new kswapd logic

[Rik van Riel <H.H.vanRiel@fys.ruu.nl>]

Hi Linus,

with my new free_memory_available() patch, it
should be possible to put in my kswapd logic
patch again.

Besides, since my kswapd logic patch _does_
put a limit on the number of freed pages, and
the old mechanism doesn't, my algoritm should
(in theory) prevent the 'my machine just swapped
out 24 of 48 megs of memory' messages we've been
getting on linux-kernel this weekend.

Linus, I've been testing my new kswapd and
free_memory_available() patches, and they work
better than the original ones, so please put
them in...

Rik.
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