posix_fadvise (bt->idx, page_no << bt->page_bits, bt->page_size, POSIX_FADV_WILLNEED);
__sync_fetch_and_add (&bt->latchmgr->cache[page->lvl], -1);
#else
posix_fadvise (bt->idx, page_no << bt->page_bits, bt->page_size, POSIX_FADV_WILLNEED);
__sync_fetch_and_add (&bt->latchmgr->cache[page->lvl], -1);
#else