mm: trivial cleanups in vmscan.c

Utter trivia in mm/vmscan.c, mostly just reducing the linecount slightly;
most exciting change being get_scan_count() calling vmscan_swappiness()
once instead of twice.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 21 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8b941f303cea..05d439dc1af9 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1025,12 +1025,9 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
                 unsigned long *nr_scanned, struct scan_control *sc,
                 isolate_mode_t mode, enum lru_list lru)
 {
-        struct list_head *src;
+        struct list_head *src = &lruvec->lists[lru];
         unsigned long nr_taken = 0;
         unsigned long scan;
-        int file = is_file_lru(lru);
-
-        src = &lruvec->lists[lru];
 
         for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
                 struct page *page;
@@ -1058,11 +1055,8 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
         }
 
         *nr_scanned = scan;
-
-        trace_mm_vmscan_lru_isolate(sc->order,
-                        nr_to_scan, scan,
-                        nr_taken,
-                        mode, file);
+        trace_mm_vmscan_lru_isolate(sc->order, nr_to_scan, scan,
+                                    nr_taken, mode, is_file_lru(lru));
         return nr_taken;
 }
 
@@ -1140,8 +1134,7 @@ static int too_many_isolated(struct zone *zone, int file,
 }
 
 static noinline_for_stack void
-putback_inactive_pages(struct lruvec *lruvec,
-                       struct list_head *page_list)
+putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
 {
         struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
         struct zone *zone = lruvec_zone(lruvec);
@@ -1235,11 +1228,9 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
         if (global_reclaim(sc)) {
                 zone->pages_scanned += nr_scanned;
                 if (current_is_kswapd())
-                        __count_zone_vm_events(PGSCAN_KSWAPD, zone,
-                                               nr_scanned);
+                        __count_zone_vm_events(PGSCAN_KSWAPD, zone, nr_scanned);
                 else
-                        __count_zone_vm_events(PGSCAN_DIRECT, zone,
-                                               nr_scanned);
+                        __count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scanned);
         }
         spin_unlock_irq(&zone->lru_lock);
 
@@ -1534,9 +1525,9 @@ static int inactive_file_is_low(struct lruvec *lruvec)
         return inactive_file_is_low_global(lruvec_zone(lruvec));
 }
 
-static int inactive_list_is_low(struct lruvec *lruvec, int file)
+static int inactive_list_is_low(struct lruvec *lruvec, enum lru_list lru)
 {
-        if (file)
+        if (is_file_lru(lru))
                 return inactive_file_is_low(lruvec);
         else
                 return inactive_anon_is_low(lruvec);
@@ -1545,10 +1536,8 @@ static int inactive_list_is_low(struct lruvec *lruvec, int file)
 static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
                                  struct lruvec *lruvec, struct scan_control *sc)
 {
-        int file = is_file_lru(lru);
-
         if (is_active_lru(lru)) {
-                if (inactive_list_is_low(lruvec, file))
+                if (inactive_list_is_low(lruvec, lru))
                         shrink_active_list(nr_to_scan, lruvec, sc, lru);
                 return 0;
         }
@@ -1630,7 +1619,7 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
          * This scanning priority is essentially the inverse of IO cost.
          */
         anon_prio = vmscan_swappiness(sc);
-        file_prio = 200 - vmscan_swappiness(sc);
+        file_prio = 200 - anon_prio;
 
         /*
          * OK, so we have swap space and a fair amount of page cache