mm: show_free_areas(): display slab pages in two separate fields

If an OOM happens, we really want to know the number of remaining
reclaimable pages.  So the reclaimable slab and unreclaimable slab fields
should not be combined for display.
Signed-off-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: NMinchan Kim <minchan.kim@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/page_alloc.c

@@ -2138,7 +2138,8 @@ void show_free_areas(void)
 		" inactive_file:%lu"
 		" unevictable:%lu"
 		" dirty:%lu writeback:%lu unstable:%lu\n"
-		" free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
+		" free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
+		" mapped:%lu pagetables:%lu bounce:%lu\n",
 		global_page_state(NR_ACTIVE_ANON),
 		global_page_state(NR_ACTIVE_FILE),
 		global_page_state(NR_INACTIVE_ANON),
@@ -2148,8 +2149,8 @@ void show_free_areas(void)
 		global_page_state(NR_WRITEBACK),
 		global_page_state(NR_UNSTABLE_NFS),
 		global_page_state(NR_FREE_PAGES),
-		global_page_state(NR_SLAB_RECLAIMABLE) +
-			global_page_state(NR_SLAB_UNRECLAIMABLE),
+		global_page_state(NR_SLAB_RECLAIMABLE),
+		global_page_state(NR_SLAB_UNRECLAIMABLE),
 		global_page_state(NR_FILE_MAPPED),
 		global_page_state(NR_PAGETABLE),
 		global_page_state(NR_BOUNCE));