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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869// 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
/* Incremented every time mg_floor is updated */DEFINE_PER_CPU(unsigned long, timekeeping_mg_floor_swaps);
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);}
unsigned long timekeeping_get_mg_floor_swaps(void){ unsigned long sum = 0; int cpu;
for_each_possible_cpu(cpu) sum += data_race(per_cpu(timekeeping_mg_floor_swaps, cpu));
return sum;}