linux-kernel - [Question] How to represent SYSTEM

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Message-Id: <20071003103136.addbe839.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 3 Oct 2007 10:31:36 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	andi@...stfloor.org, "linux-mm@...ck.org" <linux-mm@...ck.org>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>, pbadari@...ibm.com,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>
Subject: [Question] How to represent SYSTEM_RAM in kerenel/resouce.c

Hi,

Now, SYSTEM_RAM is registerd to resouce list and a user can see memory map
from /proc/iomem, like following.
==
[kamezawa@...q linux-2.6.23-rc8-mm2]$ grep RAM /proc/iomem
00000000-0009ffff : System RAM
00100000-03ffffff : System RAM
04000000-04f1bfff : System RAM
04f1c000-6b4b9fff : System RAM
6b4ba000-6b797fff : System RAM
6b798000-6b799fff : System RAM
6b79a000-6b79dfff : System RAM
6b79e000-6b79efff : System RAM
6b79f000-6b7fbfff : System RAM
6b7fc000-6c629fff : System RAM
6c62a000-6c800fff : System RAM
6c801000-6c843fff : System RAM
6c844000-6c847fff : System RAM
6c848000-6c849fff : System RAM
6c84a000-6c85dfff : System RAM
6c85e000-6c85efff : System RAM
6c85f000-6cbfbfff : System RAM
6cbfc000-6d349fff : System RAM
6d34a000-6d3fbfff : System RAM
6d3fc000-6d455fff : System RAM
6d4fc000-6d773fff : System RAM
100000000-7ffffffff : System RAM
4080000000-40ffffffff : System RAM
14004000000-147ffffffff : System RAM
==

But there is a confusion.

i386 and x86_64 registers System RAM as IORESOUCE_MEM | IORESOUCE_BUSY.
ia64 registers System RAM as IORESOURCE_MEM.

Which is better ?

I ask this because current memory hotplug treat memory as IORESOUCE_MEM.
When memory hot-add occurs on x86_64, new memory is added as IORESOUCE_MEM.
memory hot-remove (now) can remove only IORESOUCE_MEM.

If ia64 should treat System RAM as IORESOUCE_MEM | IORESOUCE_BUSY, I'll write
a fix.

Thanks,
-Kame










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