diff --git a/fs/dcache.c b/fs/dcache.c
index 9f2aa96..0466dbd 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -121,7 +121,19 @@ static DEFINE_PER_CPU(long, nr_dentry);
 static DEFINE_PER_CPU(long, nr_dentry_unused);
 
 #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
-/* scan possible cpus instead of online and avoid worrying about CPU hotplug. */
+
+/*
+ * Here we resort to our own counters instead of using generic per-cpu counters
+ * for consistency with what the vfs inode code does. We are expected to harvest
+ * better code and performance by having our own specialized counters.
+ *
+ * Please note that the loop is done over all possible CPUs, not over all online
+ * CPUs. The reason for this is that we don't want to play games with CPUs going
+ * on and off. If one of them goes off, we will just keep their counters.
+ *
+ * glommer: See cffbc8a for details, and if you ever intend to change this,
+ * please update all vfs counters to match.
+ */
 static long get_nr_dentry(void)
 {
 	int i;