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TOMOYO Linux Cross Reference
Linux/kernel/time/timekeeping_debug.c

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  1 /*
  2  * debugfs file to track time spent in suspend
  3  *
  4  * Copyright (c) 2011, Google, Inc.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful, but WITHOUT
 12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 14  * more details.
 15  */
 16 
 17 #include <linux/debugfs.h>
 18 #include <linux/err.h>
 19 #include <linux/init.h>
 20 #include <linux/kernel.h>
 21 #include <linux/seq_file.h>
 22 #include <linux/suspend.h>
 23 #include <linux/time.h>
 24 
 25 #include "timekeeping_internal.h"
 26 
 27 #define NUM_BINS 32
 28 
 29 static unsigned int sleep_time_bin[NUM_BINS] = {0};
 30 
 31 static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
 32 {
 33         unsigned int bin;
 34         seq_puts(s, "      time (secs)        count\n");
 35         seq_puts(s, "------------------------------\n");
 36         for (bin = 0; bin < 32; bin++) {
 37                 if (sleep_time_bin[bin] == 0)
 38                         continue;
 39                 seq_printf(s, "%10u - %-10u %4u\n",
 40                         bin ? 1 << (bin - 1) : 0, 1 << bin,
 41                                 sleep_time_bin[bin]);
 42         }
 43         return 0;
 44 }
 45 
 46 static int tk_debug_sleep_time_open(struct inode *inode, struct file *file)
 47 {
 48         return single_open(file, tk_debug_show_sleep_time, NULL);
 49 }
 50 
 51 static const struct file_operations tk_debug_sleep_time_fops = {
 52         .open           = tk_debug_sleep_time_open,
 53         .read           = seq_read,
 54         .llseek         = seq_lseek,
 55         .release        = single_release,
 56 };
 57 
 58 static int __init tk_debug_sleep_time_init(void)
 59 {
 60         struct dentry *d;
 61 
 62         d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
 63                 &tk_debug_sleep_time_fops);
 64         if (!d) {
 65                 pr_err("Failed to create sleep_time debug file\n");
 66                 return -ENOMEM;
 67         }
 68 
 69         return 0;
 70 }
 71 late_initcall(tk_debug_sleep_time_init);
 72 
 73 void tk_debug_account_sleep_time(struct timespec64 *t)
 74 {
 75         /* Cap bin index so we don't overflow the array */
 76         int bin = min(fls(t->tv_sec), NUM_BINS-1);
 77 
 78         sleep_time_bin[bin]++;
 79         pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
 80                            (s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
 81 }
 82 
 83 

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