mm: /proc/sys/vm/stat_refresh stop checking monotonic numa stats

All of the VM NUMA stats are event counts, incremented never
decremented: it is not very useful for vmstat_refresh() to check them
throughout their first aeon, then warn on them throughout their next.

Link: https://lkml.kernel.org/r/alpine.LSU.2.11.2102251514110.13363@eggly.anvilsSigned-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Roman Gushchin <guro@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/vmstat.c

@@ -1872,15 +1872,6 @@ int vmstat_refresh(struct ctl_table *table, int write,
 				__func__, zone_stat_name(i), val);
 		}
 	}
-#ifdef CONFIG_NUMA
-	for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++) {
-		val = atomic_long_read(&vm_numa_stat[i]);
-		if (val < 0) {
-			pr_warn("%s: %s %ld\n",
-				__func__, numa_stat_name(i), val);
-		}
-	}
-#endif
 	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
 		/*
 		 * Skip checking stats known to go negative occasionally.