linux-kernel - Re: [PATCH] memory hotplug disable boot option

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Message-ID: <4C3349BF.7030104@austin.ibm.com>
Date:	Tue, 06 Jul 2010 10:20:31 -0500
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Greg KH <gregkh@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] memory hotplug disable boot option

On 07/01/2010 08:23 AM, Dave Hansen wrote:
> 
> I was thinking more along the lines of just taking adjacent sections and
> merging them.  We'll need a new "end address" or size file.  Maybe
> "end_phys_index" or something similar.
> 
> Such a beast would not fix all of the pathological cases, like where
> only every other 16MB section is populated with RAM, but I don't think
> those are very common at all, especially in cases where there's a lot of
> RAM.  But, it also has a chance of being relatively backward-compatible.
> In most cases, we may even be able to calculate a new phys_block_size
> where everything fits evenly and be fully backward-compatible with the
> old ABI.
> 

Under this scenario were you thinking that all of the memory sections that
reside under this memory block would then be acted upon as a whole.  For
example would we allow users to hotplug individual memory sections included
in th block, or would the memory block be acted upon as a whole?

-Nathan
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