linux-kernel - [PATCH tip/core/rcu 09/14] rcu: split 'rcubarrier' to each flavor

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Message-Id: <1351616713-26930-9-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Tue, 30 Oct 2012 10:05:08 -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, edumazet@...gle.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu, patches@...aro.org,
	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 09/14] rcu: split 'rcubarrier' to each flavor

From: Michael Wang <wangyun@...ux.vnet.ibm.com>

This patch add new 'rcubarrier' to each flavor's folder, now we could use:
	'cat /debugfs/rcu/rsp/rcubarrier'
to get the selected rsp info.

Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcutree_trace.c |   27 +++++++++++++++++++++++++++
 1 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 209e696..8b03bfb 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -101,6 +101,28 @@ static const struct file_operations rcubarrier_fops = {
 	.release = single_release,
 };
 
+static int new_show_rcubarrier(struct seq_file *m, void *v)
+{
+	struct rcu_state *rsp = (struct rcu_state *)m->private;
+	seq_printf(m, "bcc: %d nbd: %lu\n",
+		   atomic_read(&rsp->barrier_cpu_count),
+		   rsp->n_barrier_done);
+	return 0;
+}
+
+static int new_rcubarrier_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, new_show_rcubarrier, inode->i_private);
+}
+
+static const struct file_operations new_rcubarrier_fops = {
+	.owner = THIS_MODULE,
+	.open = new_rcubarrier_open,
+	.read = seq_read,
+	.llseek = no_llseek,
+	.release = seq_release,
+};
+
 #ifdef CONFIG_RCU_BOOST
 
 static char convert_kthread_status(unsigned int kthread_status)
@@ -429,6 +451,11 @@ static int __init rcutree_trace_init(void)
 					rspdir, rsp, &rcu_pending_fops);
 			if (!retval)
 				goto free_out;
+
+			retval = debugfs_create_file("rcubarrier", 0444,
+					rspdir, rsp, &new_rcubarrier_fops);
+			if (!retval)
+				goto free_out;
 	}
 
 	retval = debugfs_create_file("rcubarrier", 0444, rcudir,
-- 
1.7.8

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