linux-kernel - kdump: No udev events for memory hotplug?

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Date:	Wed, 26 Oct 2011 18:08:12 +0200
From:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: kdump: No udev events for memory hotplug?

Hello Vivek and Eric,

I noticed that on my system kernel 3.1 *no* udev events for memory
hotplug are generated. Same on my RHEL6.1.

# udevadm monitor
# echo offline > /sys/devices/system/memory/memory4/state

-> No event

But we need the udev events in order to do a kdump reload for setting up
the ELF loads correctly.

In my /etc/udev/rules.d/98-kexec.rules there are rules for memory
hotplug:

SUBSYSTEM=="memory", ACTION=="add", PROGRAM="/etc/init.d/kdump restart"
SUBSYSTEM=="memory", ACTION=="remove", PROGRAM="/etc/init.d/kdump
restart"

Perhaps/probably I am missing something?

Michael


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