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Message-ID: <1319645292.3321.24.camel@br98xy6r>
Subject: kdump: No udev events for memory hotplug?
From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Reply-To: holzheu@linux.vnet.ibm.com
To: Vivek Goyal <vgoyal@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>, schwidefsky@de.ibm.com,
        heiko.carstens@de.ibm.com, kexec@lists.infradead.org,
        linux-kernel@vger.kernel.org
Date: Wed, 26 Oct 2011 18:08:12 +0200
Organization: IBM
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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