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 = get_cpu_idle_time_us(cpu, NULL); 49 50 if (idle_time == -1ULL) 51 /* !NO_HZ so we can rely on cpustat.idle */ 52 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; 53 else 54 idle = usecs_to_cputime64(idle_time); 55 56 return idle; 57 } 58 59 static u64 get_iowait_time(int cpu) 60 { 61 u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL); 62 63 if (iowait_time == -1ULL) 64 /* !NO_HZ so we can rely on cpustat.iowait */ 65 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; 66 else 67 iowait = usecs_to_cputime64(iowait_time); 68 69 return iowait; 70 } 71 72 #endif 73 74 static int show_stat(struct seq_file *p, void *v) 75 { 76 int i, j; 77 unsigned long jif; 78 u64 user, nice, system, idle, iowait, irq, softirq, steal; 79 u64 guest, guest_nice; 80 u64 sum = 0; 81 u64 sum_softirq = 0; 82 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; 83 struct timespec boottime; 84 85 user = nice = system = idle = iowait = 86 irq = softirq = steal = 0; 87 guest = guest_nice = 0; 88 getboottime(&boottime); 89 jif = boottime.tv_sec; 90 91 for_each_possible_cpu(i) { 92 user += kcpustat_cpu(i).cpustat[CPUTIME_USER]; 93 nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 94 system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 95 idle += get_idle_time(i); 96 iowait += get_iowait_time(i); 97 irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 98 softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 99 steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 100 guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 101 guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE]; 102 sum += kstat_cpu_irqs_sum(i); 103 sum += arch_irq_stat_cpu(i); 104 105 for (j = 0; j < NR_SOFTIRQS; j++) { 106 unsigned int softirq_stat = kstat_softirqs_cpu(j, i); 107 108 per_softirq_sums[j] += softirq_stat; 109 sum_softirq += softirq_stat; 110 } 111 } 112 sum += arch_irq_stat(); 113 114 seq_puts(p, "cpu "); 115 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user)); 116 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice)); 117 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system)); 118 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle)); 119 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait)); 120 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq)); 121 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq)); 122 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal)); 123 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest)); 124 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice)); 125 seq_putc(p, '\n'); 126 127 for_each_online_cpu(i) { 128 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 129 user = kcpustat_cpu(i).cpustat[CPUTIME_USER]; 130 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 131 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 132 idle = get_idle_time(i); 133 iowait = get_iowait_time(i); 134 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 135 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 136 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 137 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 138 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE]; 139 seq_printf(p, "cpu%d", i); 140 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user)); 141 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice)); 142 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system)); 143 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle)); 144 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait)); 145 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq)); 146 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq)); 147 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal)); 148 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest)); 149 seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice)); 150 seq_putc(p, '\n'); 151 } 152 seq_printf(p, "intr %llu", (unsigned long long)sum); 153 154 /* sum again ? it could be updated? */ 155 for_each_irq_nr(j) 156 seq_put_decimal_ull(p, ' ', kstat_irqs(j)); 157 158 seq_printf(p, 159 "\nctxt %llu\n" 160 "btime %lu\n" 161 "processes %lu\n" 162 "procs_running %lu\n" 163 "procs_blocked %lu\n", 164 nr_context_switches(), 165 (unsigned long)jif, 166 total_forks, 167 nr_running(), 168 nr_iowait()); 169 170 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq); 171 172 for (i = 0; i < NR_SOFTIRQS; i++) 173 seq_put_decimal_ull(p, ' ', per_softirq_sums[i]); 174 seq_putc(p, '\n'); 175 176 return 0; 177 } 178 179 static int stat_open(struct inode *inode, struct file *file) 180 { 181 unsigned size = 1024 + 128 * num_possible_cpus(); 182 char *buf; 183 struct seq_file *m; 184 int res; 185 186 /* minimum size to display an interrupt count : 2 bytes */ 187 size += 2 * nr_irqs; 188 189 /* don't ask for more than the kmalloc() max size */ 190 if (size > KMALLOC_MAX_SIZE) 191 size = KMALLOC_MAX_SIZE; 192 buf = kmalloc(size, GFP_KERNEL); 193 if (!buf) 194 return -ENOMEM; 195 196 res = single_open(file, show_stat, NULL); 197 if (!res) { 198 m = file->private_data; 199 m->buf = buf; 200 m->size = ksize(buf); 201 } else 202 kfree(buf); 203 return res; 204 } 205 206 static const struct file_operations proc_stat_operations = { 207 .open = stat_open, 208 .read = seq_read, 209 .llseek = seq_lseek, 210 .release = single_release, 211 }; 212 213 static int __init proc_stat_init(void) 214 { 215 proc_create("stat", 0, NULL, &proc_stat_operations); 216 return 0; 217 } 218 module_init(proc_stat_init); 219