[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 <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
#ifndef arch_idle_time
#define arch_idle_time(cpu) 0
#endif

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];
		idle += arch_idle_time(cpu);
	} 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;
}

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_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu "
		"%llu\n",
		(unsigned long long)cputime64_to_clock_t(user),
		(unsigned long long)cputime64_to_clock_t(nice),
		(unsigned long long)cputime64_to_clock_t(system),
		(unsigned long long)cputime64_to_clock_t(idle),
		(unsigned long long)cputime64_to_clock_t(iowait),
		(unsigned long long)cputime64_to_clock_t(irq),
		(unsigned long long)cputime64_to_clock_t(softirq),
		(unsigned long long)cputime64_to_clock_t(steal),
		(unsigned long long)cputime64_to_clock_t(guest),
		(unsigned long long)cputime64_to_clock_t(guest_nice));
	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 %llu %llu %llu %llu %llu %llu %llu %llu %llu "
			"%llu\n",
			i,
			(unsigned long long)cputime64_to_clock_t(user),
			(unsigned long long)cputime64_to_clock_t(nice),
			(unsigned long long)cputime64_to_clock_t(system),
			(unsigned long long)cputime64_to_clock_t(idle),
			(unsigned long long)cputime64_to_clock_t(iowait),
			(unsigned long long)cputime64_to_clock_t(irq),
			(unsigned long long)cputime64_to_clock_t(softirq),
			(unsigned long long)cputime64_to_clock_t(steal),
			(unsigned long long)cputime64_to_clock_t(guest),
			(unsigned long long)cputime64_to_clock_t(guest_nice));
	}
	seq_printf(p, "intr %llu", (unsigned long long)sum);

	/* sum again ? it could be updated? */
	for_each_irq_nr(j)
		seq_printf(p, " %u", 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_printf(p, " %u", per_softirq_sums[i]);
	seq_putc(p, '\n');

	return 0;
}

static int stat_open(struct inode *inode, struct file *file)
{
	unsigned size = 4096 * (1 + num_possible_cpus() / 32);
	char *buf;
	struct seq_file *m;
	int res;

	/* 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 = size;
	} 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
e1c80530 MS	21	#ifndef arch_idle_time
	22	#define arch_idle_time(cpu) 0
	23	#endif
df8106db	24
3292beb3	25	static u64 get_idle_time(int cpu)
a25cac51	26	{
3292beb3	27	u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);
a25cac51 MH	28
	29	if (idle_time == -1ULL) {
	30	/* !NO_HZ so we can rely on cpustat.idle */
3292beb3 GC	31	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
3292beb3 GC	32	idle += arch_idle_time(cpu);
a25cac51	33	} else
34845636	34	idle = usecs_to_cputime64(idle_time);
a25cac51 MH	35
	36	return idle;
	37	}
	38
3292beb3	39	static u64 get_iowait_time(int cpu)
a25cac51	40	{
3292beb3	41	u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL);
a25cac51 MH	42
	43	if (iowait_time == -1ULL)
	44	/* !NO_HZ so we can rely on cpustat.iowait */
3292beb3	45	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
a25cac51	46	else
34845636	47	iowait = usecs_to_cputime64(iowait_time);
a25cac51 MH	48
	49	return iowait;
	50	}
	51
df8106db AD	52	static int show_stat(struct seq_file p, void v)
	53	{
	54	int i, j;
	55	unsigned long jif;
3292beb3 GC	56	u64 user, nice, system, idle, iowait, irq, softirq, steal;
3292beb3 GC	57	u64 guest, guest_nice;
df8106db	58	u64 sum = 0;
d3d64df2 KK	59	u64 sum_softirq = 0;
d3d64df2 KK	60	unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
df8106db	61	struct timespec boottime;
df8106db AD	62
df8106db AD	63	user = nice = system = idle = iowait =
3292beb3 GC	64	irq = softirq = steal = 0;
3292beb3 GC	65	guest = guest_nice = 0;
df8106db AD	66	getboottime(&boottime);
	67	jif = boottime.tv_sec;
	68
	69	for_each_possible_cpu(i) {
3292beb3 GC	70	user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
	71	nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	72	system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
	73	idle += get_idle_time(i);
	74	iowait += get_iowait_time(i);
	75	irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	76	softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	77	steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	78	guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	79	guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
f7e6746e RK	80	sum += kstat_cpu_irqs_sum(i);
f7e6746e RK	81	sum += arch_irq_stat_cpu(i);
d3d64df2 KK	82
	83	for (j = 0; j < NR_SOFTIRQS; j++) {
	84	unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
	85
	86	per_softirq_sums[j] += softirq_stat;
	87	sum_softirq += softirq_stat;
	88	}
df8106db AD	89	}
	90	sum += arch_irq_stat();
	91
ce0e7b28 RO	92	seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu "
ce0e7b28 RO	93	"%llu\n",
df8106db AD	94	(unsigned long long)cputime64_to_clock_t(user),
	95	(unsigned long long)cputime64_to_clock_t(nice),
	96	(unsigned long long)cputime64_to_clock_t(system),
	97	(unsigned long long)cputime64_to_clock_t(idle),
	98	(unsigned long long)cputime64_to_clock_t(iowait),
	99	(unsigned long long)cputime64_to_clock_t(irq),
	100	(unsigned long long)cputime64_to_clock_t(softirq),
	101	(unsigned long long)cputime64_to_clock_t(steal),
ce0e7b28 RO	102	(unsigned long long)cputime64_to_clock_t(guest),
ce0e7b28 RO	103	(unsigned long long)cputime64_to_clock_t(guest_nice));
df8106db	104	for_each_online_cpu(i) {
df8106db	105	/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
3292beb3 GC	106	user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
	107	nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	108	system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
a25cac51 MH	109	idle = get_idle_time(i);
a25cac51 MH	110	iowait = get_iowait_time(i);
3292beb3 GC	111	irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	112	softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	113	steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	114	guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	115	guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
df8106db	116	seq_printf(p,
ce0e7b28 RO	117	"cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
ce0e7b28 RO	118	"%llu\n",
df8106db AD	119	i,
	120	(unsigned long long)cputime64_to_clock_t(user),
	121	(unsigned long long)cputime64_to_clock_t(nice),
	122	(unsigned long long)cputime64_to_clock_t(system),
	123	(unsigned long long)cputime64_to_clock_t(idle),
	124	(unsigned long long)cputime64_to_clock_t(iowait),
	125	(unsigned long long)cputime64_to_clock_t(irq),
	126	(unsigned long long)cputime64_to_clock_t(softirq),
	127	(unsigned long long)cputime64_to_clock_t(steal),
ce0e7b28 RO	128	(unsigned long long)cputime64_to_clock_t(guest),
ce0e7b28 RO	129	(unsigned long long)cputime64_to_clock_t(guest_nice));
df8106db AD	130	}
	131	seq_printf(p, "intr %llu", (unsigned long long)sum);
	132
	133	/* sum again ? it could be updated? */
478735e3 KH	134	for_each_irq_nr(j)
478735e3 KH	135	seq_printf(p, " %u", kstat_irqs(j));
df8106db AD	136
	137	seq_printf(p,
	138	"\nctxt %llu\n"
	139	"btime %lu\n"
	140	"processes %lu\n"
	141	"procs_running %lu\n"
	142	"procs_blocked %lu\n",
	143	nr_context_switches(),
	144	(unsigned long)jif,
	145	total_forks,
	146	nr_running(),
	147	nr_iowait());
	148
d3d64df2 KK	149	seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
	150
	151	for (i = 0; i < NR_SOFTIRQS; i++)
	152	seq_printf(p, " %u", per_softirq_sums[i]);
9d6de12f	153	seq_putc(p, '\n');
d3d64df2	154
df8106db AD	155	return 0;
	156	}
	157
	158	static int stat_open(struct inode inode, struct file file)
	159	{
	160	unsigned size = 4096 * (1 + num_possible_cpus() / 32);
	161	char *buf;
	162	struct seq_file *m;
	163	int res;
	164
a4dbf0ec YL	165	/* don't ask for more than the kmalloc() max size */
	166	if (size > KMALLOC_MAX_SIZE)
	167	size = KMALLOC_MAX_SIZE;
df8106db AD	168	buf = kmalloc(size, GFP_KERNEL);
	169	if (!buf)
	170	return -ENOMEM;
	171
	172	res = single_open(file, show_stat, NULL);
	173	if (!res) {
	174	m = file->private_data;
	175	m->buf = buf;
	176	m->size = size;
	177	} else
	178	kfree(buf);
	179	return res;
	180	}
	181
	182	static const struct file_operations proc_stat_operations = {
	183	.open = stat_open,
	184	.read = seq_read,
	185	.llseek = seq_lseek,
	186	.release = single_release,
	187	};
	188
	189	static int __init proc_stat_init(void)
	190	{
	191	proc_create("stat", 0, NULL, &proc_stat_operations);
	192	return 0;
	193	}
	194	module_init(proc_stat_init);