allocation of contiguous memory in kernel mode

[J.Hwan Kim]

Hi, everyone

I wish to alloc physically contiguous memory in kernel mode.
I used the __get_free_pages(gfp_mask, order) function,
but it fails occasionary.
I guess it is caused by memory fragmentation.
My code is kernel driver module which cannot use
bootmem allocation and its platform is x86_64.
My server desktop has 20GB memory.
I wish to know the method to allocate physically
contiguous memory not failing by fragmentation.

Thanks in advance.

Best Regards,
J.Hwan Kim

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