+ *
+ * rcu_stress_count: Histogram of "ages" of structures seen by readers. If any
+ * entries past the first two are non-zero, RCU is broken. The age of a newly
+ * allocated structure is zero, it becomes one when removed from reader
+ * visibility, and is incremented once per grace period subsequently -- and is
+ * freed after passing through (RCU_STRESS_PIPE_LEN-2) grace periods. Since
+ * this tests only has one true writer (there are fake writers), only buckets at
+ * indexes 0 and 1 should be none-zero.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright (c) 2008 Paul E. McKenney, IBM Corporation.