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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-01-04 18:09:10 -0500
committerIngo Molnar <mingo@elte.hu>2010-01-13 03:06:05 -0500
commitbf66f18e79e34c421bbd8f6511e2c556b779df2f (patch)
tree2348e3bc8392addf7959fbe94003f7e0da2a1c8b /kernel/rcutree_plugin.h
parent46a1e34eda805501a8b32f26394faa435149f6d1 (diff)
rcu: Add force_quiescent_state() testing to rcutorture
Add force_quiescent_state() testing to rcutorture, with a separate thread that repeatedly invokes force_quiescent_state() in bursts. This can greatly increase the probability of encountering certain types of race conditions. Suggested-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1262646551116-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/rcutree_plugin.h')
-rw-r--r--kernel/rcutree_plugin.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 37fbccdf41d5..f11ebd44b454 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -62,6 +62,15 @@ long rcu_batches_completed(void)
62EXPORT_SYMBOL_GPL(rcu_batches_completed); 62EXPORT_SYMBOL_GPL(rcu_batches_completed);
63 63
64/* 64/*
65 * Force a quiescent state for preemptible RCU.
66 */
67void rcu_force_quiescent_state(void)
68{
69 force_quiescent_state(&rcu_preempt_state, 0);
70}
71EXPORT_SYMBOL_GPL(rcu_force_quiescent_state);
72
73/*
65 * Record a preemptable-RCU quiescent state for the specified CPU. Note 74 * Record a preemptable-RCU quiescent state for the specified CPU. Note
66 * that this just means that the task currently running on the CPU is 75 * that this just means that the task currently running on the CPU is
67 * not in a quiescent state. There might be any number of tasks blocked 76 * not in a quiescent state. There might be any number of tasks blocked
@@ -713,6 +722,16 @@ long rcu_batches_completed(void)
713EXPORT_SYMBOL_GPL(rcu_batches_completed); 722EXPORT_SYMBOL_GPL(rcu_batches_completed);
714 723
715/* 724/*
725 * Force a quiescent state for RCU, which, because there is no preemptible
726 * RCU, becomes the same as rcu-sched.
727 */
728void rcu_force_quiescent_state(void)
729{
730 rcu_sched_force_quiescent_state();
731}
732EXPORT_SYMBOL_GPL(rcu_force_quiescent_state);
733
734/*
716 * Because preemptable RCU does not exist, we never have to check for 735 * Because preemptable RCU does not exist, we never have to check for
717 * CPUs being in quiescent states. 736 * CPUs being in quiescent states.
718 */ 737 */