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rcu: Remove debugfs tracing

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RCU's debugfs tracing used to be the only reasonable low-level debug
information available, but ftrace and event tracing has since surpassed
the RCU debugfs level of usefulness.  This commit therefore removes
RCU's debugfs tracing.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2017-05-15 15:30:32 -07:00
parent bd8cc5a062
commit ae91aa0adb
13 changed files with 4 additions and 1192 deletions
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27
kernel/rcu/tree.h
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@@ -152,19 +152,6 @@ struct rcu_node {
/* Number of tasks boosted for expedited GP. */
unsigned long n_normal_boosts;
/* Number of tasks boosted for normal GP. */
unsigned long n_balk_blkd_tasks;
/* Refused to boost: no blocked tasks. */
unsigned long n_balk_exp_gp_tasks;
/* Refused to boost: nothing blocking GP. */
unsigned long n_balk_boost_tasks;
/* Refused to boost: already boosting. */
unsigned long n_balk_notblocked;
/* Refused to boost: RCU RS CS still running. */
unsigned long n_balk_notyet;
/* Refused to boost: not yet time. */
unsigned long n_balk_nos;
/* Refused to boost: not sure why, though. */
/* This can happen due to race conditions. */
#ifdef CONFIG_RCU_NOCB_CPU
struct swait_queue_head nocb_gp_wq[2];
/* Place for rcu_nocb_kthread() to wait GP. */
@@ -535,17 +522,3 @@ void srcu_offline_cpu(unsigned int cpu) { }
#endif /* #else #ifdef CONFIG_SRCU */
#endif /* #ifndef RCU_TREE_NONCORE */
#ifdef CONFIG_RCU_TRACE
/* Read out queue lengths for tracing. */
static inline void rcu_nocb_q_lengths(struct rcu_data *rdp, long *ql, long *qll)
{
#ifdef CONFIG_RCU_NOCB_CPU
*ql = atomic_long_read(&rdp->nocb_q_count);
*qll = atomic_long_read(&rdp->nocb_q_count_lazy);
#else /* #ifdef CONFIG_RCU_NOCB_CPU */
*ql = 0;
*qll = 0;
#endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */
}
#endif /* #ifdef CONFIG_RCU_TRACE */