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0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/cpumask.h>
0003 #include <linux/fs.h>
0004 #include <linux/init.h>
0005 #include <linux/interrupt.h>
0006 #include <linux/kernel_stat.h>
0007 #include <linux/proc_fs.h>
0008 #include <linux/sched.h>
0009 #include <linux/sched/stat.h>
0010 #include <linux/seq_file.h>
0011 #include <linux/slab.h>
0012 #include <linux/time.h>
0013 #include <linux/time_namespace.h>
0014 #include <linux/irqnr.h>
0015 #include <linux/sched/cputime.h>
0016 #include <linux/tick.h>
0017 
0018 #ifndef arch_irq_stat_cpu
0019 #define arch_irq_stat_cpu(cpu) 0
0020 #endif
0021 #ifndef arch_irq_stat
0022 #define arch_irq_stat() 0
0023 #endif
0024 
0025 #ifdef arch_idle_time
0026 
0027 u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
0028 {
0029     u64 idle;
0030 
0031     idle = kcs->cpustat[CPUTIME_IDLE];
0032     if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
0033         idle += arch_idle_time(cpu);
0034     return idle;
0035 }
0036 
0037 static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
0038 {
0039     u64 iowait;
0040 
0041     iowait = kcs->cpustat[CPUTIME_IOWAIT];
0042     if (cpu_online(cpu) && nr_iowait_cpu(cpu))
0043         iowait += arch_idle_time(cpu);
0044     return iowait;
0045 }
0046 
0047 #else
0048 
0049 u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
0050 {
0051     u64 idle, idle_usecs = -1ULL;
0052 
0053     if (cpu_online(cpu))
0054         idle_usecs = get_cpu_idle_time_us(cpu, NULL);
0055 
0056     if (idle_usecs == -1ULL)
0057         /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
0058         idle = kcs->cpustat[CPUTIME_IDLE];
0059     else
0060         idle = idle_usecs * NSEC_PER_USEC;
0061 
0062     return idle;
0063 }
0064 
0065 static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
0066 {
0067     u64 iowait, iowait_usecs = -1ULL;
0068 
0069     if (cpu_online(cpu))
0070         iowait_usecs = get_cpu_iowait_time_us(cpu, NULL);
0071 
0072     if (iowait_usecs == -1ULL)
0073         /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
0074         iowait = kcs->cpustat[CPUTIME_IOWAIT];
0075     else
0076         iowait = iowait_usecs * NSEC_PER_USEC;
0077 
0078     return iowait;
0079 }
0080 
0081 #endif
0082 
0083 static void show_irq_gap(struct seq_file *p, unsigned int gap)
0084 {
0085     static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";
0086 
0087     while (gap > 0) {
0088         unsigned int inc;
0089 
0090         inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2);
0091         seq_write(p, zeros, 2 * inc);
0092         gap -= inc;
0093     }
0094 }
0095 
0096 static void show_all_irqs(struct seq_file *p)
0097 {
0098     unsigned int i, next = 0;
0099 
0100     for_each_active_irq(i) {
0101         show_irq_gap(p, i - next);
0102         seq_put_decimal_ull(p, " ", kstat_irqs_usr(i));
0103         next = i + 1;
0104     }
0105     show_irq_gap(p, nr_irqs - next);
0106 }
0107 
0108 static int show_stat(struct seq_file *p, void *v)
0109 {
0110     int i, j;
0111     u64 user, nice, system, idle, iowait, irq, softirq, steal;
0112     u64 guest, guest_nice;
0113     u64 sum = 0;
0114     u64 sum_softirq = 0;
0115     unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
0116     struct timespec64 boottime;
0117 
0118     user = nice = system = idle = iowait =
0119         irq = softirq = steal = 0;
0120     guest = guest_nice = 0;
0121     getboottime64(&boottime);
0122     /* shift boot timestamp according to the timens offset */
0123     timens_sub_boottime(&boottime);
0124 
0125     for_each_possible_cpu(i) {
0126         struct kernel_cpustat kcpustat;
0127         u64 *cpustat = kcpustat.cpustat;
0128 
0129         kcpustat_cpu_fetch(&kcpustat, i);
0130 
0131         user        += cpustat[CPUTIME_USER];
0132         nice        += cpustat[CPUTIME_NICE];
0133         system      += cpustat[CPUTIME_SYSTEM];
0134         idle        += get_idle_time(&kcpustat, i);
0135         iowait      += get_iowait_time(&kcpustat, i);
0136         irq     += cpustat[CPUTIME_IRQ];
0137         softirq     += cpustat[CPUTIME_SOFTIRQ];
0138         steal       += cpustat[CPUTIME_STEAL];
0139         guest       += cpustat[CPUTIME_GUEST];
0140         guest_nice  += cpustat[CPUTIME_GUEST_NICE];
0141         sum     += kstat_cpu_irqs_sum(i);
0142         sum     += arch_irq_stat_cpu(i);
0143 
0144         for (j = 0; j < NR_SOFTIRQS; j++) {
0145             unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
0146 
0147             per_softirq_sums[j] += softirq_stat;
0148             sum_softirq += softirq_stat;
0149         }
0150     }
0151     sum += arch_irq_stat();
0152 
0153     seq_put_decimal_ull(p, "cpu  ", nsec_to_clock_t(user));
0154     seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
0155     seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
0156     seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
0157     seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
0158     seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
0159     seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
0160     seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
0161     seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
0162     seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
0163     seq_putc(p, '\n');
0164 
0165     for_each_online_cpu(i) {
0166         struct kernel_cpustat kcpustat;
0167         u64 *cpustat = kcpustat.cpustat;
0168 
0169         kcpustat_cpu_fetch(&kcpustat, i);
0170 
0171         /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
0172         user        = cpustat[CPUTIME_USER];
0173         nice        = cpustat[CPUTIME_NICE];
0174         system      = cpustat[CPUTIME_SYSTEM];
0175         idle        = get_idle_time(&kcpustat, i);
0176         iowait      = get_iowait_time(&kcpustat, i);
0177         irq     = cpustat[CPUTIME_IRQ];
0178         softirq     = cpustat[CPUTIME_SOFTIRQ];
0179         steal       = cpustat[CPUTIME_STEAL];
0180         guest       = cpustat[CPUTIME_GUEST];
0181         guest_nice  = cpustat[CPUTIME_GUEST_NICE];
0182         seq_printf(p, "cpu%d", i);
0183         seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
0184         seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
0185         seq_put_decimal_ull(p, " ", nsec_to_clock_t(system));
0186         seq_put_decimal_ull(p, " ", nsec_to_clock_t(idle));
0187         seq_put_decimal_ull(p, " ", nsec_to_clock_t(iowait));
0188         seq_put_decimal_ull(p, " ", nsec_to_clock_t(irq));
0189         seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq));
0190         seq_put_decimal_ull(p, " ", nsec_to_clock_t(steal));
0191         seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest));
0192         seq_put_decimal_ull(p, " ", nsec_to_clock_t(guest_nice));
0193         seq_putc(p, '\n');
0194     }
0195     seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
0196 
0197     show_all_irqs(p);
0198 
0199     seq_printf(p,
0200         "\nctxt %llu\n"
0201         "btime %llu\n"
0202         "processes %lu\n"
0203         "procs_running %u\n"
0204         "procs_blocked %u\n",
0205         nr_context_switches(),
0206         (unsigned long long)boottime.tv_sec,
0207         total_forks,
0208         nr_running(),
0209         nr_iowait());
0210 
0211     seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
0212 
0213     for (i = 0; i < NR_SOFTIRQS; i++)
0214         seq_put_decimal_ull(p, " ", per_softirq_sums[i]);
0215     seq_putc(p, '\n');
0216 
0217     return 0;
0218 }
0219 
0220 static int stat_open(struct inode *inode, struct file *file)
0221 {
0222     unsigned int size = 1024 + 128 * num_online_cpus();
0223 
0224     /* minimum size to display an interrupt count : 2 bytes */
0225     size += 2 * nr_irqs;
0226     return single_open_size(file, show_stat, NULL, size);
0227 }
0228 
0229 static const struct proc_ops stat_proc_ops = {
0230     .proc_flags = PROC_ENTRY_PERMANENT,
0231     .proc_open  = stat_open,
0232     .proc_read_iter = seq_read_iter,
0233     .proc_lseek = seq_lseek,
0234     .proc_release   = single_release,
0235 };
0236 
0237 static int __init proc_stat_init(void)
0238 {
0239     proc_create("stat", 0, NULL, &stat_proc_ops);
0240     return 0;
0241 }
0242 fs_initcall(proc_stat_init);
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