The active queue scan updates act_count based on the return value of
pmap_ts_referenced() and whether PGA_REFERENCED is set. It deactivates
the page if the activation count goes to zero. Implement this logic
using vm_page_pqstate_commit().
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Details
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Buildable 28259 Build 26377: arc lint + arc unit
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Rename the next_page target to skip_page, and unbusy the page at the end
of the loop instead of having lots of inline calls to vm_page_xunbusy().