Re: [Linux-ia64] about linux/ia64 mm

David Mosberger
2001-11-30T05:43:18Z

>>>>> On Thu, 29 Nov 2001 23:19:53 +0800, "=?gb2312?B?zMYg0+4=?=" <ytang5@hotmail.com> said:

Tang> hi all, i was a little confused by linux/ia64 mm; as i know,
Tang> linux requires physical memory to be mapped contiguously to
Tang> kernel space( don't care highmem); and PAGE_OFFSET is defined
Tang> to 0xe000000000000000 in linux/ia64; that's region 7, its page
Tang> size is fixed to 64M(2.4.12). how could __get_free_pages()
Tang> allocate such a big _page_? it's absolutely impossible. so i
Tang> think i made a big mistake somewhere, would someone help me
Tang> out? thx :-)

The page allocator works at the page frame level, which can be
configured to have a size of 4, 8, 16, or 64KB. The large TLB
mappings are used merely to access the underlying memory (think of it
as a physical address space with a non-zero starting address).

--david