Merge tag 'arc-v3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[linux-2.6.git] / kernel / time / timekeeping_debug.c
blob802433a4f5eb7a6b73fa0442d44bf7f196ad6f9b
1 /*
2 * debugfs file to track time spent in suspend
4 * Copyright (c) 2011, Google, Inc.
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.
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.
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/time.h>
24 static unsigned int sleep_time_bin[32] = {0};
26 static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
28 unsigned int bin;
29 seq_puts(s, " time (secs) count\n");
30 seq_puts(s, "------------------------------\n");
31 for (bin = 0; bin < 32; bin++) {
32 if (sleep_time_bin[bin] == 0)
33 continue;
34 seq_printf(s, "%10u - %-10u %4u\n",
35 bin ? 1 << (bin - 1) : 0, 1 << bin,
36 sleep_time_bin[bin]);
38 return 0;
41 static int tk_debug_sleep_time_open(struct inode *inode, struct file *file)
43 return single_open(file, tk_debug_show_sleep_time, NULL);
46 static const struct file_operations tk_debug_sleep_time_fops = {
47 .open = tk_debug_sleep_time_open,
48 .read = seq_read,
49 .llseek = seq_lseek,
50 .release = single_release,
53 static int __init tk_debug_sleep_time_init(void)
55 struct dentry *d;
57 d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
58 &tk_debug_sleep_time_fops);
59 if (!d) {
60 pr_err("Failed to create sleep_time debug file\n");
61 return -ENOMEM;
64 return 0;
66 late_initcall(tk_debug_sleep_time_init);
68 void tk_debug_account_sleep_time(struct timespec *t)
70 sleep_time_bin[fls(t->tv_sec)]++;