MariaDB [test]> show status like 'uptime';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Uptime        | 119   |
+---------------+-------+
1 row in set (0.00 sec)

MariaDB [test]> show processlist ;
+----+------+-----------------+------+---------+----------+-------+------------------+----------+
| Id | User | Host            | db   | Command | Time     | State | Info             | Progress |
+----+------+-----------------+------+---------+----------+-------+------------------+----------+
|  3 | root | localhost:47560 | test | Sleep   | 36680651 |       | NULL             |    0.000 |
|  4 | root | localhost:47561 | test | Query   |       94 | init  | show processlist |    0.000 |
+----+------+-----------------+------+---------+----------+-------+------------------+----------+
2 rows in set (0.00 sec)

MariaDB [test]> show processlist ;
+----+------+-----------------+------+---------+----------+-------+------------------+----------+
| Id | User | Host            | db   | Command | Time     | State | Info             | Progress |
+----+------+-----------------+------+---------+----------+-------+------------------+----------+
|  3 | root | localhost:47560 | test | Sleep   | 44551816 |       | NULL             |    0.000 |
|  4 | root | localhost:47561 | test | Query   |       78 | init  | show processlist |    0.000 |
+----+------+-----------------+------+---------+----------+-------+------------------+----------+
2 rows in set (0.00 sec)

commit 8f603bcbcac4a9091b6adbca3fd3655a947e759a 2bc6e29afeea374aa0ef4bc36c7a7b649c20d959
Author: Sergey Vojtovich <svoj@mariadb.org>
Date:   Wed Jun 17 18:55:38 2015 +0400

    MDEV-7952 - clock_gettime() takes 0.24% in OLTP RO
    
    Initialize abs_timeout when it is about to be used. This saves one my_hrtime()
    call on hot path (when we acquire MDL lock without waiting).
    
    When filling I_S.PROCESSLIST use THD::start_utime/THD::utime_after_query instead
    of THD::start_time. This allows us to save 2 clock_gettime() calls.
    
    Overhead change:
    __clock_gettime   0.13% -> 0.11% (122 -> 76 calls per OLTP RO transaction)
    my_interval_timer 0.07% -> 0.06%
    my_hrtime         0.04% -> 0.01%