buf_print
buf_print(bp, ": reclaim\n");
buf_print(bp, ": prune\n");
buf_print(bp, ": reclaim_l\n");
buf_print(bp, ": access\n");
buf_print(bp, ": new\n");
void buf_print(struct buf *, char *);
buf_print(bp, " ");
buf_print(bp, " ");