1 files changed, 111 insertions, 0 deletions

diff --git a/kernel/sched/stats.c b/kernel/sched/stats.c
new file mode 100644
index 000000000000..2a581ba8e190
--- /dev/null
+++ b/kernel/sched/stats.c
@@ -0,0 +1,111 @@
+
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+
+#include "sched.h"
+
+/*
+ * bump this up when changing the output format or the meaning of an existing
+ * format, so that tools can adapt (or abort)
+ */
+#define SCHEDSTAT_VERSION 15
+
+static int show_schedstat(struct seq_file *seq, void *v)
+{
+        int cpu;
+        int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
+        char *mask_str = kmalloc(mask_len, GFP_KERNEL);
+
+        if (mask_str == NULL)
+                return -ENOMEM;
+
+        seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
+        seq_printf(seq, "timestamp %lu\n", jiffies);
+        for_each_online_cpu(cpu) {
+                struct rq *rq = cpu_rq(cpu);
+#ifdef CONFIG_SMP
+                struct sched_domain *sd;
+                int dcount = 0;
+#endif
+
+                /* runqueue-specific stats */
+                seq_printf(seq,
+                    "cpu%d %u %u %u %u %u %u %llu %llu %lu",
+                    cpu, rq->yld_count,
+                    rq->sched_switch, rq->sched_count, rq->sched_goidle,
+                    rq->ttwu_count, rq->ttwu_local,
+                    rq->rq_cpu_time,
+                    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
+
+                seq_printf(seq, "\n");
+
+#ifdef CONFIG_SMP
+                /* domain-specific stats */
+                rcu_read_lock();
+                for_each_domain(cpu, sd) {
+                        enum cpu_idle_type itype;
+
+                        cpumask_scnprintf(mask_str, mask_len,
+                                          sched_domain_span(sd));
+                        seq_printf(seq, "domain%d %s", dcount++, mask_str);
+                        for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
+                                        itype++) {
+                                seq_printf(seq, " %u %u %u %u %u %u %u %u",
+                                    sd->lb_count[itype],
+                                    sd->lb_balanced[itype],
+                                    sd->lb_failed[itype],
+                                    sd->lb_imbalance[itype],
+                                    sd->lb_gained[itype],
+                                    sd->lb_hot_gained[itype],
+                                    sd->lb_nobusyq[itype],
+                                    sd->lb_nobusyg[itype]);
+                        }
+                        seq_printf(seq,
+                                   " %u %u %u %u %u %u %u %u %u %u %u %u\n",
+                            sd->alb_count, sd->alb_failed, sd->alb_pushed,
+                            sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
+                            sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
+                            sd->ttwu_wake_remote, sd->ttwu_move_affine,
+                            sd->ttwu_move_balance);
+                }
+                rcu_read_unlock();
+#endif
+        }
+        kfree(mask_str);
+        return 0;
+}
+
+static int schedstat_open(struct inode *inode, struct file *file)
+{
+        unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
+        char *buf = kmalloc(size, GFP_KERNEL);
+        struct seq_file *m;
+        int res;
+
+        if (!buf)
+                return -ENOMEM;
+        res = single_open(file, show_schedstat, NULL);
+        if (!res) {
+                m = file->private_data;
+                m->buf = buf;
+                m->size = size;
+        } else
+                kfree(buf);
+        return res;
+}
+
+static const struct file_operations proc_schedstat_operations = {
+        .open    = schedstat_open,
+        .read    = seq_read,
+        .llseek  = seq_lseek,
+        .release = single_release,
+};
+
+static int __init proc_schedstat_init(void)
+{
+        proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
+        return 0;
+}
+module_init(proc_schedstat_init);