Merge branch 'acpi-misc'

[linux-2.6-microblaze.git] / include / linux / vmstat.h

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 773135f..506d625 100644 (file)
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -313,6 +313,12 @@ static inline void __mod_node_page_state(struct pglist_data *pgdat,
                        enum node_stat_item item, int delta)
 {
        if (vmstat_item_in_bytes(item)) {
+               /*
+                * Only cgroups use subpage accounting right now; at
+                * the global level, these items still change in
+                * multiples of whole pages. Store them as pages
+                * internally to keep the per-cpu counters compact.
+                */
                VM_WARN_ON_ONCE(delta & (PAGE_SIZE - 1));
                delta >>= PAGE_SHIFT;
        }