path: root/kernel/rcupdate.c
diff options
authorPaul E. McKenney <paulmck@us.ibm.com>2005-10-30 15:03:12 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 17:37:27 -0800
commita241ec65aeac3d69a08a7b153cccbdb7ea35063f (patch)
treee96585e8b1e699f31bad1fa61f34d2ec7c3a187c /kernel/rcupdate.c
parentb3099b48da23686d8378133b0264ee00385ee5fa (diff)
[PATCH] RCU torture-testing kernel module
This patch is a rewrite of the one submitted on October 1st, using modules (http://marc.theaimsgroup.com/?l=linux-kernel&m=112819093522998&w=2). This rewrite adds a tristate CONFIG_RCU_TORTURE_TEST, which enables an intense torture test of the RCU infratructure. This is needed due to the continued changes to the RCU infrastructure to accommodate dynamic ticks, CPU hotplug, realtime, and so on. Most of the code is in a separate file that is compiled only if the CONFIG variable is set. Documentation on how to run the test and interpret the output is also included. This code has been tested on i386 and ppc64, and an earlier version of the code has received extensive testing on a number of architectures as part of the PREEMPT_RT patchset. Signed-off-by: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/rcupdate.c')
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 2559d4b8f23f..c4d159a21e04 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -154,6 +154,15 @@ void fastcall call_rcu_bh(struct rcu_head *head,
+ * Return the number of RCU batches processed thus far. Useful
+ * for debug and statistics.
+ */
+long rcu_batches_completed(void)
+ return rcu_ctrlblk.completed;
* Invoke the completed RCU callbacks. They are expected to be in
* a per-cpu list.
@@ -501,6 +510,7 @@ void synchronize_kernel(void)
module_param(maxbatch, int, 0);
EXPORT_SYMBOL(call_rcu); /* WARNING: GPL-only in April 2006. */
EXPORT_SYMBOL(call_rcu_bh); /* WARNING: GPL-only in April 2006. */

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