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From: Dave Hansen <haveblue@us.ibm.com>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	schwidefsky@de.ibm.com,
	Michael Holzheu <holzheu@linux.vnet.ibm.com>,
	Vivek Goyal <vgoyal@redhat.com>
Subject: Re: kdump: No udev events for memory hotplug?
Date: Thu, 27 Oct 2011 05:45:33 -0700	[thread overview]
Message-ID: <1319719533.23600.55.camel@nimitz> (raw)
In-Reply-To: <20111027073058.GA2422@osiris.boeblingen.de.ibm.com>

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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WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <haveblue@us.ibm.com>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>,
	Michael Holzheu <holzheu@linux.vnet.ibm.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	schwidefsky@de.ibm.com, kexec@lists.infradead.org,
	linux-kernel@vger.kernel.org, Kay Sievers <kay.sievers@vrfy.org>
Subject: Re: kdump: No udev events for memory hotplug?
Date: Thu, 27 Oct 2011 05:45:33 -0700	[thread overview]
Message-ID: <1319719533.23600.55.camel@nimitz> (raw)
In-Reply-To: <20111027073058.GA2422@osiris.boeblingen.de.ibm.com>

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


  parent reply	other threads:[~2011-10-27 12:46 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-26 16:08 kdump: No udev events for memory hotplug? Michael Holzheu
2011-10-26 16:08 ` Michael Holzheu
2011-10-26 19:24 ` Vivek Goyal
2011-10-26 19:24   ` Vivek Goyal
2011-10-27  7:30   ` Heiko Carstens
2011-10-27  7:30     ` Heiko Carstens
2011-10-27  9:32     ` [PATCH] kdump: Add udev events for memory online/offline Michael Holzheu
2011-10-27  9:32       ` Michael Holzheu
2011-10-28 22:41       ` Andrew Morton
2011-10-28 22:41         ` Andrew Morton
2011-10-28 22:57         ` Dave Hansen
2011-10-28 22:57           ` Dave Hansen
2011-10-28 22:46       ` Andrew Morton
2011-10-28 22:46         ` Andrew Morton
2011-10-31 13:21         ` [PATCH v2] " Michael Holzheu
2011-10-31 13:21           ` Michael Holzheu
2011-11-14  2:37           ` WANG Cong
2011-10-27 12:45     ` Dave Hansen [this message]
2011-10-27 12:45       ` kdump: No udev events for memory hotplug? Dave Hansen
2011-10-27 13:18       ` Américo Wang
2011-10-27 13:18         ` Américo Wang
2011-10-27  7:45 ` Américo Wang
2011-10-27  7:45   ` Américo Wang

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