Priority paging is the name that SUN gives to what should be the default way of handling virtual memory. One of the things that drove me nuts when I moved from HP to SUN was the fact that there was no way to limit the filesystem buffer cache (bufpages, dbc_min_pct/dbc_max_pct, & nbuf, if'n you're curious re HP). I would have a system with 4-gigs of RAM actively paging because of the cache. There's something not right with that.
So, SUN introduced the concept of priority paging. There's a paper on sun-on-net that describes the issue and the solution a whole lot better than I could. It's called: Priority Paging by Richard McDougall, Triet Vo, and Tom Pothier.
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