sched/topology: Add 'doms_debug' proc entry

1 files changed, 58 insertions, 0 deletions

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 519b024f4e94..8010c2974d30 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -5,6 +5,8 @@
 #include <linux/sched.h>
 #include <linux/mutex.h>
 #include <linux/sched/isolation.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 
 #include "sched.h"
 
@@ -1930,3 +1932,59 @@ match2:
 	mutex_unlock(&sched_domains_mutex);
 }
 
+static int doms_debug_show(struct seq_file *seq, void *v)
+{
+	int i, cpu;
+	struct root_domain *rd;
+	struct rq *rq;
+	struct cpumask default_rd_span;
+
+	cpumask_and(&default_rd_span,
+		    def_root_domain.span, cpu_active_mask);
+
+	seq_printf(seq, "def_root_domain: %*pbl\n",
+		   cpumask_pr_args(&default_rd_span));
+
+	for (i = 0; i < ndoms_cur; i++) {
+		cpu = cpumask_first(doms_cur[i]);
+		if (cpu >= nr_cpu_ids) {
+			seq_printf(seq, "doms_cur[%d]: empty\n", i);
+			continue;
+		}
+
+		rq = cpu_rq(cpu);
+		rd = rq->rd;
+		seq_printf(seq, "doms_cur[%d]: %*pbl rd->span: %*pbl (%c)\n",
+			   i, cpumask_pr_args(doms_cur[i]),
+			   cpumask_pr_args(rd->span),
+			   rd == &def_root_domain ? 'd' : 'n');
+	}
+
+	return 0;
+}
+
+static int doms_debug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, doms_debug_show, NULL);
+}
+
+static const struct file_operations doms_debug_fops = {
+	.open		= doms_debug_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init init_doms_debug_procfs(void)
+{
+	struct proc_dir_entry *pe;
+
+	pe = proc_create("doms_debug", 0444, NULL, &doms_debug_fops);
+	if (!pe)
+		return -ENOMEM;
+
+	return 0;
+}
+
+__initcall(init_doms_debug_procfs);
+