page_reclaim
int page_reclaim(page_t *, kmutex_t *);
if (!page_reclaim(pp, lock)) {
if (!page_reclaim(pp, NULL)) {
if (!page_reclaim(pp, NULL)) {
if (!page_reclaim(pp, NULL)) {
if (!page_reclaim(pp, (kmutex_t *)NULL))
(void) page_reclaim(pp, NULL);