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Subject[PATCH] 2.3 VM balancing

here is a quick patch that seems to improve VM
performance in 2.3 quite a bit. It works because
it will 'force' kswapd to keep a decent amount of
pages in the LRU queues. This makes sure that we
actually do some page aging on the pages before
evicting them.

A nice side effect is that kswapd runs much smoother
now because when memory pressure increases and it'll
work harder, it will "loop" in do_try_to_free_pages()
and find a whole load of freeable pages when it drops
a point in priority...


The Internet is not a network of computers. It is a network
of people. That is its real strength.

--- linux-2.3.41/mm/filemap.c.orig Sat Feb 5 04:06:03 2000
+++ linux-2.3.41/mm/filemap.c Fri Feb 4 18:32:12 2000
@@ -289,6 +289,12 @@
goto cache_unlock_continue;

+ * We did the page aging part.
+ */
+ if (nr_lru_pages < freepages.min * priority)
+ goto cache_unlock_continue;
+ /*
* Is it a page swap page? If so, we want to
* drop it if it is no longer used, even if it
* were to be marked referenced..

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