mm: fix up the vmscan stat in vmstat

The "pgsteal" stat is confusing because it counts both direct reclaim as
well as background reclaim.  However, we have "kswapd_steal" which also
counts background reclaim value.

This patch fixes it and also makes it match the existng "pgscan_" stats.

Test:
pgsteal_kswapd_dma32 447623
pgsteal_kswapd_normal 42272677
pgsteal_kswapd_movable 0
pgsteal_direct_dma32 2801
pgsteal_direct_normal 44353270
pgsteal_direct_movable 0

Signed-off-by: Ying Han <yinghan@google.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/vmstat.c b/mm/vmstat.c
index f600557a7659..7db1b9bab492 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -738,7 +738,8 @@ const char * const vmstat_text[] = {
         "pgmajfault",
 
         TEXTS_FOR_ZONES("pgrefill")
-        TEXTS_FOR_ZONES("pgsteal")
+        TEXTS_FOR_ZONES("pgsteal_kswapd")
+        TEXTS_FOR_ZONES("pgsteal_direct")
         TEXTS_FOR_ZONES("pgscan_kswapd")
         TEXTS_FOR_ZONES("pgscan_direct")
 
@@ -747,7 +748,6 @@ const char * const vmstat_text[] = {
 #endif
         "pginodesteal",
         "slabs_scanned",
-        "kswapd_steal",
         "kswapd_inodesteal",
         "kswapd_low_wmark_hit_quickly",
         "kswapd_high_wmark_hit_quickly",