[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/sched/stat.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/irqnr.h>
#include <linux/sched/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 u64 get_idle_time(int cpu)
{
	u64 idle;

	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
	if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
		idle += arch_idle_time(cpu);
	return idle;
}

static u64 get_iowait_time(int cpu)
{
	u64 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_usecs = -1ULL;

	if (cpu_online(cpu))
		idle_usecs = get_cpu_idle_time_us(cpu, NULL);

	if (idle_usecs == -1ULL)
		/* !NO_HZ or cpu offline so we can rely on cpustat.idle */
		idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
	else
		idle = idle_usecs * NSEC_PER_USEC;

	return idle;
}

static u64 get_iowait_time(int cpu)
{
	u64 iowait, iowait_usecs = -1ULL;

	if (cpu_online(cpu))
		iowait_usecs = get_cpu_iowait_time_us(cpu, NULL);

	if (iowait_usecs == -1ULL)
		/* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
		iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
	else
		iowait = iowait_usecs * NSEC_PER_USEC;

	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_put_decimal_ull(p, "cpu  ", nsec_to_clock_t(user));
	seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
	seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
	seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
	seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
	seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
	seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
	seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
	seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
	seq_put_decimal_ull(p, " ", nsec_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, " ", nsec_to_clock_t(user));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
		seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
		seq_putc(p, '\n');
	}
	seq_put_decimal_ull(p, "intr ", (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_put_decimal_ull(p, "softirq ", (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>
03441a34	8	#include <linux/sched/stat.h>
df8106db AD	9	#include <linux/seq_file.h>
	10	#include <linux/slab.h>
	11	#include <linux/time.h>
26ddd8d5	12	#include <linux/irqnr.h>
32ef5517	13	#include <linux/sched/cputime.h>
a25cac51	14	#include <linux/tick.h>
df8106db AD	15
	16	#ifndef arch_irq_stat_cpu
	17	#define arch_irq_stat_cpu(cpu) 0
	18	#endif
	19	#ifndef arch_irq_stat
	20	#define arch_irq_stat() 0
	21	#endif
cb85a6ed MS	22
	23	#ifdef arch_idle_time
	24
7fb1327e	25	static u64 get_idle_time(int cpu)
cb85a6ed	26	{
7fb1327e	27	u64 idle;
cb85a6ed MS	28
	29	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
	30	if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
42b425b3	31	idle += arch_idle_time(cpu);
cb85a6ed MS	32	return idle;
	33	}
	34
7fb1327e	35	static u64 get_iowait_time(int cpu)
cb85a6ed	36	{
7fb1327e	37	u64 iowait;
cb85a6ed MS	38
	39	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
	40	if (cpu_online(cpu) && nr_iowait_cpu(cpu))
42b425b3	41	iowait += arch_idle_time(cpu);
cb85a6ed MS	42	return iowait;
	43	}
	44
	45	#else
df8106db	46
3292beb3	47	static u64 get_idle_time(int cpu)
a25cac51	48	{
7fb1327e	49	u64 idle, idle_usecs = -1ULL;
7386cdbf MH	50
7386cdbf MH	51	if (cpu_online(cpu))
7fb1327e	52	idle_usecs = get_cpu_idle_time_us(cpu, NULL);
a25cac51	53
7fb1327e	54	if (idle_usecs == -1ULL)
7386cdbf	55	/* !NO_HZ or cpu offline so we can rely on cpustat.idle */
3292beb3	56	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
cb85a6ed	57	else
7fb1327e	58	idle = idle_usecs * NSEC_PER_USEC;
a25cac51 MH	59
	60	return idle;
	61	}
	62
3292beb3	63	static u64 get_iowait_time(int cpu)
a25cac51	64	{
7fb1327e	65	u64 iowait, iowait_usecs = -1ULL;
7386cdbf MH	66
7386cdbf MH	67	if (cpu_online(cpu))
7fb1327e	68	iowait_usecs = get_cpu_iowait_time_us(cpu, NULL);
a25cac51	69
7fb1327e	70	if (iowait_usecs == -1ULL)
7386cdbf	71	/* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
3292beb3	72	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
a25cac51	73	else
7fb1327e	74	iowait = iowait_usecs * NSEC_PER_USEC;
a25cac51 MH	75
	76	return iowait;
	77	}
	78
cb85a6ed MS	79	#endif
cb85a6ed MS	80
df8106db AD	81	static int show_stat(struct seq_file p, void v)
	82	{
	83	int i, j;
3292beb3 GC	84	u64 user, nice, system, idle, iowait, irq, softirq, steal;
3292beb3 GC	85	u64 guest, guest_nice;
df8106db	86	u64 sum = 0;
d3d64df2 KK	87	u64 sum_softirq = 0;
d3d64df2 KK	88	unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
519ded5a	89	struct timespec64 boottime;
df8106db AD	90
df8106db AD	91	user = nice = system = idle = iowait =
3292beb3 GC	92	irq = softirq = steal = 0;
3292beb3 GC	93	guest = guest_nice = 0;
519ded5a	94	getboottime64(&boottime);
df8106db AD	95
df8106db AD	96	for_each_possible_cpu(i) {
3292beb3 GC	97	user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
	98	nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	99	system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
	100	idle += get_idle_time(i);
	101	iowait += get_iowait_time(i);
	102	irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	103	softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	104	steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	105	guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	106	guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
f7e6746e RK	107	sum += kstat_cpu_irqs_sum(i);
f7e6746e RK	108	sum += arch_irq_stat_cpu(i);
d3d64df2 KK	109
	110	for (j = 0; j < NR_SOFTIRQS; j++) {
	111	unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
	112
	113	per_softirq_sums[j] += softirq_stat;
	114	sum_softirq += softirq_stat;
	115	}
df8106db AD	116	}
	117	sum += arch_irq_stat();
	118
7fb1327e FW	119	seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user));
	120	seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
	121	seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
	122	seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
	123	seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
	124	seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
	125	seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
	126	seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
	127	seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
	128	seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
1ac101a5 KH	129	seq_putc(p, '\n');
1ac101a5 KH	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	143	seq_printf(p, "cpu%d", i);
7fb1327e FW	144	seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
	145	seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
	146	seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
	147	seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
	148	seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
	149	seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
	150	seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
	151	seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
	152	seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
	153	seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
1ac101a5	154	seq_putc(p, '\n');
df8106db	155	}
75ba1d07	156	seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
df8106db AD	157
df8106db AD	158	/* sum again ? it could be updated? */
478735e3	159	for_each_irq_nr(j)
75ba1d07	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
75ba1d07	174	seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
d3d64df2 KK	175
d3d64df2 KK	176	for (i = 0; i < NR_SOFTIRQS; i++)
75ba1d07	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);