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 22 static void show_irq_gap(struct seq_file *p, unsigned int gap) 23 { 24 static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"; 25 26 while (gap > 0) { 27 unsigned int inc; 28 29 inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2); 30 seq_write(p, zeros, 2 * inc); 31 gap -= inc; 32 } 33 } 34 35 static void show_all_irqs(struct seq_file *p) 36 { 37 unsigned int i, next = 0; 38 39 for_each_active_irq(i) { 40 show_irq_gap(p, i - next); 41 seq_put_decimal_ull(p, " ", kstat_irqs_usr(i)); 42 next = i + 1; 43 } 44 show_irq_gap(p, irq_get_nr_irqs() - next); 45 } 46 47 static int show_stat(struct seq_file *p, void *v) 48 { 49 int i, j; 50 u64 user, nice, system, idle, iowait, irq, softirq, steal; 51 u64 guest, guest_nice; 52 u64 sum = 0; 53 u64 sum_softirq = 0; 54 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; 55 struct timespec64 boottime; 56 57 user = nice = system = idle = iowait = 58 irq = softirq = steal = 0; 59 guest = guest_nice = 0; 60 getboottime64(&boottime); 61 /* shift boot timestamp according to the timens offset */ 62 timens_sub_boottime(&boottime); 63 64 for_each_possible_cpu(i) { 65 struct kernel_cpustat kcpustat; 66 u64 *cpustat = kcpustat.cpustat; 67 68 kcpustat_cpu_fetch(&kcpustat, i); 69 70 user += cpustat[CPUTIME_USER]; 71 nice += cpustat[CPUTIME_NICE]; 72 system += cpustat[CPUTIME_SYSTEM]; 73 idle += cpustat[CPUTIME_IDLE]; 74 iowait += cpustat[CPUTIME_IOWAIT]; 75 irq += cpustat[CPUTIME_IRQ]; 76 softirq += cpustat[CPUTIME_SOFTIRQ]; 77 steal += cpustat[CPUTIME_STEAL]; 78 guest += cpustat[CPUTIME_GUEST]; 79 guest_nice += cpustat[CPUTIME_GUEST_NICE]; 80 sum += kstat_cpu_irqs_sum(i); 81 sum += arch_irq_stat_cpu(i); 82 83 for (j = 0; j < NR_SOFTIRQS; j++) { 84 unsigned int softirq_stat = kstat_softirqs_cpu(j, i); 85 86 per_softirq_sums[j] += softirq_stat; 87 sum_softirq += softirq_stat; 88 } 89 } 90 91 seq_put_decimal_ull(p, "cpu ", nsec_to_clock_t(user)); 92 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); 93 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system)); 94 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle)); 95 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait)); 96 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq)); 97 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); 98 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal)); 99 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest)); 100 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice)); 101 seq_putc(p, '\n'); 102 103 for_each_online_cpu(i) { 104 struct kernel_cpustat kcpustat; 105 u64 *cpustat = kcpustat.cpustat; 106 107 kcpustat_cpu_fetch(&kcpustat, i); 108 109 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 110 user = cpustat[CPUTIME_USER]; 111 nice = cpustat[CPUTIME_NICE]; 112 system = cpustat[CPUTIME_SYSTEM]; 113 idle = cpustat[CPUTIME_IDLE]; 114 iowait = cpustat[CPUTIME_IOWAIT]; 115 irq = cpustat[CPUTIME_IRQ]; 116 softirq = cpustat[CPUTIME_SOFTIRQ]; 117 steal = cpustat[CPUTIME_STEAL]; 118 guest = cpustat[CPUTIME_GUEST]; 119 guest_nice = cpustat[CPUTIME_GUEST_NICE]; 120 seq_printf(p, "cpu%d", i); 121 seq_put_decimal_ull(p, " ", nsec_to_clock_t(user)); 122 seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice)); 123 seq_put_decimal_ull(p, " ", nsec_to_clock_t(system)); 124 seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle)); 125 seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait)); 126 seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq)); 127 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); 128 seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal)); 129 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest)); 130 seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice)); 131 seq_putc(p, '\n'); 132 } 133 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum); 134 135 show_all_irqs(p); 136 137 seq_printf(p, 138 "\nctxt %llu\n" 139 "btime %llu\n" 140 "processes %lu\n" 141 "procs_running %u\n" 142 "procs_blocked %u\n", 143 nr_context_switches(), 144 (unsigned long long)boottime.tv_sec, 145 total_forks, 146 nr_running(), 147 nr_iowait()); 148 149 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq); 150 151 for (i = 0; i < NR_SOFTIRQS; i++) 152 seq_put_decimal_ull(p, " ", per_softirq_sums[i]); 153 seq_putc(p, '\n'); 154 155 return 0; 156 } 157 158 static int stat_open(struct inode *inode, struct file *file) 159 { 160 unsigned int size = 1024 + 128 * num_online_cpus(); 161 162 /* minimum size to display an interrupt count : 2 bytes */ 163 size += 2 * irq_get_nr_irqs(); 164 return single_open_size(file, show_stat, NULL, size); 165 } 166 167 static const struct proc_ops stat_proc_ops = { 168 .proc_flags = PROC_ENTRY_PERMANENT, 169 .proc_open = stat_open, 170 .proc_read_iter = seq_read_iter, 171 .proc_lseek = seq_lseek, 172 .proc_release = single_release, 173 }; 174 175 static int __init proc_stat_init(void) 176 { 177 proc_create("stat", 0, NULL, &stat_proc_ops); 178 return 0; 179 } 180 fs_initcall(proc_stat_init); 181