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    SubjectRe: [PATCH 1/11] Add __GFP_MOVABLE flag and update callers
    On Tue, 21 Nov 2006, Mel Gorman wrote:

    > On Tue, 21 Nov 2006, Christoph Lameter wrote:
    >
    > > Are GFP_HIGHUSER allocations always movable? It would reduce the size of
    > > the patch if this would be added to GFP_HIGHUSER.
    > No, they aren't. Page tables allocated with HIGHPTE are currently not movable
    > for example. A number of drivers (infiniband for example) also use
    > __GFP_HIGHMEM that are not movable.

    HIGHPTE with __GFP_USER set? This is a page table page right?
    pte_alloc_one does currently not set GFP_USER:

    struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
    {
    struct page *pte;

    #ifdef CONFIG_HIGHPTE
    pte =
    alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO, 0);
    #else
    pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
    #endif
    return pte;
    }

    How does infiniband insure that page migration does not move those pages?

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