[mirror_ubuntu-artful-kernel.git] / fs / proc / stat.c

#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;
	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 timespec64 boottime;

	user = nice = system = idle = iowait =
		irq = softirq = steal = 0;
	guest = guest_nice = 0;
	getboottime64(&boottime);

	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 %llu\n"
		"processes %lu\n"
		"procs_running %lu\n"
		"procs_blocked %lu\n",
		nr_context_switches(),
		(unsigned long long)boottime.tv_sec,
		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);
Commit	Line	Data
df8106db AD	1	#include <linux/cpumask.h>
df8106db AD	2	#include <linux/fs.h>
df8106db AD	3	#include <linux/init.h>
	4	#include <linux/interrupt.h>
	5	#include <linux/kernel_stat.h>
	6	#include <linux/proc_fs.h>
	7	#include <linux/sched.h>
	8	#include <linux/seq_file.h>
	9	#include <linux/slab.h>
	10	#include <linux/time.h>
26ddd8d5	11	#include <linux/irqnr.h>
bfc3f028	12	#include <linux/cputime.h>
a25cac51	13	#include <linux/tick.h>
df8106db AD	14
	15	#ifndef arch_irq_stat_cpu
	16	#define arch_irq_stat_cpu(cpu) 0
	17	#endif
	18	#ifndef arch_irq_stat
	19	#define arch_irq_stat() 0
	20	#endif
cb85a6ed MS	21
	22	#ifdef arch_idle_time
	23
	24	static cputime64_t get_idle_time(int cpu)
	25	{
	26	cputime64_t idle;
	27
	28	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
	29	if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
	30	idle += arch_idle_time(cpu);
	31	return idle;
	32	}
	33
	34	static cputime64_t get_iowait_time(int cpu)
	35	{
	36	cputime64_t iowait;
	37
	38	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
	39	if (cpu_online(cpu) && nr_iowait_cpu(cpu))
	40	iowait += arch_idle_time(cpu);
	41	return iowait;
	42	}
	43
	44	#else
df8106db	45
3292beb3	46	static u64 get_idle_time(int cpu)
a25cac51	47	{
7386cdbf MH	48	u64 idle, idle_time = -1ULL;
	49
	50	if (cpu_online(cpu))
	51	idle_time = get_cpu_idle_time_us(cpu, NULL);
a25cac51	52
cb85a6ed	53	if (idle_time == -1ULL)
7386cdbf	54	/* !NO_HZ or cpu offline so we can rely on cpustat.idle */
3292beb3	55	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
cb85a6ed	56	else
34845636	57	idle = usecs_to_cputime64(idle_time);
a25cac51 MH	58
	59	return idle;
	60	}
	61
3292beb3	62	static u64 get_iowait_time(int cpu)
a25cac51	63	{
7386cdbf MH	64	u64 iowait, iowait_time = -1ULL;
	65
	66	if (cpu_online(cpu))
	67	iowait_time = get_cpu_iowait_time_us(cpu, NULL);
a25cac51 MH	68
a25cac51 MH	69	if (iowait_time == -1ULL)
7386cdbf	70	/* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
3292beb3	71	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
a25cac51	72	else
34845636	73	iowait = usecs_to_cputime64(iowait_time);
a25cac51 MH	74
	75	return iowait;
	76	}
	77
cb85a6ed MS	78	#endif
cb85a6ed MS	79
df8106db AD	80	static int show_stat(struct seq_file p, void v)
	81	{
	82	int i, j;
3292beb3 GC	83	u64 user, nice, system, idle, iowait, irq, softirq, steal;
3292beb3 GC	84	u64 guest, guest_nice;
df8106db	85	u64 sum = 0;
d3d64df2 KK	86	u64 sum_softirq = 0;
d3d64df2 KK	87	unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
519ded5a	88	struct timespec64 boottime;
df8106db AD	89
df8106db AD	90	user = nice = system = idle = iowait =
3292beb3 GC	91	irq = softirq = steal = 0;
3292beb3 GC	92	guest = guest_nice = 0;
519ded5a	93	getboottime64(&boottime);
df8106db AD	94
df8106db AD	95	for_each_possible_cpu(i) {
3292beb3 GC	96	user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
	97	nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	98	system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
	99	idle += get_idle_time(i);
	100	iowait += get_iowait_time(i);
	101	irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	102	softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	103	steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	104	guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	105	guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
f7e6746e RK	106	sum += kstat_cpu_irqs_sum(i);
f7e6746e RK	107	sum += arch_irq_stat_cpu(i);
d3d64df2 KK	108
	109	for (j = 0; j < NR_SOFTIRQS; j++) {
	110	unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
	111
	112	per_softirq_sums[j] += softirq_stat;
	113	sum_softirq += softirq_stat;
	114	}
df8106db AD	115	}
	116	sum += arch_irq_stat();
	117
1ac101a5 KH	118	seq_puts(p, "cpu ");
	119	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
	120	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
	121	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
	122	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
	123	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
	124	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
	125	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
	126	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
	127	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
	128	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
	129	seq_putc(p, '\n');
	130
df8106db	131	for_each_online_cpu(i) {
df8106db	132	/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
3292beb3 GC	133	user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
	134	nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	135	system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
a25cac51 MH	136	idle = get_idle_time(i);
a25cac51 MH	137	iowait = get_iowait_time(i);
3292beb3 GC	138	irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	139	softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	140	steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	141	guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	142	guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
1ac101a5 KH	143	seq_printf(p, "cpu%d", i);
	144	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
	145	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
	146	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
	147	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
	148	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
	149	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
	150	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
	151	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
	152	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
	153	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
	154	seq_putc(p, '\n');
df8106db AD	155	}
	156	seq_printf(p, "intr %llu", (unsigned long long)sum);
	157
	158	/* sum again ? it could be updated? */
478735e3	159	for_each_irq_nr(j)
c291ee62	160	seq_put_decimal_ull(p, ' ', kstat_irqs_usr(j));
df8106db AD	161
	162	seq_printf(p,
	163	"\nctxt %llu\n"
519ded5a	164	"btime %llu\n"
df8106db AD	165	"processes %lu\n"
	166	"procs_running %lu\n"
	167	"procs_blocked %lu\n",
	168	nr_context_switches(),
519ded5a	169	(unsigned long long)boottime.tv_sec,
df8106db AD	170	total_forks,
	171	nr_running(),
	172	nr_iowait());
	173
d3d64df2 KK	174	seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
	175
	176	for (i = 0; i < NR_SOFTIRQS; i++)
1ac101a5	177	seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
9d6de12f	178	seq_putc(p, '\n');
d3d64df2	179
df8106db AD	180	return 0;
	181	}
	182
	183	static int stat_open(struct inode inode, struct file file)
	184	{
f74373a5	185	size_t size = 1024 + 128 * num_online_cpus();
df8106db	186
59a32e2c ED	187	/* minimum size to display an interrupt count : 2 bytes */
59a32e2c ED	188	size += 2 * nr_irqs;
f74373a5	189	return single_open_size(file, show_stat, NULL, size);
df8106db AD	190	}
	191
	192	static const struct file_operations proc_stat_operations = {
	193	.open = stat_open,
	194	.read = seq_read,
	195	.llseek = seq_lseek,
	196	.release = single_release,
	197	};
	198
	199	static int __init proc_stat_init(void)
	200	{
	201	proc_create("stat", 0, NULL, &proc_stat_operations);
	202	return 0;
	203	}
abaf3787	204	fs_initcall(proc_stat_init);