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55 lines
1.3 KiB
55 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* debugfs file to track time spent in suspend |
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* |
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* Copyright (c) 2011, Google, Inc. |
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*/ |
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#include <linux/debugfs.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/seq_file.h> |
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#include <linux/suspend.h> |
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#include <linux/time.h> |
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#include "timekeeping_internal.h" |
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#define NUM_BINS 32 |
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static unsigned int sleep_time_bin[NUM_BINS] = {0}; |
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static int tk_debug_sleep_time_show(struct seq_file *s, void *data) |
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{ |
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unsigned int bin; |
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seq_puts(s, " time (secs) count\n"); |
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seq_puts(s, "------------------------------\n"); |
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for (bin = 0; bin < 32; bin++) { |
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if (sleep_time_bin[bin] == 0) |
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continue; |
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seq_printf(s, "%10u - %-10u %4u\n", |
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bin ? 1 << (bin - 1) : 0, 1 << bin, |
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sleep_time_bin[bin]); |
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} |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time); |
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static int __init tk_debug_sleep_time_init(void) |
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{ |
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debugfs_create_file("sleep_time", 0444, NULL, NULL, |
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&tk_debug_sleep_time_fops); |
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return 0; |
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} |
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late_initcall(tk_debug_sleep_time_init); |
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void tk_debug_account_sleep_time(const struct timespec64 *t) |
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{ |
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/* Cap bin index so we don't overflow the array */ |
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int bin = min(fls(t->tv_sec), NUM_BINS-1); |
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sleep_time_bin[bin]++; |
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pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n", |
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(s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC); |
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} |
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