This is based on the userstatv2 patch from Percona and OurDelta.

The original code comes, as far as I know, from Google (Mark Callaghan's team) with additional work from Percona, Ourdelta and Weldon Whipple.

This code provides the same functionallity, but with a lot of changes to make it faster and better fit the MariaDB infrastucture.

Added new status variables:
- Com_show_client_statistics, Com_show_index_statistics, Com_show_table_statistics, Com_show_user_statistics
- Access_denied_errors, Busy_time (clock time), Binlog_bytes_written, Cpu_time, Empty_queries, Rows_sent, Rows_read

Added new variable / startup option 'userstat' to control if user statistics should be enabled or not

Added my_getcputime(); Returns cpu time used by this thread.
New FLUSH commands:
- FLUSH SLOW QUERY LOG
- FLUSH TABLE_STATISTICS
- FLUSH INDEX_STATISTICS
- FLUSH USER_STATISTICS
- FLUSH CLIENT_STATISTICS

New SHOW commands:
- SHOW CLIENT_STATISTICS
- SHOW USER_STATISTICS
- SHOW TABLE_STATISTICS
- SHOW INDEX_STATISTICS

New Information schemas:
- CLIENT_STATISTICS
- USER_STATISTICS
- INDEX_STATISTICS
- TABLE_STATISTICS

Added support for all new flush commands to mysqladmin

Added handler::ha_... wrappers for all handler read calls to do statistics counting
- Changed all code to use new ha_... calls
- Count number of read rows, changed rows and rows read trough an index

Added counting of number of bytes sent to binary log (status variable Binlog_bytes_written)
Added counting of access denied errors (status variable Access_denied_erors)

Bugs fixed:
- Fixed bug in add_to_status() and add_diff_to_status() where longlong variables where threated as long
- CLOCK_GETTIME was not propely working on Linuxm

client/mysqladmin.cc:
  Added support for all new flush commmands and some common combinations:
  
  flush-slow-log
  flush-table-statistics
  flush-index-statistics
  flush-user-statistics
  flush-client-statistics
  flush-all-status
  flush-all-statistics
configure.in:
  Added checking if clock_gettime needs the librt.
  (Fixes Bug #37639 clock_gettime is never used/enabled in Linux/Unix)
include/my_sys.h:
  Added my_getcputime()
include/mysql_com.h:
  Added LIST_PROCESS_HOST_LEN & new REFRESH target defines
mysql-test/r/information_schema.result:
  New information schema tables added
mysql-test/r/information_schema_all_engines.result:
  New information schema tables added
mysql-test/r/information_schema_db.result:
  New information schema tables added
mysql-test/r/log_slow.result:
  Added testing that flosh slow query logs is accepted
mysql-test/r/status_user.result:
  Basic testing of user, client, table and index statistics
mysql-test/t/log_slow.test:
  Added testing that flosh slow query logs is accepted
mysql-test/t/status_user-master.opt:
  Ensure that we get a fresh restart before running status_user.test
mysql-test/t/status_user.test:
  Basic testing of user, client, table and index statistics
mysys/my_getsystime.c:
  Added my_getcputime()
  Returns cpu time used by this thread.
sql/authors.h:
  Updated authors to have core and original MySQL developers first.
sql/event_data_objects.cc:
  Updated call to mysql_reset_thd_for_next_command()
sql/event_db_repository.cc:
  Changed to use new ha_... calls
sql/filesort.cc:
  Changed to use new ha_... calls
sql/ha_partition.cc:
  Changed to use new ha_... calls
  Fixed comment syntax
sql/handler.cc:
  Changed to use new ha_... calls
  Reset table statistics
  Added code to update global table and index status
  Added counting of rows changed
sql/handler.h:
  Added table and index statistics variables
  Added function reset_statistics()
  Added handler::ha_... wrappers for all handler read calls to do statistics counting
  Protected all normal read calls to ensure we use the new calls in the server.
  Made ha_partition a friend class so that partition code can call the old read functions
sql/item_subselect.cc:
  Changed to use new ha_... calls
sql/lex.h:
  Added keywords for new information schema tables and flush commands
sql/log.cc:
  Added flush_slow_log()
  Added counting of number of bytes sent to binary log
  Removed not needed test of thd (It's used before, so it's safe to use)
  Added THD object to MYSQL_BIN_LOG::write_cache() to simplify statistics counting
sql/log.h:
  Added new parameter to write_cache()
  Added flush_slow_log() functions.
sql/log_event.cc:
  Updated call to mysql_reset_thd_for_next_command()
  Changed to use new ha_... calls
sql/log_event_old.cc:
  Updated call to mysql_reset_thd_for_next_command()
  Changed to use new ha_... calls
sql/mysql_priv.h:
  Updated call to mysql_reset_thd_for_next_command()
  Added new statistics functions and variables needed by these.
sql/mysqld.cc:
  Added new statistics variables and structures to handle these
  Added new status variables:
  - Com_show_client_statistics, Com_show_index_statistics, Com_show_table_statistics, Com_show_user_statistics
  - Access_denied_errors, Busy_time (clock time), Binlog_bytes_written, Cpu_time, Empty_queries, Rows_set, Rows_read
  Added new option 'userstat' to control if user statistics should be enabled or not
sql/opt_range.cc:
  Changed to use new ha_... calls
sql/opt_range.h:
  Changed to use new ha_... calls
sql/opt_sum.cc:
  Changed to use new ha_... calls
sql/records.cc:
  Changed to use new ha_... calls
sql/set_var.cc:
  Added variable 'userstat'
sql/sp.cc:
  Changed to use new ha_... calls
sql/sql_acl.cc:
  Changed to use new ha_... calls
  Added counting of access_denied_errors
sql/sql_base.cc:
  Added call to statistics functions
sql/sql_class.cc:
  Added usage of org_status_var, to store status variables at start of command
  Added functions THD::update_stats(), THD::update_all_stats()
  Fixed bug in add_to_status() and add_diff_to_status() where longlong variables where threated as long
sql/sql_class.h:
  Added new status variables to status_var
  Moved variables that was not ulong in status_var last.
  Added variables to THD for storing temporary values during statistics counting
sql/sql_connect.cc:
  Variables and functions to calculate user and client statistics
  Added counting of access_denied_errors and lost_connections
sql/sql_cursor.cc:
  Changed to use new ha_... calls
sql/sql_handler.cc:
  Changed to use new ha_... calls
sql/sql_help.cc:
  Changed to use new ha_... calls
sql/sql_insert.cc:
  Changed to use new ha_... calls
sql/sql_lex.h:
  Added SQLCOM_SHOW_USER_STATS, SQLCOM_SHOW_TABLE_STATS, SQLCOM_SHOW_INDEX_STATS, SQLCOM_SHOW_CLIENT_STATS
sql/sql_parse.cc:
  Added handling of:
  - SHOW CLIENT_STATISTICS
  - SHOW USER_STATISTICS
  - SHOW TABLE_STATISTICS
  - SHOW INDEX_STATISTICS
  Added handling of new FLUSH commands:
  - FLUSH SLOW QUERY LOGS
  - FLUSH TABLE_STATISTICS
  - FLUSH INDEX_STATISTICS
  - FLUSH USER_STATISTICS
  - FLUSH CLIENT_STATISTICS
  Added THD parameter to mysql_reset_thd_for_next_command()
  Added initialization and calls to user statistics functions
  Added increment of statistics variables empty_queries, rows_sent and access_denied_errors.
  Added counting of cpu time per query
sql/sql_plugin.cc:
  Changed to use new ha_... calls
sql/sql_prepare.cc:
  Updated call to mysql_reset_thd_for_next_command()
sql/sql_select.cc:
  Changed to use new ha_... calls
  Indentation changes
sql/sql_servers.cc:
  Changed to use new ha_... calls
sql/sql_show.cc:
  Added counting of access denied errors
  Added function for new information schema tables:
  - CLIENT_STATISTICS
  - USER_STATISTICS
  - INDEX_STATISTICS
  - TABLE_STATISTICS
  Changed to use new ha_... calls
sql/sql_table.cc:
  Changed to use new ha_... calls
sql/sql_udf.cc:
  Changed to use new ha_... calls
sql/sql_update.cc:
  Changed to use new ha_... calls
sql/sql_yacc.yy:
  Add new show and flush commands
sql/structs.h:
  Add name_length to KEY to avoid some strlen
  Added cache_name to KEY for fast storage of keyvalue in cache
  Added structs USER_STATS, TABLE_STATS, INDEX_STATS
  Added function prototypes for statistics functions
sql/table.cc:
  Store db+table+index name into keyinfo->cache_name
sql/table.h:
  Added new information schema tables
sql/tztime.cc:
  Changed to use new ha_... calls

mysql-test/r/information_schema_all_engines.result

@@ -2,6 +2,7 @@ use INFORMATION_SCHEMA;
 show tables;
 Tables_in_information_schema
 CHARACTER_SETS
+CLIENT_STATISTICS
 COLLATIONS
 COLLATION_CHARACTER_SET_APPLICABILITY
 COLUMNS
@@ -11,6 +12,7 @@ EVENTS
 FILES
 GLOBAL_STATUS
 GLOBAL_VARIABLES
+INDEX_STATISTICS
 KEY_COLUMN_USAGE
 PARTITIONS
 PLUGINS
@@ -26,8 +28,10 @@ STATISTICS
 TABLES
 TABLE_CONSTRAINTS
 TABLE_PRIVILEGES
+TABLE_STATISTICS
 TRIGGERS
 USER_PRIVILEGES
+USER_STATISTICS
 VIEWS
 INNODB_BUFFER_POOL_PAGES
 PBXT_STATISTICS
@@ -60,6 +64,7 @@ c2.column_name LIKE '%SCHEMA%'
         );
 table_name	column_name
 CHARACTER_SETS	CHARACTER_SET_NAME
+CLIENT_STATISTICS	CLIENT
 COLLATIONS	COLLATION_NAME
 COLLATION_CHARACTER_SET_APPLICABILITY	COLLATION_NAME
 COLUMNS	TABLE_SCHEMA
@@ -69,6 +74,7 @@ EVENTS	EVENT_SCHEMA
 FILES	TABLE_SCHEMA
 GLOBAL_STATUS	VARIABLE_NAME
 GLOBAL_VARIABLES	VARIABLE_NAME
+INDEX_STATISTICS	TABLE_SCHEMA
 KEY_COLUMN_USAGE	CONSTRAINT_SCHEMA
 PARTITIONS	TABLE_SCHEMA
 PLUGINS	PLUGIN_NAME
@@ -84,8 +90,10 @@ STATISTICS	TABLE_SCHEMA
 TABLES	TABLE_SCHEMA
 TABLE_CONSTRAINTS	CONSTRAINT_SCHEMA
 TABLE_PRIVILEGES	TABLE_SCHEMA
+TABLE_STATISTICS	TABLE_SCHEMA
 TRIGGERS	TRIGGER_SCHEMA
 USER_PRIVILEGES	GRANTEE
+USER_STATISTICS	USER
 VIEWS	TABLE_SCHEMA
 INNODB_BUFFER_POOL_PAGES	page_type
 PBXT_STATISTICS	ID
@@ -118,6 +126,7 @@ c2.column_name LIKE '%SCHEMA%'
         );
 table_name	column_name
 CHARACTER_SETS	CHARACTER_SET_NAME
+CLIENT_STATISTICS	CLIENT
 COLLATIONS	COLLATION_NAME
 COLLATION_CHARACTER_SET_APPLICABILITY	COLLATION_NAME
 COLUMNS	TABLE_SCHEMA
@@ -127,6 +136,7 @@ EVENTS	EVENT_SCHEMA
 FILES	TABLE_SCHEMA
 GLOBAL_STATUS	VARIABLE_NAME
 GLOBAL_VARIABLES	VARIABLE_NAME
+INDEX_STATISTICS	TABLE_SCHEMA
 KEY_COLUMN_USAGE	CONSTRAINT_SCHEMA
 PARTITIONS	TABLE_SCHEMA
 PLUGINS	PLUGIN_NAME
@@ -142,8 +152,10 @@ STATISTICS	TABLE_SCHEMA
 TABLES	TABLE_SCHEMA
 TABLE_CONSTRAINTS	CONSTRAINT_SCHEMA
 TABLE_PRIVILEGES	TABLE_SCHEMA
+TABLE_STATISTICS	TABLE_SCHEMA
 TRIGGERS	TRIGGER_SCHEMA
 USER_PRIVILEGES	GRANTEE
+USER_STATISTICS	USER
 VIEWS	TABLE_SCHEMA
 INNODB_BUFFER_POOL_PAGES	page_type
 PBXT_STATISTICS	ID
@@ -182,6 +194,7 @@ group by c2.column_type order by num limit 1)
 group by t.table_name order by num1, t.table_name;
 table_name	group_concat(t.table_schema, '.', t.table_name)	num1
 CHARACTER_SETS	information_schema.CHARACTER_SETS	1
+CLIENT_STATISTICS	information_schema.CLIENT_STATISTICS	1
 COLLATIONS	information_schema.COLLATIONS	1
 COLLATION_CHARACTER_SET_APPLICABILITY	information_schema.COLLATION_CHARACTER_SET_APPLICABILITY	1
 COLUMNS	information_schema.COLUMNS	1
@@ -191,6 +204,7 @@ EVENTS	information_schema.EVENTS	1
 FILES	information_schema.FILES	1
 GLOBAL_STATUS	information_schema.GLOBAL_STATUS	1
 GLOBAL_VARIABLES	information_schema.GLOBAL_VARIABLES	1
+INDEX_STATISTICS	information_schema.INDEX_STATISTICS	1
 INNODB_BUFFER_POOL_PAGES	information_schema.INNODB_BUFFER_POOL_PAGES	1
 INNODB_BUFFER_POOL_PAGES_BLOB	information_schema.INNODB_BUFFER_POOL_PAGES_BLOB	1
 INNODB_BUFFER_POOL_PAGES_INDEX	information_schema.INNODB_BUFFER_POOL_PAGES_INDEX	1
@@ -220,8 +234,10 @@ STATISTICS	information_schema.STATISTICS	1
 TABLES	information_schema.TABLES	1
 TABLE_CONSTRAINTS	information_schema.TABLE_CONSTRAINTS	1
 TABLE_PRIVILEGES	information_schema.TABLE_PRIVILEGES	1
+TABLE_STATISTICS	information_schema.TABLE_STATISTICS	1
 TRIGGERS	information_schema.TRIGGERS	1
 USER_PRIVILEGES	information_schema.USER_PRIVILEGES	1
+USER_STATISTICS	information_schema.USER_STATISTICS	1
 VIEWS	information_schema.VIEWS	1
 XTRADB_ENHANCEMENTS	information_schema.XTRADB_ENHANCEMENTS	1
 Database: information_schema
@@ -229,6 +245,7 @@ Database: information_schema
 |                Tables                 |
 +---------------------------------------+
 | CHARACTER_SETS                        |
+| CLIENT_STATISTICS                     |
 | COLLATIONS                            |
 | COLLATION_CHARACTER_SET_APPLICABILITY |
 | COLUMNS                               |
@@ -238,6 +255,7 @@ Database: information_schema
 | FILES                                 |
 | GLOBAL_STATUS                         |
 | GLOBAL_VARIABLES                      |
+| INDEX_STATISTICS                      |
 | KEY_COLUMN_USAGE                      |
 | PARTITIONS                            |
 | PLUGINS                               |
@@ -253,8 +271,10 @@ Database: information_schema
 | TABLES                                |
 | TABLE_CONSTRAINTS                     |
 | TABLE_PRIVILEGES                      |
+| TABLE_STATISTICS                      |
 | TRIGGERS                              |
 | USER_PRIVILEGES                       |
+| USER_STATISTICS                       |
 | VIEWS                                 |
 | INNODB_BUFFER_POOL_PAGES              |
 | PBXT_STATISTICS                       |
@@ -277,6 +297,7 @@ Database: INFORMATION_SCHEMA
 |                Tables                 |
 +---------------------------------------+
 | CHARACTER_SETS                        |
+| CLIENT_STATISTICS                     |
 | COLLATIONS                            |
 | COLLATION_CHARACTER_SET_APPLICABILITY |
 | COLUMNS                               |
@@ -286,6 +307,7 @@ Database: INFORMATION_SCHEMA
 | FILES                                 |
 | GLOBAL_STATUS                         |
 | GLOBAL_VARIABLES                      |
+| INDEX_STATISTICS                      |
 | KEY_COLUMN_USAGE                      |
 | PARTITIONS                            |
 | PLUGINS                               |
@@ -301,8 +323,10 @@ Database: INFORMATION_SCHEMA
 | TABLES                                |
 | TABLE_CONSTRAINTS                     |
 | TABLE_PRIVILEGES                      |
+| TABLE_STATISTICS                      |
 | TRIGGERS                              |
 | USER_PRIVILEGES                       |
+| USER_STATISTICS                       |
 | VIEWS                                 |
 | INNODB_BUFFER_POOL_PAGES              |
 | PBXT_STATISTICS                       |
@@ -328,5 +352,5 @@ Wildcard: inf_rmation_schema
 +--------------------+
 SELECT table_schema, count(*) FROM information_schema.TABLES WHERE table_schema IN ('mysql', 'INFORMATION_SCHEMA', 'test', 'mysqltest') AND table_name<>'ndb_binlog_index' AND table_name<>'ndb_apply_status' GROUP BY TABLE_SCHEMA;
 table_schema	count(*)
-information_schema	43
+information_schema	47
 mysql	22