forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

rcu: add tracing for RCU's kthread run states.

Browse source 
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>
This commit is contained in:
Paul E. McKenney 2011-03-29 17:48:28 -07:00 • committed by Paul E. McKenney
parent 0ac3d136b2
commit d71df90ead
4 changed files with 44 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

11
kernel/rcutree.h
View file

@ -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;
/*