MFC r207306

  Change vm_object_madvise() so that it checks whether the page is invalid
  or unmanaged before acquiring the page queues lock.  Neither of these
  tests require that lock.  Moreover, a better way of testing if the page
  is unmanaged is to test the type of vm object.  This avoids a pointless
  vm_page_lookup().

1 files changed, 6 insertions, 10 deletions

diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
index 7e4dbc8..c25ab77 100644
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -1162,7 +1162,8 @@ shadowlookup:
 			    (tobject->flags & OBJ_ONEMAPPING) == 0) {
 				goto unlock_tobject;
 			}
-		}
+		} else if (tobject->type == OBJT_PHYS)
+			goto unlock_tobject;
 		m = vm_page_lookup(tobject, tpindex);
 		if (m == NULL && advise == MADV_WILLNEED) {
 			/*
@@ -1189,18 +1190,13 @@ shadowlookup:
 				VM_OBJECT_UNLOCK(tobject);
 			tobject = backing_object;
 			goto shadowlookup;
-		}
+		} else if (m->valid != VM_PAGE_BITS_ALL)
+			goto unlock_tobject;
 		/*
-		 * If the page is busy or not in a normal active state,
-		 * we skip it.  If the page is not managed there are no
-		 * page queues to mess with.  Things can break if we mess
-		 * with pages in any of the below states.
+		 * If the page is not in a normal state, skip it.
 		 */
 		vm_page_lock_queues();
-		if (m->hold_count ||
-		    m->wire_count ||
-		    (m->flags & PG_UNMANAGED) ||
-		    m->valid != VM_PAGE_BITS_ALL) {
+		if (m->hold_count != 0 || m->wire_count != 0) {
 			vm_page_unlock_queues();
 			goto unlock_tobject;
 		}