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![Christoph Lameter](/assets/img/avatar_default.png)
On some platforms (such as IA64) the large page size may results in slab allocations to be allowed of numbers that do not fit in 32 bit. Acked-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
224 lines
5.9 KiB
C
224 lines
5.9 KiB
C
#include <linux/cpumask.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/proc_fs.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/irqnr.h>
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#include <asm/cputime.h>
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#include <linux/tick.h>
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#ifndef arch_irq_stat_cpu
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#define arch_irq_stat_cpu(cpu) 0
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#endif
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#ifndef arch_irq_stat
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#define arch_irq_stat() 0
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#endif
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#ifdef arch_idle_time
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static cputime64_t get_idle_time(int cpu)
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{
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cputime64_t idle;
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idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
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if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
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idle += arch_idle_time(cpu);
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return idle;
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}
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static cputime64_t get_iowait_time(int cpu)
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{
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cputime64_t iowait;
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iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
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if (cpu_online(cpu) && nr_iowait_cpu(cpu))
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iowait += arch_idle_time(cpu);
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return iowait;
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}
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#else
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static u64 get_idle_time(int cpu)
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{
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u64 idle, idle_time = -1ULL;
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if (cpu_online(cpu))
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idle_time = get_cpu_idle_time_us(cpu, NULL);
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if (idle_time == -1ULL)
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/* !NO_HZ or cpu offline so we can rely on cpustat.idle */
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idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
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else
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idle = usecs_to_cputime64(idle_time);
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return idle;
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}
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static u64 get_iowait_time(int cpu)
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{
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u64 iowait, iowait_time = -1ULL;
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if (cpu_online(cpu))
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iowait_time = get_cpu_iowait_time_us(cpu, NULL);
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if (iowait_time == -1ULL)
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/* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
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iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
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else
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iowait = usecs_to_cputime64(iowait_time);
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return iowait;
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}
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#endif
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static int show_stat(struct seq_file *p, void *v)
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{
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int i, j;
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unsigned long jif;
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u64 user, nice, system, idle, iowait, irq, softirq, steal;
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u64 guest, guest_nice;
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u64 sum = 0;
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u64 sum_softirq = 0;
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unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
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struct timespec boottime;
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user = nice = system = idle = iowait =
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irq = softirq = steal = 0;
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guest = guest_nice = 0;
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getboottime(&boottime);
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jif = boottime.tv_sec;
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for_each_possible_cpu(i) {
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user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
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nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
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system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
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idle += get_idle_time(i);
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iowait += get_iowait_time(i);
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irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
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softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
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steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
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guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
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guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
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sum += kstat_cpu_irqs_sum(i);
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sum += arch_irq_stat_cpu(i);
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for (j = 0; j < NR_SOFTIRQS; j++) {
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unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
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per_softirq_sums[j] += softirq_stat;
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sum_softirq += softirq_stat;
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}
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}
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sum += arch_irq_stat();
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seq_puts(p, "cpu ");
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
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seq_putc(p, '\n');
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for_each_online_cpu(i) {
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/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
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user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
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nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
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system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
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idle = get_idle_time(i);
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iowait = get_iowait_time(i);
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irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
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softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
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steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
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guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
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guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
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seq_printf(p, "cpu%d", i);
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(user));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(nice));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(system));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(idle));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(iowait));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(irq));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(softirq));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
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seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
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seq_putc(p, '\n');
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}
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seq_printf(p, "intr %llu", (unsigned long long)sum);
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/* sum again ? it could be updated? */
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for_each_irq_nr(j)
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seq_put_decimal_ull(p, ' ', kstat_irqs(j));
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seq_printf(p,
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"\nctxt %llu\n"
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"btime %lu\n"
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"processes %lu\n"
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"procs_running %lu\n"
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"procs_blocked %lu\n",
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nr_context_switches(),
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(unsigned long)jif,
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total_forks,
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nr_running(),
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nr_iowait());
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seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
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for (i = 0; i < NR_SOFTIRQS; i++)
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seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
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seq_putc(p, '\n');
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return 0;
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}
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static int stat_open(struct inode *inode, struct file *file)
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{
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size_t size = 1024 + 128 * num_possible_cpus();
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char *buf;
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struct seq_file *m;
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int res;
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/* minimum size to display an interrupt count : 2 bytes */
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size += 2 * nr_irqs;
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/* don't ask for more than the kmalloc() max size */
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if (size > KMALLOC_MAX_SIZE)
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size = KMALLOC_MAX_SIZE;
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buf = kmalloc(size, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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res = single_open(file, show_stat, NULL);
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if (!res) {
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m = file->private_data;
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m->buf = buf;
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m->size = ksize(buf);
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} else
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kfree(buf);
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return res;
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}
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static const struct file_operations proc_stat_operations = {
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.open = stat_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init proc_stat_init(void)
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{
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proc_create("stat", 0, NULL, &proc_stat_operations);
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return 0;
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}
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module_init(proc_stat_init);
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