K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2016-08-01T17:25:07.846318Z
K 7
svn:log
V 738
Restore the historical behavior of "sysctl vm.swap_idle_enabled=1".  Prior
to r254304, we had separate functions for reclamation and laundering
(vm_pageout_scan) versus updating usage information, i.e., "reference
bits", on active pages (vm_pageout_page_stats), and we only performed
vm_req_vmdaemon(VM_SWAP_IDLE) if vm_pages_needed was true.  However, since
r254303, if vm_swap_idle_enabled was "1", we have performed
vm_req_vmdaemon(VM_SWAP_IDLE) regardless of whether we are short of free
pages.  This was unintended and too aggressive, so I suspect no one uses
this feature.  With this change, we restore the historical behavior and
only perform vm_req_vmdaemon(VM_SWAP_IDLE) when we are short of free
pages.

Reviewed by:	kib, markj

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