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Commit bec06785 authored Jan 10, 2018 by Paul E. McKenney

rcu: Remove obsolete boost statistics for debugfs



The debugfs interface displayed statistics on RCU priority boosting,
but this interface has since been removed.  This commit therefore
removes the no-longer-used rcu_data structure's ->n_tasks_boosted,
->n_exp_boosts, and ->n_exp_boosts and their updates.

If this information proves necessary in the future, the corresponding
event traces will be added.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent 3caa973b

kernel/rcu/tree.h

+0 −6

Original line number	Diff line number	Diff line
		@@ -146,12 +146,6 @@ struct rcu_node {
		/* boosting for this rcu_node structure. */
		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;
		/* Number of tasks boosted for expedited GP. */
		unsigned long n_normal_boosts;
		/* Number of tasks boosted for normal GP. */
		#ifdef CONFIG_RCU_NOCB_CPU
		struct swait_queue_head nocb_gp_wq[2];
		/* Place for rcu_nocb_kthread() to wait GP. */

kernel/rcu/tree_plugin.h

+2 −6

Original line number	Diff line number	Diff line
		@@ -963,14 +963,10 @@ static int rcu_boost(struct rcu_node *rnp)
		* expedited grace period must boost all blocked tasks, including
		* those blocking the pre-existing normal grace period.
		*/
		if (rnp->exp_tasks != NULL) {
		if (rnp->exp_tasks != NULL)
		tb = rnp->exp_tasks;
		rnp->n_exp_boosts++;
		} else {
		else
		tb = rnp->boost_tasks;
		rnp->n_normal_boosts++;
		}
		rnp->n_tasks_boosted++;

		/*
		* We boost task t by manufacturing an rt_mutex that appears to