mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 05:14:38 +00:00
478735e388
In /proc/stat, the number of per-IRQ event is shown by making a sum each irq's events on all cpus. But we can make use of kstat_irqs(). kstat_irqs() do the same calculation, If !CONFIG_GENERIC_HARDIRQ, it's not a big cost. (Both of the number of cpus and irqs are small.) If a system is very big and CONFIG_GENERIC_HARDIRQ, it does for_each_irq() for_each_cpu() - look up a radix tree - read desc->irq_stat[cpu] This seems not efficient. This patch adds kstat_irqs() for CONFIG_GENRIC_HARDIRQ and change the calculation as for_each_irq() look up radix tree for_each_cpu() - read desc->irq_stat[cpu] This reduces cost. A test on (4096cpusp, 256 nodes, 4592 irqs) host (by Jack Steiner) %time cat /proc/stat > /dev/null Before Patch: 2.459 sec After Patch : .561 sec [akpm@linux-foundation.org: unexport kstat_irqs, coding-style tweaks] [akpm@linux-foundation.org: fix unused variable 'per_irq_sum'] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Tested-by: Jack Steiner <steiner@sgi.com> Acked-by: Jack Steiner <steiner@sgi.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
171 lines
4.9 KiB
C
171 lines
4.9 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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#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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#ifndef arch_idle_time
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#define arch_idle_time(cpu) 0
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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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cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
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cputime64_t 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 = cputime64_zero;
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guest = guest_nice = cputime64_zero;
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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 = cputime64_add(user, kstat_cpu(i).cpustat.user);
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nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
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system = cputime64_add(system, kstat_cpu(i).cpustat.system);
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idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
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idle = cputime64_add(idle, arch_idle_time(i));
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iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
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irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
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softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
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steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
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guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
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guest_nice = cputime64_add(guest_nice,
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kstat_cpu(i).cpustat.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_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu "
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"%llu\n",
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(unsigned long long)cputime64_to_clock_t(user),
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(unsigned long long)cputime64_to_clock_t(nice),
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(unsigned long long)cputime64_to_clock_t(system),
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(unsigned long long)cputime64_to_clock_t(idle),
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(unsigned long long)cputime64_to_clock_t(iowait),
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(unsigned long long)cputime64_to_clock_t(irq),
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(unsigned long long)cputime64_to_clock_t(softirq),
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(unsigned long long)cputime64_to_clock_t(steal),
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(unsigned long long)cputime64_to_clock_t(guest),
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(unsigned long long)cputime64_to_clock_t(guest_nice));
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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 = kstat_cpu(i).cpustat.user;
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nice = kstat_cpu(i).cpustat.nice;
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system = kstat_cpu(i).cpustat.system;
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idle = kstat_cpu(i).cpustat.idle;
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idle = cputime64_add(idle, arch_idle_time(i));
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iowait = kstat_cpu(i).cpustat.iowait;
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irq = kstat_cpu(i).cpustat.irq;
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softirq = kstat_cpu(i).cpustat.softirq;
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steal = kstat_cpu(i).cpustat.steal;
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guest = kstat_cpu(i).cpustat.guest;
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guest_nice = kstat_cpu(i).cpustat.guest_nice;
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seq_printf(p,
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"cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
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"%llu\n",
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i,
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(unsigned long long)cputime64_to_clock_t(user),
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(unsigned long long)cputime64_to_clock_t(nice),
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(unsigned long long)cputime64_to_clock_t(system),
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(unsigned long long)cputime64_to_clock_t(idle),
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(unsigned long long)cputime64_to_clock_t(iowait),
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(unsigned long long)cputime64_to_clock_t(irq),
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(unsigned long long)cputime64_to_clock_t(softirq),
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(unsigned long long)cputime64_to_clock_t(steal),
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(unsigned long long)cputime64_to_clock_t(guest),
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(unsigned long long)cputime64_to_clock_t(guest_nice));
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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_printf(p, " %u", 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_printf(p, " %u", per_softirq_sums[i]);
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seq_printf(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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unsigned size = 4096 * (1 + num_possible_cpus() / 32);
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char *buf;
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struct seq_file *m;
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int res;
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/* don't ask for more than the kmalloc() max size, currently 128 KB */
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if (size > 128 * 1024)
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size = 128 * 1024;
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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 = size;
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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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