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    Subject[PATCH] memory hotremoval for linux-2.6.7 [10/16]
    From

    --- linux-2.6.7.ORG/mm/hugetlb.c Thu Jun 17 15:17:51 2032
    +++ linux-2.6.7/mm/hugetlb.c Thu Jun 17 15:21:18 2032
    @@ -15,8 +15,20 @@ const unsigned long hugetlb_zero = 0, hu
    static unsigned long nr_huge_pages, free_huge_pages;
    unsigned long max_huge_pages;
    static struct list_head hugepage_freelists[MAX_NUMNODES];
    +static struct list_head hugepage_alllists[MAX_NUMNODES];
    static spinlock_t hugetlb_lock = SPIN_LOCK_UNLOCKED;

    +static void register_huge_page(struct page *page)
    +{
    + list_add(&page[1].lru,
    + &hugepage_alllists[page_zone(page)->zone_pgdat->node_id]);
    +}
    +
    +static void unregister_huge_page(struct page *page)
    +{
    + list_del(&page[1].lru);
    +}
    +
    static void enqueue_huge_page(struct page *page)
    {
    list_add(&page->lru,
    @@ -90,14 +102,17 @@ static int __init hugetlb_init(void)
    unsigned long i;
    struct page *page;

    - for (i = 0; i < MAX_NUMNODES; ++i)
    + for (i = 0; i < MAX_NUMNODES; ++i) {
    INIT_LIST_HEAD(&hugepage_freelists[i]);
    + INIT_LIST_HEAD(&hugepage_alllists[i]);
    + }

    for (i = 0; i < max_huge_pages; ++i) {
    page = alloc_fresh_huge_page();
    if (!page)
    break;
    spin_lock(&hugetlb_lock);
    + register_huge_page(page);
    enqueue_huge_page(page);
    spin_unlock(&hugetlb_lock);
    }
    @@ -139,6 +154,7 @@ static int try_to_free_low(unsigned long
    if (PageHighMem(page))
    continue;
    list_del(&page->lru);
    + unregister_huge_page(page);
    update_and_free_page(page);
    --free_huge_pages;
    if (!--count)
    @@ -161,6 +177,7 @@ static unsigned long set_max_huge_pages(
    if (!page)
    return nr_huge_pages;
    spin_lock(&hugetlb_lock);
    + register_huge_page(page);
    enqueue_huge_page(page);
    free_huge_pages++;
    nr_huge_pages++;
    @@ -174,6 +191,7 @@ static unsigned long set_max_huge_pages(
    struct page *page = dequeue_huge_page();
    if (!page)
    break;
    + unregister_huge_page(page);
    update_and_free_page(page);
    }
    spin_unlock(&hugetlb_lock);
    -
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