Add eviction count for table cache lru cleanup (xtradb)

Author: ericherman

storage/xtradb/include/srv0mon.h

@@ -379,6 +379,7 @@ enum monitor_id_t {
 MONITOR_SRV_MEM_VALIDATE_MICROSECOND,
 MONITOR_SRV_PURGE_MICROSECOND,
 MONITOR_SRV_DICT_LRU_MICROSECOND,
+MONITOR_SRV_DICT_LRU_EVICT_COUNT,
 MONITOR_SRV_CHECKPOINT_MICROSECOND,
 MONITOR_OVLD_SRV_DBLWR_WRITES,
 MONITOR_OVLD_SRV_DBLWR_PAGES_WRITTEN,

storage/xtradb/srv/srv0mon.cc

@@ -1196,6 +1196,11 @@ static monitor_info_t	innodb_counter_info[] =
  MONITOR_NONE,
  MONITOR_DEFAULT_START, MONITOR_SRV_DICT_LRU_MICROSECOND},
 
+{"innodb_dict_lru_count", "server",
+ "Number of tables evicted from DICT LRU list",
+ MONITOR_NONE,
+ MONITOR_DEFAULT_START, MONITOR_SRV_DICT_LRU_EVICT_COUNT},
+
 {"innodb_checkpoint_usec", "server",
  "Time (in microseconds) spent by master thread to do checkpoint",
  MONITOR_NONE,

storage/xtradb/srv/srv0srv.cc

@@ -2881,6 +2881,7 @@ srv_master_do_active_tasks(void)
 {
 ib_time_tcur_time = ut_time();
 ullint	counter_time = ut_time_us(NULL);
+ulint	n_evicted = 0;
 
 /* First do the tasks that we are suppose to do at each
 invocation of this function. */
@@ -2941,7 +2942,9 @@ srv_master_do_active_tasks(void)
 
 if (cur_time % SRV_MASTER_DICT_LRU_INTERVAL == 0) {
 srv_main_thread_op_info = "enforcing dict cache limit";
-srv_master_evict_from_table_cache(50);
+n_evicted = srv_master_evict_from_table_cache(50);
+MONITOR_INC_VALUE(
+MONITOR_SRV_DICT_LRU_EVICT_COUNT, n_evicted);
 MONITOR_INC_TIME_IN_MICRO_SECS(
 MONITOR_SRV_DICT_LRU_MICROSECOND, counter_time);
 }