[Question] How to represent SYSTEM_RAM in kerenel/resouce.c

KAMEZAWA Hiroyuki
2007-10-03T01:31:36Z

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