Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> writes:
> +/* Returns true for head pages of in-use hugepages, otherwise returns false. */
> +bool is_hugepage_movable(struct page *hpage)
> +{
> + struct page *page;
> + struct hstate *h;
> + bool ret = false;
> +
> + VM_BUG_ON(!PageHuge(hpage));
> + /*
> + * This function can be called for a tail page because memory hotplug
> + * scans movability of pages by pfn range of a memory block.
> + * Larger hugepages (1GB for x86_64) are larger than memory block, so
> + * the scan can start at the tail page of larger hugepages.
> + * 1GB hugepage is not movable now, so we return with false for now.
> + */
> + if (PageTail(hpage))
> + return false;
> + h = page_hstate(hpage);
> + spin_lock(&hugetlb_lock);
> + list_for_each_entry(page, &h->hugepage_activelist, lru)
> + if (page == hpage) {
> + ret = true;
> + break;
> + }
> + spin_unlock(&hugetlb_lock);
> + return ret;
> +}
> +
May be is_hugepage_active() ?
-aneesh
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