svn commit: r333799 - head/sys/vm

[Mark Johnston]

Author: markj
Date: Fri May 18 16:59:58 2018
New Revision: 333799
URL: https://svnweb.freebsd.org/changeset/base/333799

Log:
  Don't increment addl_page_shortage for wired pages.
  
  Such pages are dequeued as they're encountered during the inactive queue
  scan, so by the time we get to the active queue scan, they should have
  already been subtracted from the inactive queue length.
  
  Reviewed by:	alc
  Differential Revision:	https://reviews.freebsd.org/D15479

Modified:
  head/sys/vm/vm_pageout.c

Modified: head/sys/vm/vm_pageout.c
==============================================================================
--- head/sys/vm/vm_pageout.c	Fri May 18 16:19:45 2018	(r333798)
+++ head/sys/vm/vm_pageout.c	Fri May 18 16:59:58 2018	(r333799)
@@ -1201,7 +1201,7 @@ vm_pageout_scan(struct vm_domain *vmd, int pass, int s
 	}
 
 	/*
-	 * The addl_page_shortage is the number of temporarily
+	 * The addl_page_shortage is an estimate of the number of temporarily
 	 * stuck pages in the inactive queue.  In other words, the
 	 * number of pages from the inactive count that should be
 	 * discounted in setting the target for the active queue scan.
@@ -1275,7 +1275,6 @@ recheck:
 			goto reinsert;
 		}
 		if (m->wire_count != 0) {
-			addl_page_shortage++;
 			vm_page_dequeue_deferred(m);
 			continue;
 		}