Big memory, no struct page allocation

[David Chow <davidchow@shaolinmicro.com>]

Dear all,

Hi, I've got a silly but serious question. I want to allocate a large 
buffer (>512MB) in kernel. Normally you use __get_free_page and handle 
it with page pointers. But when get to very large (say 1024MB), I will 
need to use 2 level of page pointer indirection to carry the page 
pointer array. I also find the total size of page struct is quite large 
when using lots of pages, what I want is to use memory pages without 
struct page, is this possible? By the way, can I use lots of memory in 
the kernel, something like 1GB of memory allocation when physically RAM 
available? Please give advise. Thanks.

regards,
David

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