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

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Message-ID: <1319719533.23600.55.camel@nimitz>
Date:	Thu, 27 Oct 2011 05:45:33 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	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, 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.

-- Dave

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