1// SPDX-License-Identifier: GPL-2.0 2#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_cpu 19#define arch_irq_stat_cpu(cpu) 0 20#endif 21#ifndef arch_irq_stat 22#define arch_irq_stat() 0 23#endif 24 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 else 36 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 else 52 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