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.
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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
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