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    Subject[PATCH 2/3] check unevictable flag in lumy reclaim v2
    How about this ?

    From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

    Lumpy reclaim check 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 lump
    of pages for requested order.

    Changelog: v1->v2
    - rewrote commet.

    Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    ---
    mm/vmscan.c | 9 +++++++++
    1 file changed, 9 insertions(+)

    Index: lumpy-reclaim-trial/mm/vmscan.c
    ===================================================================
    --- lumpy-reclaim-trial.orig/mm/vmscan.c
    +++ lumpy-reclaim-trial/mm/vmscan.c
    @@ -936,6 +936,15 @@ 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;
    + /*
    + * We tries to free all pages in this range to create
    + * a free large page. Then, if the range includes a page
    + * never be reclaimed, we have no reason to do more.
    + * PageUnevictable page is not a page which can be
    + * easily freed. Abort this scan now.
    + */
    + 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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