Re: [RFC] Hugetlb demotion for x86

[Dave Hansen]

On Wed, 2006-05-10 at 13:56 -0500, Adam Litke wrote:
> 
> +       do_munmap(mm, start, HPAGE_SIZE);
> +       start = do_mmap_pgoff(0, start, HPAGE_SIZE, prot, flags, 0);
> +       if (start < 0) {
> +               return VM_FAULT_OOM;
> +       } 


Hmm..  These are being done in this path, right?

	do_page_fault()
	handle_mm_fault()
	__handle_mm_fault()
	hugetlb_fault()
	hugetlb_demote_page()

I believe do_munmap() requires a write on mmap_sem(), but
do_page_fault() only takes a read.

-- Dave

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