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

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Date:	Thu, 27 Oct 2011 21:18:24 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	schwidefsky@...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 Thu, Oct 27, 2011 at 8:45 PM, Dave Hansen <haveblue@...ibm.com> wrote:
> On Thu, 2011-10-27 at 09:30 +0200, Heiko Carstens wrote:
>> > Are any events generated for memory add?
>>
>> Looks like uevents are only genereted when memory gets registered and
>> unregistered, but not when when it gets set online or offline.
>> To achieve that you would need to add similar code to
>> store_mem_state()/memory_block_change_state() in drivers/base/memory.c
>> like we have it already in store_online() in drivers/base/cpu.c
>
> Instead of doing it at that low a level, perhaps we should be generating
> events when 'totalram_pages' changes.  That way, we'll also trigger
> events when things like ballooning happen.
>

I think we should separate the memory hot-plug issues from ballooning issues,
so probably we need another uevent for this...
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