Message-ID: <4C3349BF.7030104@austin.ibm.com>
Date: Tue, 06 Jul 2010 10:20:31 -0500
From: Nathan Fontenot <nfont@austin.ibm.com>
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To: Dave Hansen <dave@linux.vnet.ibm.com>
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Greg KH <gregkh@suse.de>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Andi Kleen <andi@firstfloor.org>, linux-kernel@vger.kernel.org,
       "Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH] memory hotplug disable boot option
References: <20100628154455.GA13918@suse.de>	 <1277769867.8354.531.camel@nimitz>	 <20100629115232.38BC.A69D9226@jp.fujitsu.com>	 <1277827384.8354.3413.camel@nimitz>	<20100629180415.GB1240@suse.de>	 <20100630093251.a30ed1e0.kamezawa.hiroyu@jp.fujitsu.com>	 <20100630154755.GB12158@suse.de>	 <20100701093130.c5e2b564.kamezawa.hiroyu@jp.fujitsu.com> <1277990595.8354.10356.camel@nimitz>
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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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