#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){	size_t 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);