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1// SPDX-License-Identifier: GPL-2.02#include <linux/cpumask.h>3#include <linux/fs.h>4#include <linux/init.h>5#include <linux/interrupt.h>6#include <linux/kernel_stat.h>7#include <linux/proc_fs.h>8#include <linux/sched.h>9#include <linux/sched/stat.h>10#include <linux/seq_file.h>11#include <linux/slab.h>12#include <linux/time.h>13#include <linux/time_namespace.h>14#include <linux/irqnr.h>15#include <linux/sched/cputime.h>16#include <linux/tick.h>17 18#ifndef arch_irq_stat_cpu19#define arch_irq_stat_cpu(cpu) 020#endif21#ifndef arch_irq_stat22#define arch_irq_stat() 023#endif24 25u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)26{27 u64 idle, idle_usecs = -1ULL;28 29 if (cpu_online(cpu))30 idle_usecs = get_cpu_idle_time_us(cpu, NULL);31 32 if (idle_usecs == -1ULL)33 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */34 idle = kcs->cpustat[CPUTIME_IDLE];35 else36 idle = idle_usecs * NSEC_PER_USEC;37 38 return idle;39}40 41static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)42{43 u64 iowait, iowait_usecs = -1ULL;44 45 if (cpu_online(cpu))46 iowait_usecs = get_cpu_iowait_time_us(cpu, NULL);47 48 if (iowait_usecs == -1ULL)49 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */50 iowait = kcs->cpustat[CPUTIME_IOWAIT];51 else52 iowait = iowait_usecs * NSEC_PER_USEC;53 54 return iowait;55}56 57static void show_irq_gap(struct seq_file *p, unsigned int gap)58{59 static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";60 61 while (gap > 0) {62 unsigned int inc;63 64 inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2);65 seq_write(p, zeros, 2 * inc);66 gap -= inc;67 }68}69 70static void show_all_irqs(struct seq_file *p)71{72 unsigned int i, next = 0;73 74 for_each_active_irq(i) {75 show_irq_gap(p, i - next);76 seq_put_decimal_ull(p, " ", kstat_irqs_usr(i));77 next = i + 1;78 }79 show_irq_gap(p, nr_irqs - next);80}81 82static int show_stat(struct seq_file *p, void *v)83{84 int i, j;85 u64 user, nice, system, idle, iowait, irq, softirq, steal;86 u64 guest, guest_nice;87 u64 sum = 0;88 u64 sum_softirq = 0;89 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};90 struct timespec64 boottime;91 92 user = nice = system = idle = iowait =93 irq = softirq = steal = 0;94 guest = guest_nice = 0;95 getboottime64(&boottime);96 /* shift boot timestamp according to the timens offset */97 timens_sub_boottime(&boottime);98 99 for_each_possible_cpu(i) {100 struct kernel_cpustat kcpustat;101 u64 *cpustat = kcpustat.cpustat;102 103 kcpustat_cpu_fetch(&kcpustat, i);104 105 user += cpustat[CPUTIME_USER];106 nice += cpustat[CPUTIME_NICE];107 system += cpustat[CPUTIME_SYSTEM];108 idle += get_idle_time(&kcpustat, i);109 iowait += get_iowait_time(&kcpustat, i);110 irq += cpustat[CPUTIME_IRQ];111 softirq += cpustat[CPUTIME_SOFTIRQ];112 steal += cpustat[CPUTIME_STEAL];113 guest += cpustat[CPUTIME_GUEST];114 guest_nice += cpustat[CPUTIME_GUEST_NICE];115 sum += kstat_cpu_irqs_sum(i);116 sum += arch_irq_stat_cpu(i);117 118 for (j = 0; j < NR_SOFTIRQS; j++) {119 unsigned int softirq_stat = kstat_softirqs_cpu(j, i);120 121 per_softirq_sums[j] += softirq_stat;122 sum_softirq += softirq_stat;123 }124 }125 sum += arch_irq_stat();126 127 seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user));128 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));129 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));130 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));131 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));132 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));133 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));134 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));135 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));136 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));137 seq_putc(p, '\n');138 139 for_each_online_cpu(i) {140 struct kernel_cpustat kcpustat;141 u64 *cpustat = kcpustat.cpustat;142 143 kcpustat_cpu_fetch(&kcpustat, i);144 145 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */146 user = cpustat[CPUTIME_USER];147 nice = cpustat[CPUTIME_NICE];148 system = cpustat[CPUTIME_SYSTEM];149 idle = get_idle_time(&kcpustat, i);150 iowait = get_iowait_time(&kcpustat, i);151 irq = cpustat[CPUTIME_IRQ];152 softirq = cpustat[CPUTIME_SOFTIRQ];153 steal = cpustat[CPUTIME_STEAL];154 guest = cpustat[CPUTIME_GUEST];155 guest_nice = cpustat[CPUTIME_GUEST_NICE];156 seq_printf(p, "cpu%d", i);157 seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));158 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));159 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));160 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));161 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));162 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));163 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));164 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));165 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));166 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));167 seq_putc(p, '\n');168 }169 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);170 171 show_all_irqs(p);172 173 seq_printf(p,174 "\nctxt %llu\n"175 "btime %llu\n"176 "processes %lu\n"177 "procs_running %u\n"178 "procs_blocked %u\n",179 nr_context_switches(),180 (unsigned long long)boottime.tv_sec,181 total_forks,182 nr_running(),183 nr_iowait());184 185 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);186 187 for (i = 0; i < NR_SOFTIRQS; i++)188 seq_put_decimal_ull(p, " ", per_softirq_sums[i]);189 seq_putc(p, '\n');190 191 return 0;192}193 194static int stat_open(struct inode *inode, struct file *file)195{196 unsigned int size = 1024 + 128 * num_online_cpus();197 198 /* minimum size to display an interrupt count : 2 bytes */199 size += 2 * nr_irqs;200 return single_open_size(file, show_stat, NULL, size);201}202 203static const struct proc_ops stat_proc_ops = {204 .proc_flags = PROC_ENTRY_PERMANENT,205 .proc_open = stat_open,206 .proc_read_iter = seq_read_iter,207 .proc_lseek = seq_lseek,208 .proc_release = single_release,209};210 211static int __init proc_stat_init(void)212{213 proc_create("stat", 0, NULL, &stat_proc_ops);214 return 0;215}216fs_initcall(proc_stat_init);217