1 files changed, 206 insertions, 0 deletions
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
new file mode 100644
index 000000000..510413eb2
--- /dev/null
+++ b/fs/proc/stat.c
@@ -0,0 +1,206 @@
+#include <linux/cpumask.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/irqnr.h>
+#include <linux/cputime.h>
+#include <linux/tick.h>
+
+#ifndef arch_irq_stat_cpu
+#define arch_irq_stat_cpu(cpu) 0
+#endif
+#ifndef arch_irq_stat
+#define arch_irq_stat() 0
+#endif
+
+#ifdef arch_idle_time
+
+static cputime64_t get_idle_time(int cpu)
+{
+	cputime64_t idle;
+
+	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
+	if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
+		idle += arch_idle_time(cpu);
+	return idle;
+}
+
+static cputime64_t get_iowait_time(int cpu)
+{
+	cputime64_t iowait;
+
+	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
+	if (cpu_online(cpu) && nr_iowait_cpu(cpu))
+		iowait += arch_idle_time(cpu);
+	return iowait;
+}
+
+#else
+
+static u64 get_idle_time(int cpu)
+{
+	u64 idle, idle_time = -1ULL;
+
+	if (cpu_online(cpu))
+		idle_time = get_cpu_idle_time_us(cpu, NULL);
+
+	if (idle_time == -1ULL)
+		/* !NO_HZ or cpu offline so we can rely on cpustat.idle */
+		idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
+	else
+		idle = usecs_to_cputime64(idle_time);
+
+	return idle;
+}
+
+static u64 get_iowait_time(int cpu)
+{
+	u64 iowait, iowait_time = -1ULL;
+
+	if (cpu_online(cpu))
+		iowait_time = get_cpu_iowait_time_us(cpu, NULL);
+
+	if (iowait_time == -1ULL)
+		/* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
+		iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
+	else
+		iowait = usecs_to_cputime64(iowait_time);
+
+	return iowait;
+}
+
+#endif
+
+static int show_stat(struct seq_file *p, void *v)
+{
+	int i, j;
+	unsigned long jif;
+	u64 user, nice, system, idle, iowait, irq, softirq, steal;
+	u64 guest, guest_nice;
+	u64 sum = 0;
+	u64 sum_softirq = 0;
+	unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
+	struct timespec boottime;
+
+	user = nice = system = idle = iowait =
+		irq = softirq = steal = 0;
+	guest = guest_nice = 0;
+	getboottime(&boottime);
+	jif = boottime.tv_sec;
+
+	for_each_possible_cpu(i) {
+		user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
+		nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
+		system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
+		idle += get_idle_time(i);
+		iowait += get_iowait_time(i);
+		irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
+		softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
+		steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
+		guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
+		guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
+		sum += kstat_cpu_irqs_sum(i);
+		sum += arch_irq_stat_cpu(i);
+
+		for (j = 0; j < NR_SOFTIRQS; j++) {
+			unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
+
+			per_softirq_sums[j] += softirq_stat;
+			sum_softirq += softirq_stat;
+		}
+	}
+	sum += arch_irq_stat();
+
+	seq_puts(p, "cpu ");
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
+	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
+	seq_putc(p, '\n');
+
+	for_each_online_cpu(i) {
+		/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
+		user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
+		nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
+		system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
+		idle = get_idle_time(i);
+		iowait = get_iowait_time(i);
+		irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
+		softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
+		steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
+		guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
+		guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
+		seq_printf(p, "cpu%d", i);
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
+		seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
+		seq_putc(p, '\n');
+	}
+	seq_printf(p, "intr %llu", (unsigned long long)sum);
+
+	/* sum again ? it could be updated? */
+	for_each_irq_nr(j)
+		seq_put_decimal_ull(p, ' ', kstat_irqs_usr(j));
+
+	seq_printf(p,
+		"\nctxt %llu\n"
+		"btime %lu\n"
+		"processes %lu\n"
+		"procs_running %lu\n"
+		"procs_blocked %lu\n",
+		nr_context_switches(),
+		(unsigned long)jif,
+		total_forks,
+		nr_running(),
+		nr_iowait());
+
+	seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
+
+	for (i = 0; i < NR_SOFTIRQS; i++)
+		seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
+	seq_putc(p, '\n');
+
+	return 0;
+}
+
+static int stat_open(struct inode *inode, struct file *file)
+{
+	size_t size = 1024 + 128 * num_online_cpus();
+
+	/* minimum size to display an interrupt count : 2 bytes */
+	size += 2 * nr_irqs;
+	return single_open_size(file, show_stat, NULL, size);
+}
+
+static const struct file_operations proc_stat_operations = {
+	.open		= stat_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init proc_stat_init(void)
+{
+	proc_create("stat", 0, NULL, &proc_stat_operations);
+	return 0;
+}
+fs_initcall(proc_stat_init);