projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 5c83545f CC |
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/time.h> | |
| 23 | ||
| 24 | static unsigned int sleep_time_bin[32] = {0}; | |
| 25 | ||
| 26 | static int tk_debug_show_sleep_time(struct seq_file *s, void *data) | |
| 27 | { | |
| 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]); | |
| 37 | } | |
| 38 | return 0; | |
| 39 | } | |
| 40 | ||
| 41 | static int tk_debug_sleep_time_open(struct inode *inode, struct file *file) | |
| 42 | { | |
| 43 | return single_open(file, tk_debug_show_sleep_time, NULL); | |
| 44 | } | |
| 45 | ||
| 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, | |
| 51 | }; | |
| 52 | ||
| 53 | static int __init tk_debug_sleep_time_init(void) | |
| 54 | { | |
| 55 | struct dentry *d; | |
| 56 | ||
| 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; | |
| 62 | } | |
| 63 | ||
| 64 | return 0; | |
| 65 | } | |
| 66 | late_initcall(tk_debug_sleep_time_init); | |
| 67 | ||
| 68 | void tk_debug_account_sleep_time(struct timespec *t) | |
| 69 | { | |
| 70 | sleep_time_bin[fls(t->tv_sec)]++; | |
| 71 | } | |
| 72 |