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    Subject[PATCH 9/21] make-get_scan_ratio-to-memcg-safe.patch
    Currently, get_scan_ratio() always calculate the balancing value for global reclaim and
    memcg reclaim doesn't use it.
    Therefore it doesn't have scan_global_lru() condition.

    However, we plan to expand get_scan_ratio() to be usable for memcg too, latter.
    Then, The dependency code of global reclaim in the get_scan_ratio() insert into
    scan_global_lru() condision explictly.


    this patch doesn't have any functional change.

    Acked-by: Rik van Riel <riel@redhat.com>
    Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Index: mmotm-2.6.28-Dec02/mm/vmscan.c
    ===================================================================
    --- mmotm-2.6.28-Dec02.orig/mm/vmscan.c
    +++ mmotm-2.6.28-Dec02/mm/vmscan.c
    @@ -1430,13 +1430,16 @@ static void get_scan_ratio(struct zone *
    zone_nr_pages(zone, sc, LRU_INACTIVE_ANON);
    file = zone_nr_pages(zone, sc, LRU_ACTIVE_FILE) +
    zone_nr_pages(zone, sc, LRU_INACTIVE_FILE);
    - free = zone_page_state(zone, NR_FREE_PAGES);

    - /* If we have very few page cache pages, force-scan anon pages. */
    - if (unlikely(file + free <= zone->pages_high)) {
    - percent[0] = 100;
    - percent[1] = 0;
    - return;
    + if (scan_global_lru(sc)) {
    + free = zone_page_state(zone, NR_FREE_PAGES);
    + /* If we have very few page cache pages,
    + force-scan anon pages. */
    + if (unlikely(file + free <= zone->pages_high)) {
    + percent[0] = 100;
    + percent[1] = 0;
    + return;
    + }
    }

    /*


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