1 #include <linux/cpumask.h> 2 #include <linux/fs.h> 3 #include <linux/init.h> 4 #include <linux/interrupt.h> 5 #include <linux/kernel_stat.h> 6 #include <linux/proc_fs.h> 7 #include <linux/sched.h> 8 #include <linux/seq_file.h> 9 #include <linux/slab.h> 10 #include <linux/time.h> 11 #include <linux/irqnr.h> 12 #include <linux/cputime.h> 13 #include <linux/tick.h> 14 15 #ifndef arch_irq_stat_cpu 16 #define arch_irq_stat_cpu(cpu) 0 17 #endif 18 #ifndef arch_irq_stat 19 #define arch_irq_stat() 0 20 #endif 21 22 #ifdef arch_idle_time 23 24 static cputime64_t get_idle_time(int cpu) 25 { 26 cputime64_t idle; 27 28 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; 29 if (cpu_online(cpu) && !nr_iowait_cpu(cpu)) 30 idle += arch_idle_time(cpu); 31 return idle; 32 } 33 34 static cputime64_t get_iowait_time(int cpu) 35 { 36 cputime64_t iowait; 37 38 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; 39 if (cpu_online(cpu) && nr_iowait_cpu(cpu)) 40 iowait += arch_idle_time(cpu); 41 return iowait; 42 } 43 44 #else 45 46 static u64 get_idle_time(int cpu) 47 { 48 u64 idle, idle_time = -1ULL; 49 50 if (cpu_online(cpu)) 51 idle_time = get_cpu_idle_time_us(cpu, NULL); 52 53 if (idle_time == -1ULL) 54 /* !NO_HZ or cpu offline so we can rely on cpustat.idle */ 55 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; 56 else 57 idle = usecs_to_cputime64(idle_time); 58 59 return idle; 60 } 61 62 static u64 get_iowait_time(int cpu) 63 { 64 u64 iowait, iowait_time = -1ULL; 65 66 if (cpu_online(cpu)) 67 iowait_time = get_cpu_iowait_time_us(cpu, NULL); 68 69 if (iowait_time == -1ULL) 70 /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */ 71 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; 72 else 73 iowait = usecs_to_cputime64(iowait_time); 74 75 return iowait; 76 } 77 78 #endif 79 80 static int show_stat(struct seq_file *p, void *v) 81 { 82 int i, j; 83 u64 user, nice, system, idle, iowait, irq, softirq, steal; 84 u64 guest, guest_nice; 85 u64 sum = 0; 86 u64 sum_softirq = 0; 87 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; 88 struct timespec64 boottime; 89 90 user = nice = system = idle = iowait = 91 irq = softirq = steal = 0; 92 guest = guest_nice = 0; 93 getboottime64(&boottime); 94 95 for_each_possible_cpu(i) { 96 user += kcpustat_cpu(i).cpustat[CPUTIME_USER]; 97 nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 98 system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 99 idle += get_idle_time(i); 100 iowait += get_iowait_time(i); 101 irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 102 softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 103 steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 104 guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 105 guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE]; 106 sum += kstat_cpu_irqs_sum(i); 107 sum += arch_irq_stat_cpu(i); 108 109 for (j = 0; j < NR_SOFTIRQS; j++) { 110 unsigned int softirq_stat = kstat_softirqs_cpu(j, i); 111 112 per_softirq_sums[j] += softirq_stat; 113 sum_softirq += softirq_stat; 114 } 115 } 116 sum += arch_irq_stat(); 117 118 seq_put_decimal_ull(p, "cpu ", cputime64_to_clock_t(user)); 119 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(nice)); 120 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(system)); 121 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(idle)); 122 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(iowait)); 123 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(irq)); 124 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(softirq)); 125 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(steal)); 126 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest)); 127 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest_nice)); 128 seq_putc(p, '\n'); 129 130 for_each_online_cpu(i) { 131 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 132 user = kcpustat_cpu(i).cpustat[CPUTIME_USER]; 133 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 134 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 135 idle = get_idle_time(i); 136 iowait = get_iowait_time(i); 137 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 138 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 139 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 140 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 141 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE]; 142 seq_printf(p, "cpu%d", i); 143 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(user)); 144 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(nice)); 145 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(system)); 146 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(idle)); 147 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(iowait)); 148 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(irq)); 149 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(softirq)); 150 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(steal)); 151 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest)); 152 seq_put_decimal_ull(p, " ", cputime64_to_clock_t(guest_nice)); 153 seq_putc(p, '\n'); 154 } 155 seq_put_decimal_ull(p, "intr ", (unsigned long long)sum); 156 157 /* sum again ? it could be updated? */ 158 for_each_irq_nr(j) 159 seq_put_decimal_ull(p, " ", kstat_irqs_usr(j)); 160 161 seq_printf(p, 162 "\nctxt %llu\n" 163 "btime %llu\n" 164 "processes %lu\n" 165 "procs_running %lu\n" 166 "procs_blocked %lu\n", 167 nr_context_switches(), 168 (unsigned long long)boottime.tv_sec, 169 total_forks, 170 nr_running(), 171 nr_iowait()); 172 173 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq); 174 175 for (i = 0; i < NR_SOFTIRQS; i++) 176 seq_put_decimal_ull(p, " ", per_softirq_sums[i]); 177 seq_putc(p, '\n'); 178 179 return 0; 180 } 181 182 static int stat_open(struct inode *inode, struct file *file) 183 { 184 size_t size = 1024 + 128 * num_online_cpus(); 185 186 /* minimum size to display an interrupt count : 2 bytes */ 187 size += 2 * nr_irqs; 188 return single_open_size(file, show_stat, NULL, size); 189 } 190 191 static const struct file_operations proc_stat_operations = { 192 .open = stat_open, 193 .read = seq_read, 194 .llseek = seq_lseek, 195 .release = single_release, 196 }; 197 198 static int __init proc_stat_init(void) 199 { 200 proc_create("stat", 0, NULL, &proc_stat_operations); 201 return 0; 202 } 203 fs_initcall(proc_stat_init); 204