[GitHub/mt8127/android_kernel_alcatel_ttab.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 = -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(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	{
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;
	83	unsigned long jif;
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};
df8106db	89	struct timespec 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;
df8106db AD	94	getboottime(&boottime);
	95	jif = boottime.tv_sec;
	96
	97	for_each_possible_cpu(i) {
3292beb3 GC	98	user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
	99	nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	100	system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
	101	idle += get_idle_time(i);
	102	iowait += get_iowait_time(i);
	103	irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	104	softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	105	steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	106	guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	107	guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
f7e6746e RK	108	sum += kstat_cpu_irqs_sum(i);
f7e6746e RK	109	sum += arch_irq_stat_cpu(i);
d3d64df2 KK	110
	111	for (j = 0; j < NR_SOFTIRQS; j++) {
	112	unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
	113
	114	per_softirq_sums[j] += softirq_stat;
	115	sum_softirq += softirq_stat;
	116	}
df8106db AD	117	}
	118	sum += arch_irq_stat();
	119
1ac101a5 KH	120	seq_puts(p, "cpu ");
	121	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
	122	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
	123	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
	124	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
	125	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
	126	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
	127	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
	128	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
	129	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
	130	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
	131	seq_putc(p, '\n');
	132
df8106db	133	for_each_online_cpu(i) {
df8106db	134	/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
3292beb3 GC	135	user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
	136	nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
	137	system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
a25cac51 MH	138	idle = get_idle_time(i);
a25cac51 MH	139	iowait = get_iowait_time(i);
3292beb3 GC	140	irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
	141	softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
	142	steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
	143	guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
	144	guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
1ac101a5 KH	145	seq_printf(p, "cpu%d", i);
	146	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
	147	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
	148	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
	149	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
	150	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
	151	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
	152	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
	153	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
	154	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
	155	seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
	156	seq_putc(p, '\n');
df8106db AD	157	}
	158	seq_printf(p, "intr %llu", (unsigned long long)sum);
	159
	160	/* sum again ? it could be updated? */
478735e3	161	for_each_irq_nr(j)
1ac101a5	162	seq_put_decimal_ull(p, ' ', kstat_irqs(j));
df8106db AD	163
	164	seq_printf(p,
	165	"\nctxt %llu\n"
	166	"btime %lu\n"
	167	"processes %lu\n"
	168	"procs_running %lu\n"
	169	"procs_blocked %lu\n",
	170	nr_context_switches(),
	171	(unsigned long)jif,
	172	total_forks,
	173	nr_running(),
	174	nr_iowait());
	175
d3d64df2 KK	176	seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
	177
	178	for (i = 0; i < NR_SOFTIRQS; i++)
1ac101a5	179	seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
9d6de12f	180	seq_putc(p, '\n');
d3d64df2	181
df8106db AD	182	return 0;
	183	}
	184
	185	static int stat_open(struct inode inode, struct file file)
	186	{
59a32e2c	187	unsigned size = 1024 + 128 * num_possible_cpus();
df8106db AD	188	char *buf;
	189	struct seq_file *m;
	190	int res;
	191
59a32e2c ED	192	/* minimum size to display an interrupt count : 2 bytes */
	193	size += 2 * nr_irqs;
	194
a4dbf0ec YL	195	/* don't ask for more than the kmalloc() max size */
	196	if (size > KMALLOC_MAX_SIZE)
	197	size = KMALLOC_MAX_SIZE;
df8106db AD	198	buf = kmalloc(size, GFP_KERNEL);
	199	if (!buf)
	200	return -ENOMEM;
	201
	202	res = single_open(file, show_stat, NULL);
	203	if (!res) {
	204	m = file->private_data;
	205	m->buf = buf;
59a32e2c	206	m->size = ksize(buf);
df8106db AD	207	} else
	208	kfree(buf);
	209	return res;
	210	}
	211
	212	static const struct file_operations proc_stat_operations = {
	213	.open = stat_open,
	214	.read = seq_read,
	215	.llseek = seq_lseek,
	216	.release = single_release,
	217	};
	218
	219	static int __init proc_stat_init(void)
	220	{
	221	proc_create("stat", 0, NULL, &proc_stat_operations);
	222	return 0;
	223	}
	224	module_init(proc_stat_init);