Removed purge_trx_id_age and purge_view_trx_id_age

These were unused status variables available in debug builds only.
Also removed trx_sys.rw_max_trx_id: not used anymore.

storage/innobase/handler/ha_innodb.cc

@@ -1048,10 +1048,6 @@ static SHOW_VAR innodb_status_variables[]= {
   {"available_undo_logs",
   (char*) &export_vars.innodb_available_undo_logs,        SHOW_LONG},
 #ifdef UNIV_DEBUG
-  {"purge_trx_id_age",
-  (char*) &export_vars.innodb_purge_trx_id_age,           SHOW_LONG},
-  {"purge_view_trx_id_age",
-  (char*) &export_vars.innodb_purge_view_trx_id_age,      SHOW_LONG},
   {"ahi_drop_lookups",
   (char*) &export_vars.innodb_ahi_drop_lookups,           SHOW_LONG},
 #endif /* UNIV_DEBUG */

storage/innobase/include/srv0srv.h

@@ -1018,9 +1018,6 @@ struct export_var_t{
 	ulint innodb_onlineddl_pct_progress;	/*!< Online alter progress */
 
 #ifdef UNIV_DEBUG
-	ulint innodb_purge_trx_id_age;		/*!< rw_max_trx_id - purged trx_id */
-	ulint innodb_purge_view_trx_id_age;	/*!< rw_max_trx_id
-						- purged view's min trx_id */
 	ulint innodb_ahi_drop_lookups;		/*!< number of adaptive hash
 						index lookups when freeing
 						file pages */

storage/innobase/include/trx0sys.h

@@ -835,10 +835,6 @@ struct trx_sys_t {
 	trx_ut_list_t	serialisation_list;
 					/*!< Ordered on trx_t::no of all the
 					currenrtly active RW transactions */
-#ifdef UNIV_DEBUG
-	trx_id_t	rw_max_trx_id;	/*!< Max trx id of read-write
-					transactions which exist or existed */
-#endif /* UNIV_DEBUG */
 
 	MY_ALIGNED(CACHE_LINE_SIZE)
 	trx_ut_list_t	mysql_trx_list;	/*!< List of transactions created

storage/innobase/srv/srv0srv.cc

@@ -1632,32 +1632,6 @@ srv_export_innodb_status(void)
 	export_vars.innodb_onlineddl_rowlog_pct_used = onlineddl_rowlog_pct_used;
 	export_vars.innodb_onlineddl_pct_progress = onlineddl_pct_progress;
 
-#ifdef UNIV_DEBUG
-	rw_lock_s_lock(&purge_sys->latch);
-	trx_id_t	up_limit_id	= purge_sys->view.up_limit_id();;
-	trx_id_t	done_trx_no	= purge_sys->done.trx_no;
-	rw_lock_s_unlock(&purge_sys->latch);
-
-	mutex_enter(&trx_sys.mutex);
-	trx_id_t	max_trx_id	= trx_sys.rw_max_trx_id;
-	mutex_exit(&trx_sys.mutex);
-
-	if (!done_trx_no || max_trx_id < done_trx_no - 1) {
-		export_vars.innodb_purge_trx_id_age = 0;
-	} else {
-		export_vars.innodb_purge_trx_id_age =
-			(ulint) (max_trx_id - done_trx_no + 1);
-	}
-
-	if (!up_limit_id
-	    || max_trx_id < up_limit_id) {
-		export_vars.innodb_purge_view_trx_id_age = 0;
-	} else {
-		export_vars.innodb_purge_view_trx_id_age =
-			(ulint) (max_trx_id - up_limit_id);
-	}
-#endif /* UNIV_DEBUG */
-
 	export_vars.innodb_sec_rec_cluster_reads =
 		srv_stats.n_sec_rec_cluster_reads;
 	export_vars.innodb_sec_rec_cluster_reads_avoided =

storage/innobase/trx/trx0sys.cc

@@ -440,7 +440,6 @@ trx_sys_init_at_db_start()
 				     TRX_SYS_TRX_ID_WRITE_MARGIN));
 
 	mtr.commit();
-	ut_d(trx_sys.rw_max_trx_id = trx_sys.get_max_trx_id());
 
 	trx_dummy_sess = sess_open();
 

storage/innobase/trx/trx0trx.cc

@@ -881,10 +881,6 @@ static void trx_resurrect(trx_undo_t *undo, trx_rseg_t *rseg,
   trx_resurrect_table_locks(trx, undo);
   if (trx_state_eq(trx, TRX_STATE_ACTIVE))
     *rows_to_undo+= trx->undo_no;
-#ifdef UNIV_DEBUG
-  if (trx->id > trx_sys.rw_max_trx_id)
-    trx_sys.rw_max_trx_id= trx->id;
-#endif
 }
 
 
@@ -1188,12 +1184,6 @@ trx_start_low(
 		      || srv_read_only_mode
 		      || srv_force_recovery >= SRV_FORCE_NO_TRX_UNDO);
 
-#ifdef UNIV_DEBUG
-		if (trx->id > trx_sys.rw_max_trx_id) {
-			trx_sys.rw_max_trx_id = trx->id;
-		}
-#endif /* UNIV_DEBUG */
-
 		mutex_exit(&trx_sys.mutex);
 		trx_sys.rw_trx_hash.insert(trx);
 
@@ -2776,12 +2766,6 @@ trx_set_rw_mode(
 	if (MVCC::is_view_active(trx->read_view)) {
 		MVCC::set_view_creator_trx_id(trx->read_view, trx->id);
 	}
-
-#ifdef UNIV_DEBUG
-	if (trx->id > trx_sys.rw_max_trx_id) {
-		trx_sys.rw_max_trx_id = trx->id;
-	}
-#endif /* UNIV_DEBUG */
 	mutex_exit(&trx_sys.mutex);
 	trx_sys.rw_trx_hash.insert(trx);
 }