mm/vmstat: add note on safety of drain_zonestat
authorCody P Schafer <cody@linux.vnet.ibm.com>
Mon, 29 Apr 2013 22:08:38 +0000 (15:08 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 29 Apr 2013 22:54:38 +0000 (15:54 -0700)
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/vmstat.c

index c823776..f42745e 100644 (file)
@@ -493,6 +493,10 @@ void refresh_cpu_vm_stats(int cpu)
                        atomic_long_add(global_diff[i], &vm_stat[i]);
 }
 
+/*
+ * this is only called if !populated_zone(zone), which implies no other users of
+ * pset->vm_stat_diff[] exsist.
+ */
 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset)
 {
        int i;