Comment 11 for bug 608027

Tested on both PS 5.1 and PS 5.5 RPM builds on CentOS 6.3 64 bit. clock_gettime is used and CPU statistics are collected.

PS 5.5 :

mysql> select * from information_schema.user_statistics\G
*************************** 1. row ***************************
                  USER: root
     TOTAL_CONNECTIONS: 36
CONCURRENT_CONNECTIONS: 0
        CONNECTED_TIME: 1417
             BUSY_TIME: 843
              CPU_TIME: 89
        BYTES_RECEIVED: 36892209
            BYTES_SENT: 0
  BINLOG_BYTES_WRITTEN: 26470995
          ROWS_FETCHED: 8000828
          ROWS_UPDATED: 132874
       TABLE_ROWS_READ: 10727957
       SELECT_COMMANDS: 360206
       UPDATE_COMMANDS: 102888
        OTHER_COMMANDS: 51446
   COMMIT_TRANSACTIONS: 25727
 ROLLBACK_TRANSACTIONS: 0
    DENIED_CONNECTIONS: 0
      LOST_CONNECTIONS: 19
         ACCESS_DENIED: 0
         EMPTY_QUERIES: 0
 TOTAL_SSL_CONNECTIONS: 0
1 row in set (0.00 sec)

PS 5.1:

mysql> select * from information_schema.user_statistics\G
*************************** 1. row ***************************
                  USER: root
     TOTAL_CONNECTIONS: 29
CONCURRENT_CONNECTIONS: 0
        CONNECTED_TIME: 566
             BUSY_TIME: 389
              CPU_TIME: 48
        BYTES_RECEIVED: 10275334
            BYTES_SENT: 21120
  BINLOG_BYTES_WRITTEN: 12192166
          ROWS_FETCHED: 4035649
          ROWS_UPDATED: 110475
       TABLE_ROWS_READ: 6748195
       SELECT_COMMANDS: 3
       UPDATE_COMMANDS: 5
        OTHER_COMMANDS: 16113
   COMMIT_TRANSACTIONS: 16096
 ROLLBACK_TRANSACTIONS: 2
    DENIED_CONNECTIONS: 0
      LOST_CONNECTIONS: 24
         ACCESS_DENIED: 0
         EMPTY_QUERIES: 0
1 row in set (0.00 sec)

Also, tested with strace and gdb:

strace -f -e trace=clock_gettime -p 1698
Process 1698 attached with 19 threads - interrupt to quit
Process 8762 detached
Process 8827 attached
[pid 8827] clock_gettime(0x3 /* CLOCK_??? */, {0, 331874}) = 0
[pid 8827] clock_gettime(0x3 /* CLOCK_??? */, {0, 792574}) = 0
[pid 8827] clock_gettime(0x3 /* CLOCK_??? */, {0, 956722}) = 0
[pid 8827] clock_gettime(0x3 /* CLOCK_??? */, {0, 1228094}) = 0
[pid 8827] clock_gettime(0x3 /* CLOCK_??? */, {0, 17605198}) = 0
[pid 8827] clock_gettime(0x3 /* CLOCK_??? */, {0, 17878064}) = 0

GDB output: http://sprunge.us/ZBdj