K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2015-06-14T05:23:39.566514Z
K 7
svn:log
V 566
As the next step in eliminating PG_CACHE pages, free rather than cache
pages in vm_pageout_scan().  The reactivation rate of cache pages created
by vm_pageout_scan() is extremely low; typically no more than 0.5% to
2.25% of the pages are ever reactivated.  At the same time, caching pages
is more expensive than freeing them.  For example, in a test with
PostgreSQL, this change reduced the amount of time spent in the inactive
queue scan by 1/6.

Differential Revision:	https://reviews.freebsd.org/D2805
Reviewed by:	kib
Sponsored by:	EMC / Isilon Storage Division

END