rcu: Optimize the 'rcudata.csv' for RCU trace
This patch implements the new 'rcudata.csv' interface under each rsp
directory, by using the 'CPU units sequence reading', thus avoiding loss
of tracing data.
Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index a11522f..e387a64 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -267,6 +267,43 @@
.release = single_release,
};
+static int new_show_rcudata_csv(struct seq_file *m, void *v)
+{
+ struct rcu_data *rdp = (struct rcu_data *)v;
+ if (cpumask_first(cpu_possible_mask) == rdp->cpu) {
+ seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pq\",");
+ seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
+ seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\"");
+#ifdef CONFIG_RCU_BOOST
+ seq_puts(m, "\"kt\",\"ktl\"");
+#endif /* #ifdef CONFIG_RCU_BOOST */
+ seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n");
+ }
+
+ print_one_rcu_data_csv(m, rdp);
+ return 0;
+}
+
+static const struct seq_operations new_rcudate_csv_op = {
+ .start = r_start,
+ .next = r_next,
+ .stop = r_stop,
+ .show = new_show_rcudata_csv,
+};
+
+static int new_rcudata_csv_open(struct inode *inode, struct file *file)
+{
+ return r_open(inode, file, &new_rcudate_csv_op);
+}
+
+static const struct file_operations new_rcudata_csv_fops = {
+ .owner = THIS_MODULE,
+ .open = new_rcudata_csv_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)
@@ -519,6 +556,11 @@
rspdir, rsp, &new_rcudata_fops);
if (!retval)
goto free_out;
+
+ retval = debugfs_create_file("rcudata.csv", 0444,
+ rspdir, rsp, &new_rcudata_csv_fops);
+ if (!retval)
+ goto free_out;
}
retval = debugfs_create_file("rcubarrier", 0444, rcudir,