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Advantage: Pages are only in a linked list when they are NOT active (free/zeroed, for now). This makes the LIST_ENTRY fields usable when a page is active, so we can store data in there. This will make it easier to sync our PFN format with Windows.
Advantage: It's a lot faster to set/clear bits than to do list operations (both still O1 though). Scanning for the bit is a bit slower than parsing a list, on the other hand, so it's a toss.
Disadvantage: We lose LRU, which in theory makes us cannibalize working sets randomly instead of by-usage. However, considering the speed of ReactOS paging, and the effects of canabalizing the WS in the first place, I doubt this is really a problem.
The main point of this is advantage #1 -- making used pages not be on any lists. This will allow us to almost 100% sync the PFN layouts, which will lead to the eventual negation of any temporary disavantages.
svn path=/trunk/; revision=45616
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