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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-04-22 21:08:51 -0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-05-06 02:16:57 -0400
commit5ece5bab3ed8594ce2c85c6c6e6b82109db36ca7 (patch)
treec9ef8faa5dbb9e7c82893657e5aa2c1040987f96 /kernel/rcutree.c
parent15ba0ba860871cf74b48b1bb47c26c91a66126f3 (diff)
rcu: Add forward-progress diagnostic for per-CPU kthreads
Increment a per-CPU counter on each pass through rcu_cpu_kthread()'s service loop, and add it to the rcudata trace output. 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.c')
-rw-r--r--kernel/rcutree.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 27b6d8de82f6..575d6414763e 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -93,6 +93,7 @@ EXPORT_SYMBOL_GPL(rcu_scheduler_active);
93static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task); 93static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task);
94DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status); 94DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
95DEFINE_PER_CPU(int, rcu_cpu_kthread_cpu); 95DEFINE_PER_CPU(int, rcu_cpu_kthread_cpu);
96DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
96static DEFINE_PER_CPU(wait_queue_head_t, rcu_cpu_wq); 97static DEFINE_PER_CPU(wait_queue_head_t, rcu_cpu_wq);
97DEFINE_PER_CPU(char, rcu_cpu_has_work); 98DEFINE_PER_CPU(char, rcu_cpu_has_work);
98static char rcu_kthreads_spawnable; 99static char rcu_kthreads_spawnable;
@@ -1625,6 +1626,7 @@ static int rcu_cpu_kthread(void *arg)
1625 break; 1626 break;
1626 } 1627 }
1627 *statusp = RCU_KTHREAD_RUNNING; 1628 *statusp = RCU_KTHREAD_RUNNING;
1629 per_cpu(rcu_cpu_kthread_loops, cpu)++;
1628 local_irq_save(flags); 1630 local_irq_save(flags);
1629 work = *workp; 1631 work = *workp;
1630 *workp = 0; 1632 *workp = 0;