[linux.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 <asm/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 = get_cpu_idle_time_us(cpu, NULL);

	if (idle_time == -1ULL)
		/* !NO_HZ 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 = get_cpu_iowait_time_us(cpu, NULL);

	if (iowait_time == -1ULL)
		/* !NO_HZ 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(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)
{
	unsigned size = 1024 + 128 * num_possible_cpus();
	char *buf;
	struct seq_file *m;
	int res;

	/* minimum size to display an interrupt count : 2 bytes */
	size += 2 * nr_irqs;

	/* don't ask for more than the kmalloc() max size */
	if (size > KMALLOC_MAX_SIZE)
		size = KMALLOC_MAX_SIZE;
	buf = kmalloc(size, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	res = single_open(file, show_stat, NULL);
	if (!res) {
		m = file->private_data;
		m->buf = buf;
		m->size = ksize(buf);
	} else
		kfree(buf);
	return res;
}

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;
}
module_init(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>
df8106db	12	#include <asm/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	{
3292beb3	48	u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);
a25cac51	49
cb85a6ed	50	if (idle_time == -1ULL)
a25cac51	51	/* !NO_HZ so we can rely on cpustat.idle */
3292beb3	52	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
cb85a6ed	53	else
34845636	54	idle = usecs_to_cputime64(idle_time);
a25cac51 MH	55
	56	return idle;
	57	}
	58
3292beb3	59	static u64 get_iowait_time(int cpu)
a25cac51	60	{
3292beb3	61	u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL);
a25cac51 MH	62
	63	if (iowait_time == -1ULL)
	64	/* !NO_HZ so we can rely on cpustat.iowait */
3292beb3	65	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
a25cac51	66	else
34845636	67	iowait = usecs_to_cputime64(iowait_time);
a25cac51 MH	68
	69	return iowait;
	70	}
	71
cb85a6ed MS	72	#endif
cb85a6ed MS	73
df8106db AD	74	static int show_stat(struct seq_file p, void v)
	75	{
	76	int i, j;
	77	unsigned long jif;
3292beb3 GC	78	u64 user, nice, system, idle, iowait, irq, softirq, steal;
3292beb3 GC	79	u64 guest, guest_nice;
df8106db	80	u64 sum = 0;
d3d64df2 KK	81	u64 sum_softirq = 0;
d3d64df2 KK	82	unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
df8106db	83	struct timespec boottime;
df8106db AD	84
df8106db AD	85	user = nice = system = idle = iowait =
3292beb3 GC	86	irq = softirq = steal = 0;
3292beb3 GC	87	guest = guest_nice = 0;
df8106db AD	88	getboottime(&boottime);
	89	jif = boottime.tv_sec;
	90
	91	for_each_possible_cpu(i) {
3292beb3 GC	92	user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
	93	nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	94	system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
	95	idle += get_idle_time(i);
	96	iowait += get_iowait_time(i);
	97	irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	98	softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	99	steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	100	guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	101	guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
f7e6746e RK	102	sum += kstat_cpu_irqs_sum(i);
f7e6746e RK	103	sum += arch_irq_stat_cpu(i);
d3d64df2 KK	104
	105	for (j = 0; j < NR_SOFTIRQS; j++) {
	106	unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
	107
	108	per_softirq_sums[j] += softirq_stat;
	109	sum_softirq += softirq_stat;
	110	}
df8106db AD	111	}
	112	sum += arch_irq_stat();
	113
1ac101a5 KH	114	seq_puts(p, "cpu ");
	115	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
	116	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
	117	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
	118	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
	119	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
	120	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
	121	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
	122	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
	123	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
	124	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
	125	seq_putc(p, '\n');
	126
df8106db	127	for_each_online_cpu(i) {
df8106db	128	/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
3292beb3 GC	129	user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
	130	nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	131	system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
a25cac51 MH	132	idle = get_idle_time(i);
a25cac51 MH	133	iowait = get_iowait_time(i);
3292beb3 GC	134	irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	135	softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	136	steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	137	guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	138	guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
1ac101a5 KH	139	seq_printf(p, "cpu%d", i);
	140	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
	141	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
	142	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
	143	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
	144	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
	145	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
	146	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
	147	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
	148	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
	149	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
	150	seq_putc(p, '\n');
df8106db AD	151	}
	152	seq_printf(p, "intr %llu", (unsigned long long)sum);
	153
	154	/* sum again ? it could be updated? */
478735e3	155	for_each_irq_nr(j)
1ac101a5	156	seq_put_decimal_ull(p, ' ', kstat_irqs(j));
df8106db AD	157
	158	seq_printf(p,
	159	"\nctxt %llu\n"
	160	"btime %lu\n"
	161	"processes %lu\n"
	162	"procs_running %lu\n"
	163	"procs_blocked %lu\n",
	164	nr_context_switches(),
	165	(unsigned long)jif,
	166	total_forks,
	167	nr_running(),
	168	nr_iowait());
	169
d3d64df2 KK	170	seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
	171
	172	for (i = 0; i < NR_SOFTIRQS; i++)
1ac101a5	173	seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
9d6de12f	174	seq_putc(p, '\n');
d3d64df2	175
df8106db AD	176	return 0;
	177	}
	178
	179	static int stat_open(struct inode inode, struct file file)
	180	{
59a32e2c	181	unsigned size = 1024 + 128 * num_possible_cpus();
df8106db AD	182	char *buf;
	183	struct seq_file *m;
	184	int res;
	185
59a32e2c ED	186	/* minimum size to display an interrupt count : 2 bytes */
	187	size += 2 * nr_irqs;
	188
a4dbf0ec YL	189	/* don't ask for more than the kmalloc() max size */
	190	if (size > KMALLOC_MAX_SIZE)
	191	size = KMALLOC_MAX_SIZE;
df8106db AD	192	buf = kmalloc(size, GFP_KERNEL);
	193	if (!buf)
	194	return -ENOMEM;
	195
	196	res = single_open(file, show_stat, NULL);
	197	if (!res) {
	198	m = file->private_data;
	199	m->buf = buf;
59a32e2c	200	m->size = ksize(buf);
df8106db AD	201	} else
	202	kfree(buf);
	203	return res;
	204	}
	205
	206	static const struct file_operations proc_stat_operations = {
	207	.open = stat_open,
	208	.read = seq_read,
	209	.llseek = seq_lseek,
	210	.release = single_release,
	211	};
	212
	213	static int __init proc_stat_init(void)
	214	{
	215	proc_create("stat", 0, NULL, &proc_stat_operations);
	216	return 0;
	217	}
	218	module_init(proc_stat_init);