Index: sys/vm/vm_fault.c
===================================================================
--- sys/vm/vm_fault.c
+++ sys/vm/vm_fault.c
@@ -1080,7 +1080,6 @@
 vm_fault_allocate(struct faultstate *fs)
 {
 	struct domainset *dset;
-	int alloc_req;
 	int rv;
 
 	if ((fs->object->flags & OBJ_SIZEVNLOCK) != 0) {
@@ -1117,9 +1116,14 @@
 	/*
 	 * Allocate a new page for this object/offset pair.
 	 *
-	 * Unlocked read of the p_flag is harmless. At worst, the P_KILLED
-	 * might be not observed there, and allocation can fail, causing
-	 * restart and new reading of the p_flag.
+	 * If the process has a fatal signal pending, prioritize the allocation
+	 * with the expectation that the process will exit shortly and free some
+	 * pages.  In particular, the signal may have been posted by the page
+	 * daemon in an attempt to resolve an out-of-memory condition.
+	 *
+	 * The unlocked read of the p_flag is harmless. At worst, the P_KILLED
+	 * might be not observed there, and allocation can fail, causing restart
+	 * and new reading of the p_flag.
 	 */
 	dset = fs->object->domain.dr_policy;
 	if (dset == NULL)
@@ -1128,12 +1132,8 @@
 #if VM_NRESERVLEVEL > 0
 		vm_object_color(fs->object, atop(fs->vaddr) - fs->pindex);
 #endif
-		alloc_req = P_KILLED(curproc) ?
-		    VM_ALLOC_SYSTEM : VM_ALLOC_NORMAL;
-		if (fs->object->type != OBJT_VNODE &&
-		    fs->object->backing_object == NULL)
-			alloc_req |= VM_ALLOC_ZERO;
-		fs->m = vm_page_alloc(fs->object, fs->pindex, alloc_req);
+		fs->m = vm_page_alloc(fs->object, fs->pindex,
+		    P_KILLED(curproc) ? VM_ALLOC_SYSTEM : VM_ALLOC_NORMAL);
 	}
 	if (fs->m == NULL) {
 		unlock_and_deallocate(fs);