Function vm_page_pqstate_commit_dequeue

freebsd/vm/vm_page.c:3416–3440

}

static bool
vm_page_pqstate_commit_dequeue(vm_page_t m, vm_page_astate_t *old,
    vm_page_astate_t new)
{
	struct vm_pagequeue *pq;
	vm_page_astate_t as;
	bool ret;

	pq = _vm_page_pagequeue(m, old->queue);

	/*
	 * The queue field and PGA_ENQUEUED flag are stable only so long as the
	 * corresponding page queue lock is held.
	 */
	vm_pagequeue_lock(pq);
	as = vm_page_astate_load(m);
	if (__predict_false(as._bits != old->_bits)) {
		*old = as;
		ret = false;
	} else {
		ret = _vm_page_pqstate_commit_dequeue(pq, m, old, new);
	}
	vm_pagequeue_unlock(pq);
	return (ret);
}

/*
 * Commit a queue state update that enqueues or requeues a page.