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    Subject[PATCH v2 2/2] vmscan: shrink_slab() require number of lru_pages, not page order
    Date
    Fix simple argument error. Usually 'order' is very small value than
    lru_pages. then it can makes unnecessary icache dropping.

    Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    ---
    mm/vmscan.c | 4 +++-
    1 files changed, 3 insertions(+), 1 deletions(-)

    diff --git a/mm/vmscan.c b/mm/vmscan.c
    index 8715da1..60d813b 100644
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -2617,6 +2617,8 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)

    n = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
    if (n > zone->min_slab_pages) {
    + unsigned long lru_pages = zone_reclaimable_pages(zone);
    +
    /*
    * shrink_slab() does not currently allow us to determine how
    * many pages were freed in this zone. So we take the current
    @@ -2627,7 +2629,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
    * Note that shrink_slab will free memory on all zones and may
    * take a long time.
    */
    - while (shrink_slab(sc.nr_scanned, gfp_mask, order) &&
    + while (shrink_slab(sc.nr_scanned, gfp_mask, lru_pages) &&
    (zone_page_state(zone, NR_SLAB_RECLAIMABLE) + nr_pages > n))
    ;

    --
    1.6.5.2




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