On Thu, 18 Aug 2005, Gregory Maxwell wrote:

With the ability to measure something approximating least frequently
used inactive pages now, would it not make sense to begin more
aggressive nonevicting preswapping?

Maybe. What would be the overhead for cases in which swapping is not 
needed?
 

For example, if the swap disks are not busy, we scan the least
frequently used inactive pages, and write them out in nice large
chunks. The pages are moved to another list, but not evicted from
memory. The normal swapping algorithm is used to decide when/if to
actually evict these pages from memory.  If they are used prior to
being evicted, they can be remarked active (and their blocks on swap
marked as unused) without a disk seek.

If you write out the pages then one could simply mark them as clean and 
note where the location is in swap space.
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