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    Subject[PATCH 64 of 66] scale nr_rotated to balance memory pressure
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    From: Rik van Riel <riel@redhat.com>

    Make sure we scale up nr_rotated when we encounter a referenced
    transparent huge page. This ensures pageout scanning balance
    is not distorted when there are huge pages on the LRU.

    Signed-off-by: Rik van Riel <riel@redhat.com>
    Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
    ---

    diff --git a/mm/vmscan.c b/mm/vmscan.c
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -1259,7 +1259,8 @@ putback_lru_pages(struct zone *zone, str
    add_page_to_lru_list(zone, page, lru);
    if (is_active_lru(lru)) {
    int file = is_file_lru(lru);
    - reclaim_stat->recent_rotated[file]++;
    + int numpages = hpage_nr_pages(page);
    + reclaim_stat->recent_rotated[file] += numpages;
    }
    if (!pagevec_add(&pvec, page)) {
    spin_unlock_irq(&zone->lru_lock);
    @@ -1535,7 +1536,7 @@ static void shrink_active_list(unsigned
    }

    if (page_referenced(page, 0, sc->mem_cgroup, &vm_flags)) {
    - nr_rotated++;
    + nr_rotated += hpage_nr_pages(page);
    /*
    * Identify referenced, file-backed active pages and
    * give them one more trip around the active list. So

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