Function vm_page_release

freebsd/vm/vm_page.c:4191–4216

* Unwire a page and either attempt to free it or re-add it to the page queues. */

 * Unwire a page and either attempt to free it or re-add it to the page queues.
 */
void
vm_page_release(vm_page_t m, int flags)
{
	vm_object_t object;

	KASSERT((m->oflags & VPO_UNMANAGED) == 0,
	    ("vm_page_release: page %p is unmanaged", m));

	if ((flags & VPR_TRYFREE) != 0) {
		for (;;) {
			object = atomic_load_ptr(&m->object);
			if (object == NULL)
				break;
			/* Depends on type-stability. */
			if (vm_page_busied(m) || !VM_OBJECT_TRYWLOCK(object))
				break;
			if (object == m->object) {
				vm_page_release_locked(m, flags);
				VM_OBJECT_WUNLOCK(object);
				return;
			}
			VM_OBJECT_WUNLOCK(object);
		}
	}
	vm_page_unwire_managed(m, PQ_INACTIVE, flags != 0);
}

/* See vm_page_release(). */
void