Re: [PATCH, RFC 06/16] thp, mm: rewrite add_to_page_cache_locked() tosupport huge pages

[Hillf Danton]

On Mon, Jan 28, 2013 at 5:24 PM, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> +       page_cache_get(page);
> +       spin_lock_irq(&mapping->tree_lock);
> +       page->mapping = mapping;
> +       if (PageTransHuge(page)) {
> +               int i;
> +               for (i = 0; i < HPAGE_CACHE_NR; i++) {
> +                       page_cache_get(page + i);

Page count is raised twice for head page, why?

> +                       page[i].index = offset + i;
> +                       error = radix_tree_insert(&mapping->page_tree,
> +                                       offset + i, page + i);
> +                       if (error) {
> +                               page_cache_release(page + i);
> +                               break;
> +                       }
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