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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2011-04-22 18:08:51 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-05-05 23:16:57 -0700 |
| commit | 5ece5bab3ed8594ce2c85c6c6e6b82109db36ca7 (patch) | |
| tree | c9ef8faa5dbb9e7c82893657e5aa2c1040987f96 /kernel/rcutree.c | |
| parent | 15ba0ba860871cf74b48b1bb47c26c91a66126f3 (diff) | |
| download | linux-5ece5bab3ed8594ce2c85c6c6e6b82109db36ca7.tar.bz2 | |
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.c | 2 |
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); static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task); DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status); DEFINE_PER_CPU(int, rcu_cpu_kthread_cpu); +DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); static DEFINE_PER_CPU(wait_queue_head_t, rcu_cpu_wq); DEFINE_PER_CPU(char, rcu_cpu_has_work); static char rcu_kthreads_spawnable; @@ -1625,6 +1626,7 @@ static int rcu_cpu_kthread(void *arg) break; } *statusp = RCU_KTHREAD_RUNNING; + per_cpu(rcu_cpu_kthread_loops, cpu)++; local_irq_save(flags); work = *workp; *workp = 0; |