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Subject[PATCH tip/core/rcu 14/14] rcu: Add tracing for synchronize_sched_expedited()
Date
From: "Paul E. McKenney" <paul.mckenney@linaro.org>

This commit adds a per-RCU-flavor "rcuexp" file that dumps out
statistics for synchonize_sched_expedited().

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
kernel/rcutree_trace.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index c6f9cb3..e84679c 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -171,6 +171,45 @@ static const struct file_operations rcudata_fops = {
.release = seq_release,
};

+static int show_rcuexp(struct seq_file *m, void *v)
+{
+ struct rcu_state *rsp = (struct rcu_state *)v;
+
+ seq_printf(m, "s=%lu d=%lu w=%lu tf=%lu wd1=%lu wd2=%lu n=%lu sc=%lu dt=%lu dl=%lu dx=%lu",
+ atomic_long_read(&rsp->expedited_start),
+ atomic_long_read(&rsp->expedited_done),
+ atomic_long_read(&rsp->expedited_wrap),
+ atomic_long_read(&rsp->expedited_tryfail),
+ atomic_long_read(&rsp->expedited_workdone1),
+ atomic_long_read(&rsp->expedited_workdone2),
+ atomic_long_read(&rsp->expedited_normal),
+ atomic_long_read(&rsp->expedited_stoppedcpus),
+ atomic_long_read(&rsp->expedited_done_tries),
+ atomic_long_read(&rsp->expedited_done_lost),
+ atomic_long_read(&rsp->expedited_done_exit));
+ return 0;
+}
+
+static const struct seq_operations rcuexp_op = {
+ .start = r_start,
+ .next = r_next,
+ .stop = r_stop,
+ .show = show_rcuexp,
+};
+
+static int rcuexp_open(struct inode *inode, struct file *file)
+{
+ return r_open(inode, file, &rcuexp_op);
+}
+
+static const struct file_operations rcuexp_fops = {
+ .owner = THIS_MODULE,
+ .open = rcuexp_open,
+ .read = seq_read,
+ .llseek = no_llseek,
+ .release = seq_release,
+};
+
#ifdef CONFIG_RCU_BOOST

static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
@@ -402,6 +441,11 @@ static int __init rcutree_trace_init(void)
if (!retval)
goto free_out;

+ retval = debugfs_create_file("rcuexp", 0444,
+ rspdir, rsp, &rcuexp_fops);
+ if (!retval)
+ goto free_out;
+
retval = debugfs_create_file("rcu_pending", 0444,
rspdir, rsp, &rcu_pending_fops);
if (!retval)
--
1.7.8


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