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 26 static u64 get_idle_time(int cpu) 27 { 28 u64 idle; 29 30 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; 31 if (cpu_online(cpu) && !nr_iowait_cpu(cpu)) 32 idle += arch_idle_time(cpu); 33 return idle; 34 } 35 36 static u64 get_iowait_time(int cpu) 37 { 38 u64 iowait; 39 40 iowait = kcpustat_cpu(cpu).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 48 static u64 get_idle_time(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 = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; 58 else 59 idle = idle_usecs * NSEC_PER_USEC; 60 61 return idle; 62 } 63 64 static u64 get_iowait_time(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 = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; 74 else 75 iowait = iowait_usecs * NSEC_PER_USEC; 76 77 return iowait; 78 } 79 80 #endif 81 82 static 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 97 for_each_possible_cpu(i) { 98 user += kcpustat_cpu(i).cpustat[CPUTIME_USER]; 99 nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 100 system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 101 idle += get_idle_time(i); 102 iowait += get_iowait_time(i); 103 irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 104 softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 105 steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 106 guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 107 guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE]; 108 sum += kstat_cpu_irqs_sum(i); 109 sum += arch_irq_stat_cpu(i); 110 111 for (j = 0; j < NR_SOFTIRQS; j++) { 112 unsigned int softirq_stat = kstat_softirqs_cpu(j, i); 113 114 per_softirq_sums[j] += softirq_stat; 115 sum_softirq += softirq_stat; 116 } 117 } 118 sum += arch_irq_stat(); 119 120 seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user)); 121 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); 122 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system)); 123 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle)); 124 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait)); 125 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq)); 126 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); 127 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal)); 128 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest)); 129 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice)); 130 seq_putc(p, '\n'); 131 132 for_each_online_cpu(i) { 133 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 134 user = kcpustat_cpu(i).cpustat[CPUTIME_USER]; 135 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 136 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 137 idle = get_idle_time(i); 138 iowait = get_iowait_time(i); 139 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 140 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 141 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 142 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 143 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE]; 144 seq_printf(p, "cpu%d", i); 145 seq_put_decimal_ull(p, " ", nsec_to_clock_t(user)); 146 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); 147 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system)); 148 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle)); 149 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait)); 150 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq)); 151 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); 152 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal)); 153 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest)); 154 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice)); 155 seq_putc(p, '\n'); 156 } 157 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum); 158 159 /* sum again ? it could be updated? */ 160 for_each_irq_nr(j) 161 seq_put_decimal_ull(p, " ", kstat_irqs_usr(j)); 162 163 seq_printf(p, 164 "\nctxt %llu\n" 165 "btime %llu\n" 166 "processes %lu\n" 167 "procs_running %lu\n" 168 "procs_blocked %lu\n", 169 nr_context_switches(), 170 (unsigned long long)boottime.tv_sec, 171 total_forks, 172 nr_running(), 173 nr_iowait()); 174 175 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq); 176 177 for (i = 0; i < NR_SOFTIRQS; i++) 178 seq_put_decimal_ull(p, " ", per_softirq_sums[i]); 179 seq_putc(p, '\n'); 180 181 return 0; 182 } 183 184 static int stat_open(struct inode *inode, struct file *file) 185 { 186 size_t size = 1024 + 128 * num_online_cpus(); 187 188 /* minimum size to display an interrupt count : 2 bytes */ 189 size += 2 * nr_irqs; 190 return single_open_size(file, show_stat, NULL, size); 191 } 192 193 static const struct file_operations proc_stat_operations = { 194 .open = stat_open, 195 .read = seq_read, 196 .llseek = seq_lseek, 197 .release = single_release, 198 }; 199 200 static int __init proc_stat_init(void) 201 { 202 proc_create("stat", 0, NULL, &proc_stat_operations); 203 return 0; 204 } 205 fs_initcall(proc_stat_init); 206