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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-03-30 02:48:28 +0200
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-05-06 08:16:56 +0200
commitd71df90eadfc35aa549ff9a850842673febca71f (patch)
treedd275a3f4848784bc6625574341c11befc1b3823 /kernel/rcutree.h
parentrcu: add callback-queue information to rcudata output (diff)
downloadlinux-d71df90eadfc35aa549ff9a850842673febca71f.tar.xz
linux-d71df90eadfc35aa549ff9a850842673febca71f.zip
rcu: add tracing for RCU's kthread run states.
Add tracing to help debugging situations when RCU's kthreads are not running but are supposed to be. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree.h')
-rw-r--r--kernel/rcutree.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index d49046c79c59..67341dbebd95 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -89,6 +89,13 @@ struct rcu_dynticks {
atomic_t dynticks; /* Even value for dynticks-idle, else odd. */
};
+/* RCU's kthread states for tracing. */
+#define RCU_KTHREAD_STOPPED 0
+#define RCU_KTHREAD_RUNNING 1
+#define RCU_KTHREAD_WAITING 2
+#define RCU_KTHREAD_YIELDING 3
+#define RCU_KTHREAD_MAX 3
+
/*
* Definition for node within the RCU grace-period-detection hierarchy.
*/
@@ -152,6 +159,8 @@ struct rcu_node {
wait_queue_head_t boost_wq;
/* Wait queue on which to park the boost */
/* kthread. */
+ unsigned int boost_kthread_status;
+ /* State of boost_kthread_task for tracing. */
unsigned long n_tasks_boosted;
/* Total number of tasks boosted. */
unsigned long n_exp_boosts;
@@ -179,6 +188,8 @@ struct rcu_node {
wait_queue_head_t node_wq;
/* Wait queue on which to park the per-node */
/* kthread. */
+ unsigned int node_kthread_status;
+ /* State of node_kthread_task for tracing. */
} ____cacheline_internodealigned_in_smp;
/*