linux-kernel - [PATCH 17/24] jrcu: track #passes since last end-of-batch

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Message-ID: <20110324174803.GA18922@tsunami.ccur.com>
Date:	Thu, 24 Mar 2011 13:48:03 -0400
From:	Joe Korty <joe.korty@...r.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	fweisbec@...il.com, peterz@...radead.org, laijs@...fujitsu.com,
	mathieu.desnoyers@...icios.com, dhowells@...hat.com,
	loic.minier@...aro.org, dhaval.giani@...il.com, tglx@...utronix.de,
	josh@...htriplett.org, houston.jim@...cast.net,
	andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: [PATCH 17/24] jrcu: track #passes since last end-of-batch

jrcu: track how many passes have gone by since last end-of-batch.

Signed-off-by: Joe Korty <joe.korty@...r.com>

Index: b/kernel/jrcu.c
===================================================================
--- a/kernel/jrcu.c
+++ b/kernel/jrcu.c
@@ -120,6 +120,7 @@ static struct rcu_data rcu_data[NR_CPUS]
 /* debug & statistics stuff */
 static struct rcu_stats {
 	unsigned npasses;	/* #passes made */
+	unsigned nlast;		/* #passes since last end-of-batch */
 	unsigned nbatches;	/* #end-of-batches (eobs) seen */
 	atomic_t nbarriers;	/* #rcu barriers processed */
 	atomic_t nsyncs;	/* #rcu syncs processed */
@@ -329,6 +330,8 @@ static void __rcu_delimit_batches(struct
 	 * gone by.
 	 */
 	rcu_now = sched_clock();
+	rcu_stats.nlast++;
+
 	if (!eob && !rcu_timestamp
 	&& ((rcu_now - rcu_timestamp) > (s64)rcu_wdog * NSEC_PER_SEC)) {
 		rcu_stats.nforced++;
@@ -389,6 +392,7 @@ static void __rcu_delimit_batches(struct
 	 */
 	xchg(&rcu_which, prev); /* only place where rcu_which is written to */
 	rcu_stats.nbatches++;
+	rcu_stats.nlast = 0;
 }
 
 static void rcu_delimit_batches(void)
@@ -598,6 +602,8 @@ static int rcu_debugfs_show(struct seq_f
 		rcu_stats.nbatches);
 	seq_printf(m, "%14u: #passes not resulting in end-of-batch\n",
 		rcu_stats.npasses - rcu_stats.nbatches);
+	seq_printf(m, "%14u: #passes since last end-of-batch\n",
+		rcu_stats.nlast);
 	seq_printf(m, "%14u: #msecs since last end-of-batch\n",
 		msecs);
 	seq_printf(m, "%14u: #passes forced (0 is best)\n",
--
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