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 25 #ifdef arch_idle_time 26 27 static u64 get_idle_time(struct kernel_cpustat *kcs, int cpu) 28 { 29 u64 idle; 30 31 idle = kcs->cpustat[CPUTIME_IDLE]; 32 if (cpu_online(cpu) && !nr_iowait_cpu(cpu)) 33 idle += arch_idle_time(cpu); 34 return idle; 35 } 36 37 static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu) 38 { 39 u64 iowait; 40 41 iowait = kcs->cpustat[CPUTIME_IOWAIT]; 42 if (cpu_online(cpu) && nr_iowait_cpu(cpu)) 43 iowait += arch_idle_time(cpu); 44 return iowait; 45 } 46 47 #else 48 49 static u64 get_idle_time(struct kernel_cpustat *kcs, int cpu) 50 { 51 u64 idle, idle_usecs = -1ULL; 52 53 if (cpu_online(cpu)) 54 idle_usecs = get_cpu_idle_time_us(cpu, NULL); 55 56 if (idle_usecs == -1ULL) 57 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */ 58 idle = kcs->cpustat[CPUTIME_IDLE]; 59 else 60 idle = idle_usecs * NSEC_PER_USEC; 61 62 return idle; 63 } 64 65 static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu) 66 { 67 u64 iowait, iowait_usecs = -1ULL; 68 69 if (cpu_online(cpu)) 70 iowait_usecs = get_cpu_iowait_time_us(cpu, NULL); 71 72 if (iowait_usecs == -1ULL) 73 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */ 74 iowait = kcs->cpustat[CPUTIME_IOWAIT]; 75 else 76 iowait = iowait_usecs * NSEC_PER_USEC; 77 78 return iowait; 79 } 80 81 #endif 82 83 static void show_irq_gap(struct seq_file *p, unsigned int gap) 84 { 85 static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"; 86 87 while (gap > 0) { 88 unsigned int inc; 89 90 inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2); 91 seq_write(p, zeros, 2 * inc); 92 gap -= inc; 93 } 94 } 95 96 static void show_all_irqs(struct seq_file *p) 97 { 98 unsigned int i, next = 0; 99 100 for_each_active_irq(i) { 101 show_irq_gap(p, i - next); 102 seq_put_decimal_ull(p, " ", kstat_irqs_usr(i)); 103 next = i + 1; 104 } 105 show_irq_gap(p, nr_irqs - next); 106 } 107 108 static int show_stat(struct seq_file *p, void *v) 109 { 110 int i, j; 111 u64 user, nice, system, idle, iowait, irq, softirq, steal; 112 u64 guest, guest_nice; 113 u64 sum = 0; 114 u64 sum_softirq = 0; 115 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; 116 struct timespec64 boottime; 117 118 user = nice = system = idle = iowait = 119 irq = softirq = steal = 0; 120 guest = guest_nice = 0; 121 getboottime64(&boottime); 122 /* shift boot timestamp according to the timens offset */ 123 timens_sub_boottime(&boottime); 124 125 for_each_possible_cpu(i) { 126 struct kernel_cpustat kcpustat; 127 u64 *cpustat = kcpustat.cpustat; 128 129 kcpustat_cpu_fetch(&kcpustat, i); 130 131 user += cpustat[CPUTIME_USER]; 132 nice += cpustat[CPUTIME_NICE]; 133 system += cpustat[CPUTIME_SYSTEM]; 134 idle += get_idle_time(&kcpustat, i); 135 iowait += get_iowait_time(&kcpustat, i); 136 irq += cpustat[CPUTIME_IRQ]; 137 softirq += cpustat[CPUTIME_SOFTIRQ]; 138 steal += cpustat[CPUTIME_STEAL]; 139 guest += cpustat[CPUTIME_GUEST]; 140 guest_nice += cpustat[CPUTIME_GUEST_NICE]; 141 sum += kstat_cpu_irqs_sum(i); 142 sum += arch_irq_stat_cpu(i); 143 144 for (j = 0; j < NR_SOFTIRQS; j++) { 145 unsigned int softirq_stat = kstat_softirqs_cpu(j, i); 146 147 per_softirq_sums[j] += softirq_stat; 148 sum_softirq += softirq_stat; 149 } 150 } 151 sum += arch_irq_stat(); 152 153 seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user)); 154 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); 155 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system)); 156 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle)); 157 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait)); 158 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq)); 159 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); 160 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal)); 161 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest)); 162 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice)); 163 seq_putc(p, '\n'); 164 165 for_each_online_cpu(i) { 166 struct kernel_cpustat kcpustat; 167 u64 *cpustat = kcpustat.cpustat; 168 169 kcpustat_cpu_fetch(&kcpustat, i); 170 171 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 172 user = cpustat[CPUTIME_USER]; 173 nice = cpustat[CPUTIME_NICE]; 174 system = cpustat[CPUTIME_SYSTEM]; 175 idle = get_idle_time(&kcpustat, i); 176 iowait = get_iowait_time(&kcpustat, i); 177 irq = cpustat[CPUTIME_IRQ]; 178 softirq = cpustat[CPUTIME_SOFTIRQ]; 179 steal = cpustat[CPUTIME_STEAL]; 180 guest = cpustat[CPUTIME_GUEST]; 181 guest_nice = cpustat[CPUTIME_GUEST_NICE]; 182 seq_printf(p, "cpu%d", i); 183 seq_put_decimal_ull(p, " ", nsec_to_clock_t(user)); 184 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); 185 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system)); 186 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle)); 187 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait)); 188 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq)); 189 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); 190 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal)); 191 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest)); 192 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice)); 193 seq_putc(p, '\n'); 194 } 195 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum); 196 197 show_all_irqs(p); 198 199 seq_printf(p, 200 "\nctxt %llu\n" 201 "btime %llu\n" 202 "processes %lu\n" 203 "procs_running %lu\n" 204 "procs_blocked %lu\n", 205 nr_context_switches(), 206 (unsigned long long)boottime.tv_sec, 207 total_forks, 208 nr_running(), 209 nr_iowait()); 210 211 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq); 212 213 for (i = 0; i < NR_SOFTIRQS; i++) 214 seq_put_decimal_ull(p, " ", per_softirq_sums[i]); 215 seq_putc(p, '\n'); 216 217 return 0; 218 } 219 220 static int stat_open(struct inode *inode, struct file *file) 221 { 222 unsigned int size = 1024 + 128 * num_online_cpus(); 223 224 /* minimum size to display an interrupt count : 2 bytes */ 225 size += 2 * nr_irqs; 226 return single_open_size(file, show_stat, NULL, size); 227 } 228 229 static const struct proc_ops stat_proc_ops = { 230 .proc_flags = PROC_ENTRY_PERMANENT, 231 .proc_open = stat_open, 232 .proc_read_iter = seq_read_iter, 233 .proc_lseek = seq_lseek, 234 .proc_release = single_release, 235 }; 236 237 static int __init proc_stat_init(void) 238 { 239 proc_create("stat", 0, NULL, &stat_proc_ops); 240 return 0; 241 } 242 fs_initcall(proc_stat_init); 243