linux-kernel - [PATCH RFC tip/core/rcu 06/12] rcu: Distinguish between boosting and boosted

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Message-Id: <1289095532-5398-6-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Sat,  6 Nov 2010 19:05:26 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH RFC tip/core/rcu 06/12] rcu: Distinguish between boosting and boosted

RCU priority boosting's tracing did not distinguish between ongoing
boosting and completion of boosting.  This commit therefore adds this
capability.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcutiny_plugin.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h
index 419b796..297aa35 100644
--- a/kernel/rcutiny_plugin.h
+++ b/kernel/rcutiny_plugin.h
@@ -229,6 +229,9 @@ static void show_tiny_preempt_stats(struct seq_file *m)
 		seq_puts(m, "no");
 		break;
 	case 1:
+		seq_puts(m, "begun");
+		break;
+	case 2:
 		seq_puts(m, "done");
 		break;
 	default:
@@ -284,6 +287,7 @@ static int rcu_boost(void)
 	raw_local_irq_restore(flags);
 	rt_mutex_lock(&mtx);
 	RCU_TRACE(rcu_preempt_ctrlblk.n_tasks_boosted++);
+	rcu_preempt_ctrlblk.boosted_this_gp++;
 	rt_mutex_unlock(&mtx);
 	return rcu_preempt_ctrlblk.boost_tasks != NULL;
 }
-- 
1.7.0.6

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