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    Subject[PATCH 2/3] check unevictable flag in lumy reclaim
    From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

    Lumpy reclaim scans pages from their pfn. Then, it can find unevictable pages
    in its loop. Abort lumpy reclaim when we find Unevictable page, we never get a
    block of pages for requested order.

    Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    ---
    Index: lumpy-reclaim-trial/mm/vmscan.c
    ===================================================================
    --- lumpy-reclaim-trial.orig/mm/vmscan.c
    +++ lumpy-reclaim-trial/mm/vmscan.c
    @@ -936,6 +936,9 @@ static unsigned long isolate_lru_pages(u
    /* Check that we have not crossed a zone boundary. */
    if (unlikely(page_zone_id(cursor_page) != zone_id))
    continue;
    + /* Abort when the page is mlocked */
    + if (unlikely(PageUnevictable(cursor_page)))
    + break;
    if (__isolate_lru_page(cursor_page, mode, file) == 0) {
    list_move(&cursor_page->lru, dst);
    nr_taken++;


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