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Commit 385680a9 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
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rcu: Add event-trace markers to TREE_RCU kthreads 



Add event-trace markers to TREE_RCU kthreads to allow including these
kthread's CPU time in the utilization calculations.

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent eab0993c

include/trace/events/rcu.h

+3 −0
Original line number Diff line number Diff line
@@ -13,6 +13,9 @@ 
 * "Start <activity>" -- Mark the start of the specified activity,

 *			 such as "context switch".  Nesting is permitted.

 * "End <activity>" -- Mark the end of the specified activity.

 *

 * An "@" character within "<activity>" is a comment character: Data

 * reduction scripts will ignore the "@" and the remainder of the line.

 */

TRACE_EVENT(rcu_utilization,

kernel/rcutree_plugin.h

+12 −0
Original line number Diff line number Diff line
@@ -1219,9 +1219,12 @@ static int rcu_boost_kthread(void *arg) 
	int spincnt = 0;

	int more2boost;



	trace_rcu_utilization("Start boost kthread@init");

	for (;;) {

		rnp->boost_kthread_status = RCU_KTHREAD_WAITING;

		trace_rcu_utilization("End boost kthread@rcu_wait");

		rcu_wait(rnp->boost_tasks || rnp->exp_tasks);

		trace_rcu_utilization("Start boost kthread@rcu_wait");

		rnp->boost_kthread_status = RCU_KTHREAD_RUNNING;

		more2boost = rcu_boost(rnp);

		if (more2boost)
@@ -1229,11 +1232,14 @@ static int rcu_boost_kthread(void *arg) 
		else

			spincnt = 0;

		if (spincnt > 10) {

			trace_rcu_utilization("End boost kthread@rcu_yield");

			rcu_yield(rcu_boost_kthread_timer, (unsigned long)rnp);

			trace_rcu_utilization("Start boost kthread@rcu_yield");

			spincnt = 0;

		}

	}

	/* NOTREACHED */

	trace_rcu_utilization("End boost kthread@notreached");

	return 0;

}
@@ -1490,9 +1496,12 @@ static int rcu_cpu_kthread(void *arg) 
	char work;

	char *workp = &per_cpu(rcu_cpu_has_work, cpu);



	trace_rcu_utilization("Start CPU kthread@init");

	for (;;) {

		*statusp = RCU_KTHREAD_WAITING;

		trace_rcu_utilization("End CPU kthread@rcu_wait");

		rcu_wait(*workp != 0 || kthread_should_stop());

		trace_rcu_utilization("Start CPU kthread@rcu_wait");

		local_bh_disable();

		if (rcu_cpu_kthread_should_stop(cpu)) {

			local_bh_enable();
@@ -1513,11 +1522,14 @@ static int rcu_cpu_kthread(void *arg) 
			spincnt = 0;

		if (spincnt > 10) {

			*statusp = RCU_KTHREAD_YIELDING;

			trace_rcu_utilization("End CPU kthread@rcu_yield");

			rcu_yield(rcu_cpu_kthread_timer, (unsigned long)cpu);

			trace_rcu_utilization("Start CPU kthread@rcu_yield");

			spincnt = 0;

		}

	}

	*statusp = RCU_KTHREAD_STOPPED;

	trace_rcu_utilization("End CPU kthread@term");

	return 0;

}