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 #ifndef arch_idle_time 22 #define arch_idle_time(cpu) 0 23 #endif 24 25 static u64 get_idle_time(int cpu) 26 { 27 u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL); 28 29 if (idle_time == -1ULL) { 30 /* !NO_HZ so we can rely on cpustat.idle */ 31 idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; 32 idle += arch_idle_time(cpu); 33 } else 34 idle = usecs_to_cputime64(idle_time); 35 36 return idle; 37 } 38 39 static u64 get_iowait_time(int cpu) 40 { 41 u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL); 42 43 if (iowait_time == -1ULL) 44 /* !NO_HZ so we can rely on cpustat.iowait */ 45 iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; 46 else 47 iowait = usecs_to_cputime64(iowait_time); 48 49 return iowait; 50 } 51 52 static int show_stat(struct seq_file *p, void *v) 53 { 54 int i, j; 55 unsigned long jif; 56 u64 user, nice, system, idle, iowait, irq, softirq, steal; 57 u64 guest, guest_nice; 58 u64 sum = 0; 59 u64 sum_softirq = 0; 60 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; 61 struct timespec boottime; 62 63 user = nice = system = idle = iowait = 64 irq = softirq = steal = 0; 65 guest = guest_nice = 0; 66 getboottime(&boottime); 67 jif = boottime.tv_sec; 68 69 for_each_possible_cpu(i) { 70 user += kcpustat_cpu(i).cpustat[CPUTIME_USER]; 71 nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 72 system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 73 idle += get_idle_time(i); 74 iowait += get_iowait_time(i); 75 irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 76 softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 77 steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 78 guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 79 guest_nice += kcpustat_cpu(i).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 sum += arch_irq_stat(); 91 92 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu " 93 "%llu\n", 94 (unsigned long long)cputime64_to_clock_t(user), 95 (unsigned long long)cputime64_to_clock_t(nice), 96 (unsigned long long)cputime64_to_clock_t(system), 97 (unsigned long long)cputime64_to_clock_t(idle), 98 (unsigned long long)cputime64_to_clock_t(iowait), 99 (unsigned long long)cputime64_to_clock_t(irq), 100 (unsigned long long)cputime64_to_clock_t(softirq), 101 (unsigned long long)cputime64_to_clock_t(steal), 102 (unsigned long long)cputime64_to_clock_t(guest), 103 (unsigned long long)cputime64_to_clock_t(guest_nice)); 104 for_each_online_cpu(i) { 105 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 106 user = kcpustat_cpu(i).cpustat[CPUTIME_USER]; 107 nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE]; 108 system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]; 109 idle = get_idle_time(i); 110 iowait = get_iowait_time(i); 111 irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ]; 112 softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]; 113 steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL]; 114 guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST]; 115 guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE]; 116 seq_printf(p, 117 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu " 118 "%llu\n", 119 i, 120 (unsigned long long)cputime64_to_clock_t(user), 121 (unsigned long long)cputime64_to_clock_t(nice), 122 (unsigned long long)cputime64_to_clock_t(system), 123 (unsigned long long)cputime64_to_clock_t(idle), 124 (unsigned long long)cputime64_to_clock_t(iowait), 125 (unsigned long long)cputime64_to_clock_t(irq), 126 (unsigned long long)cputime64_to_clock_t(softirq), 127 (unsigned long long)cputime64_to_clock_t(steal), 128 (unsigned long long)cputime64_to_clock_t(guest), 129 (unsigned long long)cputime64_to_clock_t(guest_nice)); 130 } 131 seq_printf(p, "intr %llu", (unsigned long long)sum); 132 133 /* sum again ? it could be updated? */ 134 for_each_irq_nr(j) 135 seq_printf(p, " %u", kstat_irqs(j)); 136 137 seq_printf(p, 138 "\nctxt %llu\n" 139 "btime %lu\n" 140 "processes %lu\n" 141 "procs_running %lu\n" 142 "procs_blocked %lu\n", 143 nr_context_switches(), 144 (unsigned long)jif, 145 total_forks, 146 nr_running(), 147 nr_iowait()); 148 149 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq); 150 151 for (i = 0; i < NR_SOFTIRQS; i++) 152 seq_printf(p, " %u", 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 size = 4096 * (1 + num_possible_cpus() / 32); 161 char *buf; 162 struct seq_file *m; 163 int res; 164 165 /* don't ask for more than the kmalloc() max size */ 166 if (size > KMALLOC_MAX_SIZE) 167 size = KMALLOC_MAX_SIZE; 168 buf = kmalloc(size, GFP_KERNEL); 169 if (!buf) 170 return -ENOMEM; 171 172 res = single_open(file, show_stat, NULL); 173 if (!res) { 174 m = file->private_data; 175 m->buf = buf; 176 m->size = size; 177 } else 178 kfree(buf); 179 return res; 180 } 181 182 static const struct file_operations proc_stat_operations = { 183 .open = stat_open, 184 .read = seq_read, 185 .llseek = seq_lseek, 186 .release = single_release, 187 }; 188 189 static int __init proc_stat_init(void) 190 { 191 proc_create("stat", 0, NULL, &proc_stat_operations); 192 return 0; 193 } 194 module_init(proc_stat_init); 195