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/irqnr.h> 14#include <linux/sched/cputime.h> 15#include <linux/tick.h> 16 17#ifndef arch_irq_stat_cpu 18#define arch_irq_stat_cpu(cpu) 0 19#endif 20#ifndef arch_irq_stat 21#define arch_irq_stat() 0 22#endif 23 24#ifdef arch_idle_time 25 26u64 get_idle_time(struct kernel_cpustat *kcs, int cpu) 27{ 28 u64 idle; 29 30 idle = kcs->cpustat[CPUTIME_IDLE]; 31 if (cpu_online(cpu) && !nr_iowait_cpu(cpu)) 32 idle += arch_idle_time(cpu); 33 return idle; 34} 35 36static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu) 37{ 38 u64 iowait; 39 40 iowait = kcs->cpustat[CPUTIME_IOWAIT]; 41 if (cpu_online(cpu) && nr_iowait_cpu(cpu)) 42 iowait += arch_idle_time(cpu); 43 return iowait; 44} 45 46#else 47 48u64 get_idle_time(struct kernel_cpustat *kcs, int cpu) 49{ 50 u64 idle, idle_usecs = -1ULL; 51 52 if (cpu_online(cpu)) 53 idle_usecs = get_cpu_idle_time_us(cpu, NULL); 54 55 if (idle_usecs == -1ULL) 56 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */ 57 idle = kcs->cpustat[CPUTIME_IDLE]; 58 else 59 idle = idle_usecs * NSEC_PER_USEC; 60 61 return idle; 62} 63 64static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu) 65{ 66 u64 iowait, iowait_usecs = -1ULL; 67 68 if (cpu_online(cpu)) 69 iowait_usecs = get_cpu_iowait_time_us(cpu, NULL); 70 71 if (iowait_usecs == -1ULL) 72 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */ 73 iowait = kcs->cpustat[CPUTIME_IOWAIT]; 74 else 75 iowait = iowait_usecs * NSEC_PER_USEC; 76 77 return iowait; 78} 79 80#endif 81 82static void show_irq_gap(struct seq_file *p, unsigned int gap) 83{ 84 static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"; 85 86 while (gap > 0) { 87 unsigned int inc; 88 89 inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2); 90 seq_write(p, zeros, 2 * inc); 91 gap -= inc; 92 } 93} 94 95static void show_all_irqs(struct seq_file *p) 96{ 97 unsigned int i, next = 0; 98 99 for_each_active_irq(i) { 100 show_irq_gap(p, i - next); 101 seq_put_decimal_ull(p, " ", kstat_irqs_usr(i)); 102 next = i + 1; 103 } 104 show_irq_gap(p, nr_irqs - next); 105} 106 107static int show_stat(struct seq_file *p, void *v) 108{ 109 int i, j; 110 u64 user, nice, system, idle, iowait, irq, softirq, steal; 111 u64 guest, guest_nice; 112 u64 sum = 0; 113 u64 sum_softirq = 0; 114 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; 115 struct timespec64 boottime; 116 117 user = nice = system = idle = iowait = 118 irq = softirq = steal = 0; 119 guest = guest_nice = 0; 120 getboottime64(&boottime); 121 122 for_each_possible_cpu(i) { 123 struct kernel_cpustat kcpustat; 124 u64 *cpustat = kcpustat.cpustat; 125 126 kcpustat_cpu_fetch(&kcpustat, i); 127 128 user += cpustat[CPUTIME_USER]; 129 nice += cpustat[CPUTIME_NICE]; 130 system += cpustat[CPUTIME_SYSTEM]; 131 idle += get_idle_time(&kcpustat, i); 132 iowait += get_iowait_time(&kcpustat, i); 133 irq += cpustat[CPUTIME_IRQ]; 134 softirq += cpustat[CPUTIME_SOFTIRQ]; 135 steal += cpustat[CPUTIME_STEAL]; 136 guest += cpustat[CPUTIME_GUEST]; 137 guest_nice += cpustat[CPUTIME_GUEST_NICE]; 138 sum += kstat_cpu_irqs_sum(i); 139 sum += arch_irq_stat_cpu(i); 140 141 for (j = 0; j < NR_SOFTIRQS; j++) { 142 unsigned int softirq_stat = kstat_softirqs_cpu(j, i); 143 144 per_softirq_sums[j] += softirq_stat; 145 sum_softirq += softirq_stat; 146 } 147 } 148 sum += arch_irq_stat(); 149 150 seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user)); 151 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); 152 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system)); 153 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle)); 154 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait)); 155 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq)); 156 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); 157 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal)); 158 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest)); 159 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice)); 160 seq_putc(p, '\n'); 161 162 for_each_online_cpu(i) { 163 struct kernel_cpustat kcpustat; 164 u64 *cpustat = kcpustat.cpustat; 165 166 kcpustat_cpu_fetch(&kcpustat, i); 167 168 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 169 user = cpustat[CPUTIME_USER]; 170 nice = cpustat[CPUTIME_NICE]; 171 system = cpustat[CPUTIME_SYSTEM]; 172 idle = get_idle_time(&kcpustat, i); 173 iowait = get_iowait_time(&kcpustat, i); 174 irq = cpustat[CPUTIME_IRQ]; 175 softirq = cpustat[CPUTIME_SOFTIRQ]; 176 steal = cpustat[CPUTIME_STEAL]; 177 guest = cpustat[CPUTIME_GUEST]; 178 guest_nice = cpustat[CPUTIME_GUEST_NICE]; 179 seq_printf(p, "cpu%d", i); 180 seq_put_decimal_ull(p, " ", nsec_to_clock_t(user)); 181 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); 182 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system)); 183 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle)); 184 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait)); 185 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq)); 186 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); 187 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal)); 188 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest)); 189 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice)); 190 seq_putc(p, '\n'); 191 } 192 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum); 193 194 show_all_irqs(p); 195 196 seq_printf(p, 197 "\nctxt %llu\n" 198 "btime %llu\n" 199 "processes %lu\n" 200 "procs_running %lu\n" 201 "procs_blocked %lu\n", 202 nr_context_switches(), 203 (unsigned long long)boottime.tv_sec, 204 total_forks, 205 nr_running(), 206 nr_iowait()); 207 208 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq); 209 210 for (i = 0; i < NR_SOFTIRQS; i++) 211 seq_put_decimal_ull(p, " ", per_softirq_sums[i]); 212 seq_putc(p, '\n'); 213 214 return 0; 215} 216 217static int stat_open(struct inode *inode, struct file *file) 218{ 219 unsigned int size = 1024 + 128 * num_online_cpus(); 220 221 /* minimum size to display an interrupt count : 2 bytes */ 222 size += 2 * nr_irqs; 223 return single_open_size(file, show_stat, NULL, size); 224} 225 226static const struct proc_ops stat_proc_ops = { 227 .proc_flags = PROC_ENTRY_PERMANENT, 228 .proc_open = stat_open, 229 .proc_read_iter = seq_read_iter, 230 .proc_lseek = seq_lseek, 231 .proc_release = single_release, 232}; 233 234static int __init proc_stat_init(void) 235{ 236 proc_create("stat", 0, NULL, &stat_proc_ops); 237 return 0; 238} 239fs_initcall(proc_stat_init); 240