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Code Issues Releases Activity

- Extend the scope of the backing object's lock in vm_object_collapse().

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This commit is contained in:
Alan Cox 2003-06-05 20:55:27 +00:00
parent d30350e524
commit 40b808a842
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=115879
1 changed files with 4 additions and 2 deletions
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6
sys/vm/vm_object.c
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@ -1515,6 +1515,7 @@ vm_object_collapse(vm_object_t object)
* we check the backing object first, because it is most likely
* not collapsable.
*/
VM_OBJECT_LOCK(backing_object);
if (backing_object->handle != NULL ||
(backing_object->type != OBJT_DEFAULT &&
backing_object->type != OBJT_SWAP) ||
@ -1523,6 +1524,7 @@ vm_object_collapse(vm_object_t object)
(object->type != OBJT_DEFAULT &&
object->type != OBJT_SWAP) ||
(object->flags & OBJ_DEAD)) {
VM_OBJECT_UNLOCK(backing_object);
break;
}
@ -1531,6 +1533,7 @@ vm_object_collapse(vm_object_t object)
backing_object->paging_in_progress != 0
) {
vm_object_qcollapse(object);
VM_OBJECT_UNLOCK(backing_object);
break;
}
@ -1554,7 +1557,6 @@ vm_object_collapse(vm_object_t object)
/*
* Move the pager from backing_object to object.
*/
VM_OBJECT_LOCK(backing_object);
if (backing_object->type == OBJT_SWAP) {
vm_object_pip_add(backing_object, 1);
VM_OBJECT_UNLOCK(backing_object);
@ -1642,6 +1644,7 @@ vm_object_collapse(vm_object_t object)
* there is nothing we can do so we give up.
*/
if (vm_object_backing_scan(object, OBSC_TEST_ALL_SHADOWED) == 0) {
VM_OBJECT_UNLOCK(backing_object);
break;
}
@ -1650,7 +1653,6 @@ vm_object_collapse(vm_object_t object)
* chain. Deallocating backing_object will not remove
* it, since its reference count is at least 2.
*/
VM_OBJECT_LOCK(backing_object);
LIST_REMOVE(object, shadow_list);
backing_object->shadow_count--;
backing_object->generation++;