K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2019-12-28T19:03:17.494406Z
K 7
svn:log
V 995
Don't update per-page activation counts in the swapout code.

This avoids duplicating the work of the page daemon's active queue scan.
Moreover, this duplication was inconsistent:
- PGA_REFERENCED is not counted in act_count unless pmap_ts_referenced()
  returned 0, but the page daemon always counts PGA_REFERENCED towards
  the activation count.
- The swapout daemon always activates a referenced page, but the page
  daemon only does so when the containing object is mapped at least
  once.

The main purpose of swapout_deactivate_pages() is to shrink the number
of pages mapped into a given pmap.  To do this without unmapping active
pages, use the non-destructive pmap_is_referenced() instead of the
destructive pmap_ts_referenced() and deactivate pages accordingly.
This simplifies some future changes to the locking protocol for page
queue state.

Reviewed by:	kib
Discussed with:	jeff
Tested by:	pho
Sponsored by:	Netflix, Intel
Differential Revision:	https://reviews.freebsd.org/D22674

END