This is patch is port from Goolge patches V2.

Patch depends on [[ patches:innodb_fsync_source ]] and [[ patches:innodb_io_tune ]]

Patch adds configuration variable
  * **innodb_status_update_interval** (default **30**), this is minimal interval when InnoDB updates counters shown in SHOW [GLOBAL] STATUS command.

Patch adds next status variables into SHOW STATUS output (sample output):
| Innodb_dict_size                  | 86832      | 
| Innodb_long_lock_wait             | OFF        | 
| Innodb_long_lock_waits            | 0          | 
| Innodb_os_read_requests           | 255        | 
| Innodb_os_write_requests          | 618        | 
| Innodb_os_pages_read              | 15441      | 
| Innodb_os_pages_written           | 29564      | 
| Innodb_os_read_time               | 25826437   | 
| Innodb_os_write_time              | 24080782   | 
| Innodb_time_per_read              | 101280     | 
| Innodb_time_per_write             | 38965      | 
| Innodb_deadlocks                  | 0          | 
| Innodb_transaction_count          | 49921      | 
| Innodb_transaction_purge_count    | 49536      | 
| Innodb_transaction_purge_lag      | 5          | 
| Innodb_active_transactions        | 0          | 
| Innodb_summed_transaction_age     | 0          | 
| Innodb_longest_transaction_age    | 0          | 
| Innodb_lock_wait_timeouts         | 0          | 
| Innodb_lock_waiters               | 0          | 
| Innodb_summed_lock_wait_time      | 0          | 
| Innodb_longest_lock_wait          | 0          | 
| Innodb_pending_normal_aio_reads   | 0          | 
| Innodb_pending_normal_aio_writes  | 0          | 
| Innodb_pending_ibuf_aio_reads     | 0          | 
| Innodb_pending_log_ios            | 0          | 
| Innodb_pending_sync_ios           | 0          | 
| Innodb_os_reads                   | 537        | 
| Innodb_os_writes                  | 1726       | 
| Innodb_os_fsyncs                  | 1024       | 
| Innodb_ibuf_inserts               | 1          | 
| Innodb_ibuf_size                  | 120        | 
| Innodb_ibuf_merged_recs           | 120        | 
| Innodb_ibuf_merges                | 1          | 
| Innodb_log_ios_done               | 390        | 


And information about main innodb thread in SHOW INNODB STATUS, BACKGROUND THREAD section

<code>
----------
BACKGROUND THREAD
----------
srv_master_thread loops: 0 1_second, 0 sleeps, 12 10_second, 79 background, 79 flush
srv_master_thread log flush: 122 sync, 124 async
</code>