why are there so many kdmflush processes running on the server?

Issue

• Too many kdmflush processes.
• What is the purpose of the kdmflush process?
• Are kdmflush process causing a performance issue?

For example:

# ps aux | grep kdmflush
root     16090  0.0  0.0      0     0 ?        S    06:24   0:00 [kdmflush]
root     16104  0.0  0.0      0     0 ?        S    06:24   0:00 [kdmflush]
root     16119  0.0  0.0      0     0 ?        S    06:24   0:00 [kdmflush]
root     16142  0.0  0.0      0     0 ?        S    06:24   0:00 [kdmflush]
root     16147  0.0  0.0      0     0 ?        S    06:24   0:00 [kdmflush]
root     16157  0.0  0.0      0     0 ?        S    06:24   0:00 [kdmflush]
root     16176  0.0  0.0      0     0 ?        S    06:24   0:00 [kdmflush]
root     16199  0.0  0.0      0     0 ?        S    06:24   0:00 [kdmflush]
[...]