Attachment #237658 for bug #256507




	if (!unwired || (m->oflags & VPO_UNMANAGED) != 0 || m->object == NULL)
		return (unwired);

	/*
	 * A lazy dequeue might already be in progress.  Wait for it to finish
	 * before proceeding.
	 *
	 * Ensure that we load the queue index after the state flags, to
	 * synchronize with vm_page_dequeue_complete().
	 */
	if (__predict_false((m->aflags & PGA_DEQUEUE) != 0))
		vm_page_dequeue(m);
	atomic_thread_fence_acq();

	if (vm_page_queue(m) == queue) {
		if (queue == PQ_ACTIVE)
			vm_page_reference(m);

Return to bug 256507

Lines 3618-3623 vm_page_unwire(vm_page_t m, uint8_t queue) Link Here

(-)b/sys/vm/vm_page.c (+11 lines)
3618	if (!unwired \|\| (m->oflags & VPO_UNMANAGED) != 0 \|\| m->object == NULL)	3618	if (!unwired \|\| (m->oflags & VPO_UNMANAGED) != 0 \|\| m->object == NULL)
3619	return (unwired);	3619	return (unwired);
3620		3620
		3621	/*
		3622	* A lazy dequeue might already be in progress. Wait for it to finish
		3623	* before proceeding.
		3624	*
		3625	* Ensure that we load the queue index after the state flags, to
		3626	* synchronize with vm_page_dequeue_complete().
		3627	*/
		3628	if (__predict_false((m->aflags & PGA_DEQUEUE) != 0))
		3629	vm_page_dequeue(m);
		3630	atomic_thread_fence_acq();
		3631
3621	if (vm_page_queue(m) == queue) {	3632	if (vm_page_queue(m) == queue) {
3622	if (queue == PQ_ACTIVE)	3633	if (queue == PQ_ACTIVE)
3623	vm_page_reference(m);	3634	vm_page_reference(m);