mm/vmscan: push lruvec pointer into get_scan_count()

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 16 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6dbf2c2082e..b139ad7f396 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -150,11 +150,6 @@ static bool global_reclaim(struct scan_control *sc)
 }
 #endif
 
-static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
-{
-        return &mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup)->reclaim_stat;
-}
-
 static unsigned long get_lruvec_size(struct lruvec *lruvec, enum lru_list lru)
 {
         if (!mem_cgroup_disabled())
@@ -1581,20 +1576,18 @@ static int vmscan_swappiness(struct scan_control *sc)
  *
  * nr[0] = anon pages to scan; nr[1] = file pages to scan
  */
-static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
+static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
                            unsigned long *nr)
 {
         unsigned long anon, file, free;
         unsigned long anon_prio, file_prio;
         unsigned long ap, fp;
-        struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
+        struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
         u64 fraction[2], denominator;
         enum lru_list lru;
         int noswap = 0;
         bool force_scan = false;
-        struct lruvec *lruvec;
-
-        lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
+        struct zone *zone = lruvec_zone(lruvec);
 
         /*
          * If the zone or memcg is small, nr[l] can be 0.  This
@@ -1606,7 +1599,7 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
          * latencies, so it's better to scan a minimum amount there as
          * well.
          */
-        if (current_is_kswapd() && mz->zone->all_unreclaimable)
+        if (current_is_kswapd() && zone->all_unreclaimable)
                 force_scan = true;
         if (!global_reclaim(sc))
                 force_scan = true;
@@ -1626,10 +1619,10 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
                 get_lruvec_size(lruvec, LRU_INACTIVE_FILE);
 
         if (global_reclaim(sc)) {
-                free  = zone_page_state(mz->zone, NR_FREE_PAGES);
+                free  = zone_page_state(zone, NR_FREE_PAGES);
                 /* If we have very few page cache pages,
                    force-scan anon pages. */
-                if (unlikely(file + free <= high_wmark_pages(mz->zone))) {
+                if (unlikely(file + free <= high_wmark_pages(zone))) {
                         fraction[0] = 1;
                         fraction[1] = 0;
                         denominator = 1;
@@ -1655,7 +1648,7 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
          *
          * anon in [0], file in [1]
          */
-        spin_lock_irq(&mz->zone->lru_lock);
+        spin_lock_irq(&zone->lru_lock);
         if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
                 reclaim_stat->recent_scanned[0] /= 2;
                 reclaim_stat->recent_rotated[0] /= 2;
@@ -1676,7 +1669,7 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
 
         fp = file_prio * (reclaim_stat->recent_scanned[1] + 1);
         fp /= reclaim_stat->recent_rotated[1] + 1;
-        spin_unlock_irq(&mz->zone->lru_lock);
+        spin_unlock_irq(&zone->lru_lock);
 
         fraction[0] = ap;
         fraction[1] = fp;
@@ -1794,7 +1787,7 @@ static void shrink_mem_cgroup_zone(struct mem_cgroup_zone *mz,
 restart:
         nr_reclaimed = 0;
         nr_scanned = sc->nr_scanned;
-        get_scan_count(mz, sc, nr);
+        get_scan_count(lruvec, sc, nr);
 
         blk_start_plug(&plug);
         while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||