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 <asm/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 unsigned long jif; 84 u64 user, nice, system, idle, iowait, irq, softirq, steal; 85 u64 guest, guest_nice; 86 u64 sum = 0; 87 u64 sum_softirq = 0; 88 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; 89 struct timespec boottime; 90 91 user = nice = system = idle = iowait = 92 irq = softirq = steal = 0; 93 guest = guest_nice = 0; 94 getboottime(&boottime); 95 jif = boottime.tv_sec; 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_puts(p, "cpu "); 121 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user)); 122 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice)); 123 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system)); 124 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle)); 125 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait)); 126 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq)); 127 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq)); 128 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal)); 129 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest)); 130 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice)); 131 seq_putc(p, '\n'); 132 133 for_each_online_cpu(i) { 134 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 135 user = kcpustat_cpu(i).cpustat[CPUTIME_USER]; 136 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 137 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 138 idle = get_idle_time(i); 139 iowait = get_iowait_time(i); 140 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 141 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 142 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 143 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 144 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE]; 145 seq_printf(p, "cpu%d", i); 146 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user)); 147 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice)); 148 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system)); 149 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle)); 150 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait)); 151 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq)); 152 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq)); 153 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal)); 154 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest)); 155 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice)); 156 seq_putc(p, '\n'); 157 } 158 seq_printf(p, "intr %llu", (unsigned long long)sum); 159 160 /* sum again ? it could be updated? */ 161 for_each_irq_nr(j) 162 seq_put_decimal_ull(p, ' ', kstat_irqs(j)); 163 164 seq_printf(p, 165 "\nctxt %llu\n" 166 "btime %lu\n" 167 "processes %lu\n" 168 "procs_running %lu\n" 169 "procs_blocked %lu\n", 170 nr_context_switches(), 171 (unsigned long)jif, 172 total_forks, 173 nr_running(), 174 nr_iowait()); 175 176 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq); 177 178 for (i = 0; i < NR_SOFTIRQS; i++) 179 seq_put_decimal_ull(p, ' ', per_softirq_sums[i]); 180 seq_putc(p, '\n'); 181 182 return 0; 183 } 184 185 static int stat_open(struct inode *inode, struct file *file) 186 { 187 size_t size = 1024 + 128 * num_possible_cpus(); 188 char *buf; 189 struct seq_file *m; 190 int res; 191 192 /* minimum size to display an interrupt count : 2 bytes */ 193 size += 2 * nr_irqs; 194 195 /* don't ask for more than the kmalloc() max size */ 196 if (size > KMALLOC_MAX_SIZE) 197 size = KMALLOC_MAX_SIZE; 198 buf = kmalloc(size, GFP_KERNEL); 199 if (!buf) 200 return -ENOMEM; 201 202 res = single_open(file, show_stat, NULL); 203 if (!res) { 204 m = file->private_data; 205 m->buf = buf; 206 m->size = ksize(buf); 207 } else 208 kfree(buf); 209 return res; 210 } 211 212 static const struct file_operations proc_stat_operations = { 213 .open = stat_open, 214 .read = seq_read, 215 .llseek = seq_lseek, 216 .release = single_release, 217 }; 218 219 static int __init proc_stat_init(void) 220 { 221 proc_create("stat", 0, NULL, &proc_stat_operations); 222 return 0; 223 } 224 module_init(proc_stat_init); 225