vm_domain_pageout_lockptr
vm_domain_pageout_lockptr(vmd), PDROP | PVM,
vm_domain_pageout_lockptr(vmd), PVM, "psleep", 0);
mtx_assert(vm_domain_pageout_lockptr((n)), MA_OWNED)
mtx_assert(vm_domain_pageout_lockptr((n)), MA_NOTOWNED)
mtx_lock(vm_domain_pageout_lockptr((d)))
mtx_unlock(vm_domain_pageout_lockptr((d)))