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Linux/fs/proc/softirqs.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/init.h>
  3 #include <linux/kernel_stat.h>
  4 #include <linux/proc_fs.h>
  5 #include <linux/seq_file.h>
  6 
  7 /*
  8  * /proc/softirqs  ... display the number of softirqs
  9  */
 10 static int show_softirqs(struct seq_file *p, void *v)
 11 {
 12         int i, j;
 13 
 14         seq_puts(p, "                    ");
 15         for_each_possible_cpu(i)
 16                 seq_printf(p, "CPU%-8d", i);
 17         seq_putc(p, '\n');
 18 
 19         for (i = 0; i < NR_SOFTIRQS; i++) {
 20                 seq_printf(p, "%12s:", softirq_to_name[i]);
 21                 for_each_possible_cpu(j)
 22                         seq_printf(p, " %10u", kstat_softirqs_cpu(i, j));
 23                 seq_putc(p, '\n');
 24         }
 25         return 0;
 26 }
 27 
 28 static int softirqs_open(struct inode *inode, struct file *file)
 29 {
 30         return single_open(file, show_softirqs, NULL);
 31 }
 32 
 33 static const struct file_operations proc_softirqs_operations = {
 34         .open           = softirqs_open,
 35         .read           = seq_read,
 36         .llseek         = seq_lseek,
 37         .release        = single_release,
 38 };
 39 
 40 static int __init proc_softirqs_init(void)
 41 {
 42         proc_create("softirqs", 0, NULL, &proc_softirqs_operations);
 43         return 0;
 44 }
 45 fs_initcall(proc_softirqs_init);
 46 

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