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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-10-11 17:14:32 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-11-08 11:57:07 -0800
commit7bd8f2a74bcbd39f4277766f4d49441c45dd10a0 (patch)
tree53b348112b73c8d2d1224250096d8aaacc7c7c5a /kernel/rcutree_trace.c
parent6ee0886ff6c81526bf6ad8521d843b934aafa5aa (diff)
downloadlinaro-lsk-7bd8f2a74bcbd39f4277766f4d49441c45dd10a0.tar.gz
rcu: Add tracing for synchronize_sched_expedited()
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>
Diffstat (limited to 'kernel/rcutree_trace.c')
-rw-r--r--kernel/rcutree_trace.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 967115c508b..f9512687a6e 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -173,6 +173,38 @@ 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 *)m->private;
+
+ 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\n",
+ 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 int rcuexp_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, show_rcuexp, inode->i_private);
+}
+
+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)
@@ -405,6 +437,11 @@ 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)