^^&&^^

Edit File: modify.test

--source include/not_embedded.inc
--source suite/perfschema_stress/include/settings.inc

let $have_table= `SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES
                  WHERE TABLE_SCHEMA='test' AND TABLE_NAME='t1'`;

if (!$have_table) {
    --source suite/perfschema_stress/t/setup.test
}

UPDATE performance_schema.setup_instruments SET TIMED = 'NO';

UPDATE performance_schema.setup_instruments SET ENABLED = 'NO';

UPDATE performance_schema.setup_timers
SET TIMER_NAME = 'NANOSECOND' WHERE NAME = 'Wait';

# Let it run some time with the new timer name and instruments
--sleep 1

UPDATE performance_schema.setup_timers
SET TIMER_NAME = 'CYCLE' WHERE NAME = 'Wait';

UPDATE performance_schema.setup_instruments SET TIMED = 'YES';

UPDATE performance_schema.setup_instruments SET ENABLED = 'YES'
WHERE NAME IN ('wait/io/file/sql/FRM',
               'thread/sql/Connection',
               'wait/synch/cond/sql/COND_mdl',
               'wait/synch/rwlock/sql/LOCK_sys_init_connect',
               'wait/synch/mutex/sql/LOCK_mdl');

# Two short lived changes to see that switching does not lead
# to havoc.

UPDATE performance_schema.setup_consumers SET ENABLED = 'NO'
WHERE NAME = 'events_waits_history';

UPDATE performance_schema.setup_consumers SET ENABLED = 'YES'
WHERE NAME = 'events_waits_history';