Messages in this thread | | | Date | Wed, 3 Oct 2007 10:31:36 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | [Question] How to represent SYSTEM_RAM in kerenel/resouce.c |
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Hi,
Now, SYSTEM_RAM is registerd to resouce list and a user can see memory map from /proc/iomem, like following. == [kamezawa@drpq 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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