What is kdmflush?

Question

I've entered ps -aux and found this kdmflush process.

root       274  0.0  0.0      0     0 ?        S<   06:50   0:00 [kdmflush]
root       321  0.0  0.0      0     0 ?        S<   06:50   0:00 [kdmflush]
root       328  0.0  0.0      0     0 ?        S<   06:50   0:00 [kdmflush]
root       798  0.0  0.0      0     0 ?        S<   06:50   0:00 [kdmflush]

I can't find any documentation online relating to this process. Does anyone know what this process is?

Answer 1

It is a kernel thread.

kdmflush is used by Device Mapper to process deferred work that it has queued up from other contexts where doing immediately so would be problematic.

See line 1759.