxloop (256) times... (with a lot of CPU usage)
Conclusion:
I think PG_reference should be cleared in lru_cache_add
and that shrink_mmap should place referenced pages on top
not on an separate list.
--
Home page:
http://www.norran.net/nra02596/
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux.eu.org/Linux-MM/
next prev parent reply other threads:[~2000-05-06 20:12 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <8evk0f$7jote$1@fido.engr.sgi.com>
2000-05-06 17:12 ` [DATAPOINT] pre7-6 will not swap Rajagopal Ananthanarayanan
2000-05-06 4:25 ` Benjamin Redelings I
2000-05-06 19:35 ` Linus Torvalds
2000-05-06 5:35 ` Benjamin Redelings I
2000-05-06 21:46 ` Rik van Riel
2000-05-06 22:24 ` Rajagopal Ananthanarayanan
2000-05-06 14:03 ` Benjamin Redelings I
2000-05-07 0:22 ` Rik van Riel
2000-05-07 2:23 ` Linus Torvalds
2000-05-07 17:40 ` Rik van Riel
2000-05-07 17:53 ` Linus Torvalds
2000-05-07 19:13 ` Rajagopal Ananthanarayanan
2000-05-07 19:30 ` Linus Torvalds
2000-05-08 20:40 ` gprof data for pre7-6 Rajagopal Ananthanarayanan
2000-05-09 1:52 ` [DATAPOINT] pre7-6 will not swap Quintela Carreira Juan J.
2000-05-09 2:28 ` Rajagopal Ananthanarayanan
2000-05-09 2:33 ` Linus Torvalds
2000-05-09 3:31 ` Rajagopal Ananthanarayanan
2000-05-09 15:56 ` [DATAPOINT] pre7-8 swaps with FREE mem? Benjamin Redelings I
2000-05-06 20:12 ` Roger Larsson [this message]
2000-05-06 18:31 ` PG_referenced and lru_cache (cpu%) Rik van Riel
2000-05-06 22:16 ` Roger Larsson
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=39147CB9.256D1EEA@norran.net \
--to=roger.larsson@norran.net \
--cc=linux-mm@kvack.org \
--cc=riel@conectiva.com.br \
/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.