diff options
Diffstat (limited to '')
| -rw-r--r-- | kernel/time/timekeeping_debug.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c new file mode 100644 index 000000000..b73e8850e --- /dev/null +++ b/kernel/time/timekeeping_debug.c @@ -0,0 +1,55 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * debugfs file to track time spent in suspend + * + * Copyright (c) 2011, Google, Inc. + */ + +#include <linux/debugfs.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/seq_file.h> +#include <linux/suspend.h> +#include <linux/time.h> + +#include "timekeeping_internal.h" + +#define NUM_BINS 32 + +static unsigned int sleep_time_bin[NUM_BINS] = {0}; + +static int tk_debug_sleep_time_show(struct seq_file *s, void *data) +{ + unsigned int bin; + seq_puts(s, " time (secs) count\n"); + seq_puts(s, "------------------------------\n"); + for (bin = 0; bin < 32; bin++) { + if (sleep_time_bin[bin] == 0) + continue; + seq_printf(s, "%10u - %-10u %4u\n", + bin ? 1 << (bin - 1) : 0, 1 << bin, + sleep_time_bin[bin]); + } + return 0; +} +DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time); + +static int __init tk_debug_sleep_time_init(void) +{ + debugfs_create_file("sleep_time", 0444, NULL, NULL, + &tk_debug_sleep_time_fops); + return 0; +} +late_initcall(tk_debug_sleep_time_init); + +void tk_debug_account_sleep_time(const struct timespec64 *t) +{ + /* Cap bin index so we don't overflow the array */ + int bin = min(fls(t->tv_sec), NUM_BINS-1); + + sleep_time_bin[bin]++; + pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n", + (s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC); +} + |