During debugging of another problem issues were noted with the kdump udev
rules. The kdump service is restarted on memory add and remove events.
These are the wrong events for these types of devices and result in an overly
aggressive restarting of the kdump service.
There are four udev events to consider, "add", "remove", "online", and
"offline". The remove event is a complete removal from the system -- neither
the hardware nor the kernel know about the hardware; it has been physically
removed. The add event is associated with hardware being physically added to
the system. The kernel has some limited knowledge of the device, however,
it is not avaiable for the kernel to use until it is brought online. Online
events refer to the device being available for the kernel to use. Opposite
to that is the offline event, which occurs when a device is no longer in
use by the kernel.
Note that in all four events the kernel *may* have some remaining information
stored about the device.
In the case of memory hotplug, kdump should be restarted when a memory module
is onlined or offlined. This is because the memory is not in use by the
kernel until the memory is onlined, and it is unused when the memory is
offlined.
Making these modifications results in smooth service on systems that do
heavy memory onlining and offlining.
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Resolves: bz808817
use systemctl try-restart kdump.service instead of old /etc/init.d/kdump restart
systemctl try-restart will restart kdump service only if the kdump service is runing. Original behavior is wrong when user does not chkconfig on the service.
Tested the cpu online/offline events.
Signed-off-by: Dave Young <dyoung@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
