What are udev events?
Udev rules determine how to identify devices and how to assign a name that is persistent through reboots or disk changes. When Udev receives a device event, it matches the configured rules against the device attributes in sysfs to identify the device.
Are Rdma modules loaded?
The RDMA subsystem relies on the kernel, udev and systemd to load modules on demand when RDMA hardware is present. The RDMA subsystem is unique since it does not load the optional RDMA hardware modules unless the system has the rdma-core package installed.
What are udev rules?
udev allows for rules that specify what name is given to a device, regardless of which port it is plugged into. For example, a rule to always mount a hard drive with manufacturer “iRiver” and device code “ABC” as /dev/iriver is possible.
How to use udev for device event management?
Kernel Device Event Management 1 When bootup is initialized, the /dev directory is mounted in tmpfs. 2 After that, Udev will copy the static device nodes from  /lib/udev/devices  to the /dev directory. 3 The Udev daemon then runs and collects uevents from the kernel, for all the devices connected to the system.
What is udev and what does it do?
Udev is a remarkable device manager that provides a dynamic way of setting up device nodes in the /dev directory. It ensures that devices are configured as soon as they are plugged in and discovered. It propagates information about a processed device or changes to its state, to user space.
How to display received kernel events in udev?
To display received kernel events ( uevents) and udev events (which udev sends out after rule processing), run udevadm with the monitor command. Then connect a device to your system and watch, from the terminal, how the device event is handled.
How does udevadm control the runtime behavior of udev?
Description. udevadm expects a command and command specific options. It controls the runtime behavior of udev, requests kernel events, manages the event queue, and provides simple debugging mechanisms.