#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 cputime64_t get_idle_time(int cpu){	u64 idle_time = get_cpu_idle_time_us(cpu, NULL);	cputime64_t idle; 	if (idle_time == -1ULL) {		/* !NO_HZ so we can rely on cpustat.idle */		idle = kstat_cpu(cpu).cpustat.idle;		idle = cputime64_add(idle, arch_idle_time(cpu));	} else		idle = usecs_to_cputime64(idle_time); 	return idle;} static cputime64_t get_iowait_time(int cpu){	u64 iowait_time = get_cpu_iowait_time_us(cpu, NULL);	cputime64_t iowait; 	if (iowait_time == -1ULL)		/* !NO_HZ so we can rely on cpustat.iowait */		iowait = kstat_cpu(cpu).cpustat.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;	cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;	cputime64_t 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 = cputime64_zero;	guest = guest_nice = cputime64_zero;	getboottime(&boottime);	jif = boottime.tv_sec; 	for_each_possible_cpu(i) {		user = cputime64_add(user, kstat_cpu(i).cpustat.user);		nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);		system = cputime64_add(system, kstat_cpu(i).cpustat.system);		idle = cputime64_add(idle, get_idle_time(i));		iowait = cputime64_add(iowait, get_iowait_time(i));		irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);		softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);		steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);		guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);		guest_nice = cputime64_add(guest_nice,			kstat_cpu(i).cpustat.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 = kstat_cpu(i).cpustat.user;		nice = kstat_cpu(i).cpustat.nice;		system = kstat_cpu(i).cpustat.system;		idle = get_idle_time(i);		iowait = get_iowait_time(i);		irq = kstat_cpu(i).cpustat.irq;		softirq = kstat_cpu(i).cpustat.softirq;		steal = kstat_cpu(i).cpustat.steal;		guest = kstat_cpu(i).cpustat.guest;		guest_nice = kstat_cpu(i).cpustat.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);