linux-kernel - Re: [PATCH 4/6] Have x86_64 use add_active_range() and free_area_init

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Date:	Fri, 01 Sep 2006 11:46:46 +0300
From:	Mika Penttilä <mika.penttila@...umbus.fi>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Keith Mannthey <kmannth@...il.com>, akpm@...l.org,
	tony.luck@...el.com,
	Linux Memory Management List <linux-mm@...ck.org>,
	ak@...e.de, bob.picco@...com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 4/6] Have x86_64 use add_active_range() and free_area_init_nodes


>
> Right, it's all very clear now. At some point in the future, I'd like 
> to visit why SPARSEMEM-based hot-add is not always used but it's a 
> separate issue.
>
>> The add areas
>> are marked as RESERVED during boot and then later onlined during add.
>
> That explains the reserve_bootmem_node()
>
But pages are marked reserved by default. You still have to alloc the 
bootmem map for the the whole node range, including reserve hot add 
areas and areas beyond e820-end-of-ram. So all the areas are already 
reserved, until freed.

--Mika

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