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 cputime64_t get_idle_time(int cpu) 26 { 27 u64 idle_time = get_cpu_idle_time_us(cpu, NULL); 28 cputime64_t idle; 29 30 if (idle_time == -1ULL) { 31 /* !NO_HZ so we can rely on cpustat.idle */ 32 idle = kstat_cpu(cpu).cpustat.idle; 33 idle = cputime64_add(idle, arch_idle_time(cpu)); 34 } else 35 idle = usecs_to_cputime(idle_time); 36 37 return idle; 38 } 39 40 static cputime64_t get_iowait_time(int cpu) 41 { 42 u64 iowait_time = get_cpu_iowait_time_us(cpu, NULL); 43 cputime64_t iowait; 44 45 if (iowait_time == -1ULL) 46 /* !NO_HZ so we can rely on cpustat.iowait */ 47 iowait = kstat_cpu(cpu).cpustat.iowait; 48 else 49 iowait = usecs_to_cputime(iowait_time); 50 51 return iowait; 52 } 53 54 static int show_stat(struct seq_file *p, void *v) 55 { 56 int i, j; 57 unsigned long jif; 58 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal; 59 cputime64_t guest, guest_nice; 60 u64 sum = 0; 61 u64 sum_softirq = 0; 62 unsigned int per_softirq_sums[NR_SOFTIRQS] = {0}; 63 struct timespec boottime; 64 65 user = nice = system = idle = iowait = 66 irq = softirq = steal = cputime64_zero; 67 guest = guest_nice = cputime64_zero; 68 getboottime(&boottime); 69 jif = boottime.tv_sec; 70 71 for_each_possible_cpu(i) { 72 user = cputime64_add(user, kstat_cpu(i).cpustat.user); 73 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice); 74 system = cputime64_add(system, kstat_cpu(i).cpustat.system); 75 idle = cputime64_add(idle, get_idle_time(i)); 76 iowait = cputime64_add(iowait, get_iowait_time(i)); 77 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq); 78 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq); 79 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal); 80 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest); 81 guest_nice = cputime64_add(guest_nice, 82 kstat_cpu(i).cpustat.guest_nice); 83 sum += kstat_cpu_irqs_sum(i); 84 sum += arch_irq_stat_cpu(i); 85 86 for (j = 0; j < NR_SOFTIRQS; j++) { 87 unsigned int softirq_stat = kstat_softirqs_cpu(j, i); 88 89 per_softirq_sums[j] += softirq_stat; 90 sum_softirq += softirq_stat; 91 } 92 } 93 sum += arch_irq_stat(); 94 95 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu " 96 "%llu\n", 97 (unsigned long long)cputime64_to_clock_t(user), 98 (unsigned long long)cputime64_to_clock_t(nice), 99 (unsigned long long)cputime64_to_clock_t(system), 100 (unsigned long long)cputime64_to_clock_t(idle), 101 (unsigned long long)cputime64_to_clock_t(iowait), 102 (unsigned long long)cputime64_to_clock_t(irq), 103 (unsigned long long)cputime64_to_clock_t(softirq), 104 (unsigned long long)cputime64_to_clock_t(steal), 105 (unsigned long long)cputime64_to_clock_t(guest), 106 (unsigned long long)cputime64_to_clock_t(guest_nice)); 107 for_each_online_cpu(i) { 108 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */ 109 user = kstat_cpu(i).cpustat.user; 110 nice = kstat_cpu(i).cpustat.nice; 111 system = kstat_cpu(i).cpustat.system; 112 idle = get_idle_time(i); 113 iowait = get_iowait_time(i); 114 irq = kstat_cpu(i).cpustat.irq; 115 softirq = kstat_cpu(i).cpustat.softirq; 116 steal = kstat_cpu(i).cpustat.steal; 117 guest = kstat_cpu(i).cpustat.guest; 118 guest_nice = kstat_cpu(i).cpustat.guest_nice; 119 seq_printf(p, 120 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu " 121 "%llu\n", 122 i, 123 (unsigned long long)cputime64_to_clock_t(user), 124 (unsigned long long)cputime64_to_clock_t(nice), 125 (unsigned long long)cputime64_to_clock_t(system), 126 (unsigned long long)cputime64_to_clock_t(idle), 127 (unsigned long long)cputime64_to_clock_t(iowait), 128 (unsigned long long)cputime64_to_clock_t(irq), 129 (unsigned long long)cputime64_to_clock_t(softirq), 130 (unsigned long long)cputime64_to_clock_t(steal), 131 (unsigned long long)cputime64_to_clock_t(guest), 132 (unsigned long long)cputime64_to_clock_t(guest_nice)); 133 } 134 seq_printf(p, "intr %llu", (unsigned long long)sum); 135 136 /* sum again ? it could be updated? */ 137 for_each_irq_nr(j) 138 seq_printf(p, " %u", kstat_irqs(j)); 139 140 seq_printf(p, 141 "\nctxt %llu\n" 142 "btime %lu\n" 143 "processes %lu\n" 144 "procs_running %lu\n" 145 "procs_blocked %lu\n", 146 nr_context_switches(), 147 (unsigned long)jif, 148 total_forks, 149 nr_running(), 150 nr_iowait()); 151 152 seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq); 153 154 for (i = 0; i < NR_SOFTIRQS; i++) 155 seq_printf(p, " %u", per_softirq_sums[i]); 156 seq_putc(p, '\n'); 157 158 return 0; 159 } 160 161 static int stat_open(struct inode *inode, struct file *file) 162 { 163 unsigned size = 4096 * (1 + num_possible_cpus() / 32); 164 char *buf; 165 struct seq_file *m; 166 int res; 167 168 /* don't ask for more than the kmalloc() max size */ 169 if (size > KMALLOC_MAX_SIZE) 170 size = KMALLOC_MAX_SIZE; 171 buf = kmalloc(size, GFP_KERNEL); 172 if (!buf) 173 return -ENOMEM; 174 175 res = single_open(file, show_stat, NULL); 176 if (!res) { 177 m = file->private_data; 178 m->buf = buf; 179 m->size = size; 180 } else 181 kfree(buf); 182 return res; 183 } 184 185 static const struct file_operations proc_stat_operations = { 186 .open = stat_open, 187 .read = seq_read, 188 .llseek = seq_lseek, 189 .release = single_release, 190 }; 191 192 static int __init proc_stat_init(void) 193 { 194 proc_create("stat", 0, NULL, &proc_stat_operations); 195 return 0; 196 } 197 module_init(proc_stat_init); 198