svn commit: r247661 - user/attilio/vmc-playground/sys/vm
Alan Cox
alc at FreeBSD.org
Sat Mar 2 18:18:31 UTC 2013
Author: alc
Date: Sat Mar 2 18:18:30 2013
New Revision: 247661
URL: http://svnweb.freebsd.org/changeset/base/247661
Log:
Assert that the trie is empty when a vm object is destroyed.
Since vm objects are allocated from type-stable memory, we don't need to
initialize the trie's root in _vm_object_allocate() on every vm object
allocation. We can instead do it once in vm_object_zinit().
We don't need to call vm_radix_reclaim_allnodes() in vm_object_terminate()
unless the resident page count is non-zero.
Reviewed by: attilio
Sponsored by: EMC / Isilon Storage Division
Modified:
user/attilio/vmc-playground/sys/vm/vm_object.c
Modified: user/attilio/vmc-playground/sys/vm/vm_object.c
==============================================================================
--- user/attilio/vmc-playground/sys/vm/vm_object.c Sat Mar 2 18:08:03 2013 (r247660)
+++ user/attilio/vmc-playground/sys/vm/vm_object.c Sat Mar 2 18:18:30 2013 (r247661)
@@ -166,8 +166,9 @@ vm_object_zdtor(void *mem, int size, voi
object = (vm_object_t)mem;
KASSERT(TAILQ_EMPTY(&object->memq),
- ("object %p has resident pages",
- object));
+ ("object %p has resident pages in its memq", object));
+ KASSERT(object->rtree.rt_root == 0,
+ ("object %p has resident pages in its trie", object));
#if VM_NRESERVLEVEL > 0
KASSERT(LIST_EMPTY(&object->rvq),
("object %p has reservations",
@@ -198,6 +199,7 @@ vm_object_zinit(void *mem, int size, int
mtx_init(&object->mtx, "vm object", NULL, MTX_DEF | MTX_DUPOK);
/* These are true for any object that has been freed */
+ object->rtree.rt_root = 0;
object->paging_in_progress = 0;
object->resident_page_count = 0;
object->shadow_count = 0;
@@ -211,7 +213,6 @@ _vm_object_allocate(objtype_t type, vm_p
TAILQ_INIT(&object->memq);
LIST_INIT(&object->shadow_head);
- object->rtree.rt_root = 0;
object->type = type;
switch (type) {
case OBJT_DEAD:
@@ -736,13 +737,14 @@ vm_object_terminate(vm_object_t object)
}
vm_page_unlock(p);
}
- vm_radix_reclaim_allnodes(&object->rtree);
+
/*
* If the object contained any pages, then reset it to an empty state.
* None of the object's fields, including "resident_page_count", were
* modified by the preceding loop.
*/
if (object->resident_page_count != 0) {
+ vm_radix_reclaim_allnodes(&object->rtree);
TAILQ_INIT(&object->memq);
object->resident_page_count = 0;
if (object->type == OBJT_VNODE)
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