mm/vmscan.c: simplify shrink_inactive_list()

This merges together duplicated patterns of code.  Also, replace
count_memcg_events() with its irq-careless namesake, because they are
already called in interrupts disabled context.

Link: http://lkml.kernel.org/r/2ece1df4-2989-bc9b-6172-61e9fdde5bfd@virtuozzo.com
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 41a14ee..8880767 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1907,6 +1907,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
        unsigned long nr_taken;
        struct reclaim_stat stat;
        int file = is_file_lru(lru);
+       enum vm_event_item item;
        struct pglist_data *pgdat = lruvec_pgdat(lruvec);
        struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
        bool stalled = false;
@@ -1934,17 +1935,10 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
        __mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, nr_taken);
        reclaim_stat->recent_scanned[file] += nr_taken;
 
-       if (current_is_kswapd()) {
-               if (global_reclaim(sc))
-                       __count_vm_events(PGSCAN_KSWAPD, nr_scanned);
-               count_memcg_events(lruvec_memcg(lruvec), PGSCAN_KSWAPD,
-                                  nr_scanned);
-       } else {
-               if (global_reclaim(sc))
-                       __count_vm_events(PGSCAN_DIRECT, nr_scanned);
-               count_memcg_events(lruvec_memcg(lruvec), PGSCAN_DIRECT,
-                                  nr_scanned);
-       }
+       item = current_is_kswapd() ? PGSCAN_KSWAPD : PGSCAN_DIRECT;
+       if (global_reclaim(sc))
+               __count_vm_events(item, nr_scanned);
+       __count_memcg_events(lruvec_memcg(lruvec), item, nr_scanned);
        spin_unlock_irq(&pgdat->lru_lock);
 
        if (nr_taken == 0)
@@ -1955,17 +1949,10 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 
        spin_lock_irq(&pgdat->lru_lock);
 
-       if (current_is_kswapd()) {
-               if (global_reclaim(sc))
-                       __count_vm_events(PGSTEAL_KSWAPD, nr_reclaimed);
-               count_memcg_events(lruvec_memcg(lruvec), PGSTEAL_KSWAPD,
-                                  nr_reclaimed);
-       } else {
-               if (global_reclaim(sc))
-                       __count_vm_events(PGSTEAL_DIRECT, nr_reclaimed);
-               count_memcg_events(lruvec_memcg(lruvec), PGSTEAL_DIRECT,
-                                  nr_reclaimed);
-       }
+       item = current_is_kswapd() ? PGSTEAL_KSWAPD : PGSTEAL_DIRECT;
+       if (global_reclaim(sc))
+               __count_vm_events(item, nr_reclaimed);
+       __count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed);
        reclaim_stat->recent_rotated[0] = stat.nr_activate[0];
        reclaim_stat->recent_rotated[1] = stat.nr_activate[1];