rcu: Remove debugfs tracing
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>
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 7f5919a..43f2f80 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -70,7 +70,7 @@ static bool __read_mostly rcu_nocb_poll; /* Offload kthread are to poll. */
static void __init rcu_bootup_announce_oddness(void)
{
if (IS_ENABLED(CONFIG_RCU_TRACE))
- pr_info("\tRCU debugfs-based tracing is enabled.\n");
+ pr_info("\tRCU event tracing is enabled.\n");
if ((IS_ENABLED(CONFIG_64BIT) && RCU_FANOUT != 64) ||
(!IS_ENABLED(CONFIG_64BIT) && RCU_FANOUT != 32))
pr_info("\tCONFIG_RCU_FANOUT set to non-default value of %d\n",
@@ -899,33 +899,6 @@ void exit_rcu(void)
#include "../locking/rtmutex_common.h"
-#ifdef CONFIG_RCU_TRACE
-
-static void rcu_initiate_boost_trace(struct rcu_node *rnp)
-{
- if (!rcu_preempt_has_tasks(rnp))
- rnp->n_balk_blkd_tasks++;
- else if (rnp->exp_tasks == NULL && rnp->gp_tasks == NULL)
- rnp->n_balk_exp_gp_tasks++;
- else if (rnp->gp_tasks != NULL && rnp->boost_tasks != NULL)
- rnp->n_balk_boost_tasks++;
- else if (rnp->gp_tasks != NULL && rnp->qsmask != 0)
- rnp->n_balk_notblocked++;
- else if (rnp->gp_tasks != NULL &&
- ULONG_CMP_LT(jiffies, rnp->boost_time))
- rnp->n_balk_notyet++;
- else
- rnp->n_balk_nos++;
-}
-
-#else /* #ifdef CONFIG_RCU_TRACE */
-
-static void rcu_initiate_boost_trace(struct rcu_node *rnp)
-{
-}
-
-#endif /* #else #ifdef CONFIG_RCU_TRACE */
-
static void rcu_wake_cond(struct task_struct *t, int status)
{
/*
@@ -1058,7 +1031,6 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
lockdep_assert_held(&rnp->lock);
if (!rcu_preempt_blocked_readers_cgp(rnp) && rnp->exp_tasks == NULL) {
- rnp->n_balk_exp_gp_tasks++;
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
return;
}
@@ -1074,7 +1046,6 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
if (t)
rcu_wake_cond(t, rnp->boost_kthread_status);
} else {
- rcu_initiate_boost_trace(rnp);
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
}
}
