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

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Message-ID: <20111026192449.GE355@redhat.com>
Date:	Wed, 26 Oct 2011 15:24:49 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: kdump: No udev events for memory hotplug?

On Wed, Oct 26, 2011 at 06:08:12PM +0200, Michael Holzheu wrote:
> 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?

I don't know. Sounds like a bug. I have never looked into it. CCing Kay,
if he has any thoughts.

Are any events generated for memory add?

Thanks
Vivek
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