Revert the addition of the freelist argument for the vm_map_delete()

function, done in r188334. Instead, collect the entries that shall be
freed, in the deferred_freelist member of the map. Automatically purge
the deferred freelist when map is unlocked.

Tested by:	pho
Reviewed by:	alc

sys/vm/vm_kern.c

@@ -272,7 +272,7 @@ kmem_malloc(map, size, flags)
 	int flags;
 {
 	vm_offset_t offset, i;
-	vm_map_entry_t entry, freelist;
+	vm_map_entry_t entry;
 	vm_offset_t addr;
 	vm_page_t m;
 	int pflags;
@@ -356,10 +356,8 @@ kmem_malloc(map, size, flags)
 				vm_page_unlock_queues();
 			}
 			VM_OBJECT_UNLOCK(kmem_object);
-			freelist = NULL;
-			vm_map_delete(map, addr, addr + size, &freelist);
+			vm_map_delete(map, addr, addr + size);
 			vm_map_unlock(map);
-			vm_map_entry_free_freelist(map, freelist);
 			return (0);
 		}
 		if (flags & M_ZERO && (m->flags & PG_ZERO) == 0)
@@ -458,18 +456,14 @@ kmem_free_wakeup(map, addr, size)
 	vm_offset_t addr;
 	vm_size_t size;
 {
-	vm_map_entry_t freelist;
 
-	freelist = NULL;
 	vm_map_lock(map);
-	(void) vm_map_delete(map, trunc_page(addr), round_page(addr + size),
-	     &freelist);
+	(void) vm_map_delete(map, trunc_page(addr), round_page(addr + size));
 	if (map->needs_wakeup) {
 		map->needs_wakeup = FALSE;
 		vm_map_wakeup(map);
 	}
 	vm_map_unlock(map);
-	vm_map_entry_free_freelist(map, freelist);
 }
 
 /*

sys/vm/vm_map.c

@@ -143,7 +143,7 @@ static void vmspace_zfini(void *mem, int size);
 static int vm_map_zinit(void *mem, int ize, int flags);
 static void vm_map_zfini(void *mem, int size);
 static void _vm_map_init(vm_map_t map, vm_offset_t min, vm_offset_t max);
-
+static void vm_map_entry_dispose(vm_map_t map, vm_map_entry_t entry);
 #ifdef INVARIANTS
 static void vm_map_zdtor(void *mem, int size, void *arg);
 static void vmspace_zdtor(void *mem, int size, void *arg);
@@ -456,11 +456,28 @@ _vm_map_lock(vm_map_t map, const char *file, int line)
 void
 _vm_map_unlock(vm_map_t map, const char *file, int line)
 {
+	vm_map_entry_t free_entry, entry;
+	vm_object_t object;
+
+	free_entry = map->deferred_freelist;
+	map->deferred_freelist = NULL;
 
 	if (map->system_map)
 		_mtx_unlock_flags(&map->system_mtx, 0, file, line);
 	else
 		_sx_xunlock(&map->lock, file, line);
+
+	while (free_entry != NULL) {
+		entry = free_entry;
+		free_entry = free_entry->next;
+
+		if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
+			object = entry->object.vm_object;
+			vm_object_deallocate(object);
+		}
+
+		vm_map_entry_dispose(map, entry);
+	}
 }
 
 void
@@ -682,6 +699,7 @@ _vm_map_init(vm_map_t map, vm_offset_t min, vm_offset_t max)
 	map->flags = 0;
 	map->root = NULL;
 	map->timestamp = 0;
+	map->deferred_freelist = NULL;
 }
 
 void
@@ -1297,19 +1315,16 @@ vm_map_fixed(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
     vm_offset_t start, vm_size_t length, vm_prot_t prot,
     vm_prot_t max, int cow)
 {
-	vm_map_entry_t freelist;
 	vm_offset_t end;
 	int result;
 
 	end = start + length;
-	freelist = NULL;
 	vm_map_lock(map);
 	VM_MAP_RANGE_CHECK(map, start, end);
-	(void) vm_map_delete(map, start, end, &freelist);
+	(void) vm_map_delete(map, start, end);
 	result = vm_map_insert(map, object, offset, start, end, prot,
 	    max, cow);
 	vm_map_unlock(map);
-	vm_map_entry_free_freelist(map, freelist);
 	return (result);
 }
 
@@ -2435,23 +2450,6 @@ vm_map_entry_unwire(vm_map_t map, vm_map_entry_t entry)
 	entry->wired_count = 0;
 }
 
-void
-vm_map_entry_free_freelist(vm_map_t map, vm_map_entry_t freelist)
-{
-	vm_map_entry_t e;
-	vm_object_t object;
-
-	while (freelist != NULL) {
-		e = freelist;
-		freelist = freelist->next;
-		if ((e->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
-			object = e->object.vm_object;
-			vm_object_deallocate(object);
-		}
-		vm_map_entry_dispose(map, e);
-	}
-}
-
 /*
  *	vm_map_entry_delete:	[ internal use only ]
  *
@@ -2495,8 +2493,7 @@ vm_map_entry_delete(vm_map_t map, vm_map_entry_t entry)
  *	map.
  */
 int
-vm_map_delete(vm_map_t map, vm_offset_t start, vm_offset_t end,
-    vm_map_entry_t *freelist)
+vm_map_delete(vm_map_t map, vm_offset_t start, vm_offset_t end)
 {
 	vm_map_entry_t entry;
 	vm_map_entry_t first_entry;
@@ -2575,8 +2572,8 @@ vm_map_delete(vm_map_t map, vm_offset_t start, vm_offset_t end,
 		 * will be set in the wrong object!)
 		 */
 		vm_map_entry_delete(map, entry);
-		entry->next = *freelist;
-		*freelist = entry;
+		entry->next = map->deferred_freelist;
+		map->deferred_freelist = entry;
 		entry = next;
 	}
 	return (KERN_SUCCESS);
@@ -2591,15 +2588,12 @@ vm_map_delete(vm_map_t map, vm_offset_t start, vm_offset_t end,
 int
 vm_map_remove(vm_map_t map, vm_offset_t start, vm_offset_t end)
 {
-	vm_map_entry_t freelist;
 	int result;
 
-	freelist = NULL;
 	vm_map_lock(map);
 	VM_MAP_RANGE_CHECK(map, start, end);
-	result = vm_map_delete(map, start, end, &freelist);
+	result = vm_map_delete(map, start, end);
 	vm_map_unlock(map);
-	vm_map_entry_free_freelist(map, freelist);
 	return (result);
 }
 

sys/vm/vm_map.h

@@ -157,8 +157,6 @@ vm_map_entry_system_wired_count(vm_map_entry_t entry)
 {
 	return (entry->wired_count - vm_map_entry_user_wired_count(entry));
 }
-
-void vm_map_entry_free_freelist(vm_map_t map, vm_map_entry_t freelist);
 #endif	/* _KERNEL */
 
 /*
@@ -184,6 +182,7 @@ struct vm_map {
 	vm_flags_t flags;		/* flags for this vm_map */
 	vm_map_entry_t root;		/* Root of a binary search tree */
 	pmap_t pmap;			/* (c) Physical map */
+	vm_map_entry_t deferred_freelist;
 #define	min_offset	header.start	/* (c) */
 #define	max_offset	header.end	/* (c) */
 };
@@ -338,7 +337,7 @@ long vmspace_wired_count(struct vmspace *vmspace);
 #ifdef _KERNEL
 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
 vm_map_t vm_map_create(pmap_t, vm_offset_t, vm_offset_t);
-int vm_map_delete(vm_map_t, vm_offset_t, vm_offset_t, vm_map_entry_t *);
+int vm_map_delete(vm_map_t, vm_offset_t, vm_offset_t);
 int vm_map_find(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t,
     int, vm_prot_t, vm_prot_t, int);
 int vm_map_fixed(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_size_t,

sys/vm/vm_mmap.c

@@ -552,7 +552,6 @@ munmap(td, uap)
 	vm_offset_t addr;
 	vm_size_t size, pageoff;
 	vm_map_t map;
-	vm_map_entry_t freelist;
 
 	addr = (vm_offset_t) uap->addr;
 	size = uap->len;
@@ -572,7 +571,6 @@ munmap(td, uap)
 	map = &td->td_proc->p_vmspace->vm_map;
 	if (addr < vm_map_min(map) || addr + size > vm_map_max(map))
 		return (EINVAL);
-	freelist = NULL;
 	vm_map_lock(map);
 #ifdef HWPMC_HOOKS
 	/*
@@ -595,9 +593,8 @@ munmap(td, uap)
 	}
 #endif
 	/* returns nothing but KERN_SUCCESS anyway */
-	vm_map_delete(map, addr, addr + size, &freelist);
+	vm_map_delete(map, addr, addr + size);
 	vm_map_unlock(map);
-	vm_map_entry_free_freelist(map, freelist);
 	return (0);
 }
 

sys/vm/vm_unix.c

@@ -72,7 +72,6 @@ obreak(td, uap)
 	struct obreak_args *uap;
 {
 	struct vmspace *vm = td->td_proc->p_vmspace;
-	vm_map_entry_t freelist;
 	vm_offset_t new, old, base;
 	rlim_t datalim, vmemlim;
 	int rv;
@@ -86,7 +85,6 @@ obreak(td, uap)
 
 	do_map_wirefuture = FALSE;
 	new = round_page((vm_offset_t)uap->nsize);
-	freelist = NULL;
 	vm_map_lock(&vm->vm_map);
 
 	base = round_page((vm_offset_t) vm->vm_daddr);
@@ -140,7 +138,7 @@ obreak(td, uap)
 			do_map_wirefuture = TRUE;
 		}
 	} else if (new < old) {
-		rv = vm_map_delete(&vm->vm_map, new, old, &freelist);
+		rv = vm_map_delete(&vm->vm_map, new, old);
 		if (rv != KERN_SUCCESS) {
 			error = ENOMEM;
 			goto done;
@@ -149,7 +147,6 @@ obreak(td, uap)
 	}
 done:
 	vm_map_unlock(&vm->vm_map);
-	vm_map_entry_free_freelist(&vm->vm_map, freelist);
 
 	if (do_map_wirefuture)
 		(void) vm_map_wire(&vm->vm_map, old, new,