Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::netdev.change_mtu - Called when the netdev MTU is changed
SYNOPSIS
netdev.change_mtu
VALUES
new_mtu
The new MTU
old_mtu
The current MTU
dev_name
The device that will have the MTU changed
SystemTap Tapset Reference March 2016 PROBE::NETDEV.CHAN(3stap)