svn commit: r284654 - head/sys/vm

Alan Cox alc at FreeBSD.org
Sun Jun 21 01:22:36 UTC 2015


Author: alc
Date: Sun Jun 21 01:22:35 2015
New Revision: 284654
URL: https://svnweb.freebsd.org/changeset/base/284654

Log:
  Avoid pmap_is_modified() on pages that can't be mapped.
  
  MFC after:	1 week
  Sponsored by:	EMC / Isilon Storage Division

Modified:
  head/sys/vm/vm_pageout.c

Modified: head/sys/vm/vm_pageout.c
==============================================================================
--- head/sys/vm/vm_pageout.c	Sun Jun 21 00:36:02 2015	(r284653)
+++ head/sys/vm/vm_pageout.c	Sun Jun 21 01:22:35 2015	(r284654)
@@ -1226,9 +1226,11 @@ vm_pageout_scan(struct vm_domain *vmd, i
 		 * then the page may still be modified until the last of those
 		 * mappings are removed.
 		 */
-		vm_page_test_dirty(m);
-		if (m->dirty == 0 && object->ref_count != 0)
-			pmap_remove_all(m);
+		if (object->ref_count != 0) {
+			vm_page_test_dirty(m);
+			if (m->dirty == 0)
+				pmap_remove_all(m);
+		}
 
 		if (m->dirty == 0) {
 			/*


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