Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / sched / stats.c

diff --git a/kernel/kernel/sched/stats.c b/kernel/kernel/sched/stats.c
new file mode 100644 (file)
index 0000000..87e2c9f
--- /dev/null
+++ b/kernel/kernel/sched/stats.c
@@ -0,0 +1,138 @@
+
+#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;
+
+       if (v == (void *)1) {
+               seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
+               seq_printf(seq, "timestamp %lu\n", jiffies);
+       } else {
+               struct rq *rq;
+#ifdef CONFIG_SMP
+               struct sched_domain *sd;
+               int dcount = 0;
+#endif
+               cpu = (unsigned long)(v - 2);
+               rq = cpu_rq(cpu);
+
+               /* runqueue-specific stats */
+               seq_printf(seq,
+                   "cpu%d %u 0 %u %u %u %u %llu %llu %lu",
+                   cpu, rq->yld_count,
+                   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;
+
+                       seq_printf(seq, "domain%d %*pb", dcount++,
+                                  cpumask_pr_args(sched_domain_span(sd)));
+                       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
+       }
+       return 0;
+}
+
+/*
+ * This itererator needs some explanation.
+ * It returns 1 for the header position.
+ * This means 2 is cpu 0.
+ * In a hotplugged system some cpus, including cpu 0, may be missing so we have
+ * to use cpumask_* to iterate over the cpus.
+ */
+static void *schedstat_start(struct seq_file *file, loff_t *offset)
+{
+       unsigned long n = *offset;
+
+       if (n == 0)
+               return (void *) 1;
+
+       n--;
+
+       if (n > 0)
+               n = cpumask_next(n - 1, cpu_online_mask);
+       else
+               n = cpumask_first(cpu_online_mask);
+
+       *offset = n + 1;
+
+       if (n < nr_cpu_ids)
+               return (void *)(unsigned long)(n + 2);
+       return NULL;
+}
+
+static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset)
+{
+       (*offset)++;
+       return schedstat_start(file, offset);
+}
+
+static void schedstat_stop(struct seq_file *file, void *data)
+{
+}
+
+static const struct seq_operations schedstat_sops = {
+       .start = schedstat_start,
+       .next  = schedstat_next,
+       .stop  = schedstat_stop,
+       .show  = show_schedstat,
+};
+
+static int schedstat_open(struct inode *inode, struct file *file)
+{
+       return seq_open(file, &schedstat_sops);
+}
+
+static const struct file_operations proc_schedstat_operations = {
+       .open    = schedstat_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+       .release = seq_release,
+};
+
+static int __init proc_schedstat_init(void)
+{
+       proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
+       return 0;
+}
+subsys_initcall(proc_schedstat_init);