Added malloc_calls to SHOW GLOBAL STATUS for DEBUG server

sql/mysqld.cc

@@ -470,6 +470,7 @@ ulong aborted_threads, aborted_connects, aborted_connects_preauth;
 ulong delayed_insert_timeout, delayed_insert_limit, delayed_queue_size;
 ulong delayed_insert_threads, delayed_insert_writes, delayed_rows_in_use;
 ulong delayed_insert_errors,flush_time;
+ulong malloc_calls;
 ulong specialflag=0;
 ulong binlog_cache_use= 0, binlog_cache_disk_use= 0;
 ulong binlog_stmt_cache_use= 0, binlog_stmt_cache_disk_use= 0;
@@ -3606,6 +3607,10 @@ static void my_malloc_size_cb_func(long long size, my_bool is_thread_specific)
 {
   THD *thd= current_thd;
 
+#ifndef DBUG_OFF
+  statistic_increment(malloc_calls, &LOCK_status);
+#endif
+
   /*
     When thread specific is set, both mysqld_server_initialized and thd
     must be set, and we check that with DBUG_ASSERT.
@@ -7274,6 +7279,9 @@ SHOW_VAR status_vars[]= {
   {"Handler_write",            (char*) offsetof(STATUS_VAR, ha_write_count), SHOW_LONG_STATUS},
   {"Key",                      (char*) &show_default_keycache, SHOW_FUNC},
   {"Last_query_cost",          (char*) offsetof(STATUS_VAR, last_query_cost), SHOW_DOUBLE_STATUS},
+#ifndef DBUG_OFF
+  {"malloc_calls",             (char*) &malloc_calls, SHOW_LONG},
+#endif
   {"Max_statement_time_exceeded", (char*) offsetof(STATUS_VAR, max_statement_time_exceeded), SHOW_LONG_STATUS},
   {"Master_gtid_wait_count",   (char*) offsetof(STATUS_VAR, master_gtid_wait_count), SHOW_LONG_STATUS},
   {"Master_gtid_wait_timeouts", (char*) offsetof(STATUS_VAR, master_gtid_wait_timeouts), SHOW_LONG_STATUS},
@@ -7610,6 +7618,7 @@ static int mysql_init_variables(void)
   abort_loop= select_thread_in_use= signal_thread_in_use= 0;
   grant_option= 0;
   aborted_threads= aborted_connects= aborted_connects_preauth= 0;
+  malloc_calls= 0;
   subquery_cache_miss= subquery_cache_hit= 0;
   delayed_insert_threads= delayed_insert_writes= delayed_rows_in_use= 0;
   delayed_insert_errors= thread_created= 0;