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PM / timekeeping: Print debug messages when requested 

The messages printed by tk_debug_account_sleep_time() are basically
useful for system sleep debugging, so print them only when the other
debug messages from the core suspend/hibernate code are enabled.

While at it, make it clear that the messages from
tk_debug_account_sleep_time() are about timekeeping suspend
duration, because in general timekeeping may be suspeded and
resumed for multiple times during one system suspend-resume cycle.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2017-07-23 00:03:43 +02:00
parent 8915aa2042
commit cb08e0353c
3 changed files with 18 additions and 7 deletions
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10
include/linux/suspend.h
View File

@ -492,16 +492,22 @@ static inline void unlock_system_sleep(void) {}
#ifdef CONFIG_PM_SLEEP_DEBUG
extern bool pm_print_times_enabled;
extern __printf(1, 2) void pm_pr_dbg(const char *fmt, ...);
extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
#else
#define pm_print_times_enabled (false)
#include <linux/printk.h>
#define pm_pr_dbg(fmt, ...) \
#define __pm_pr_dbg(defer, fmt, ...) \
no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
#endif
#define pm_pr_dbg(fmt, ...) \
__pm_pr_dbg(false, fmt, ##__VA_ARGS__)
#define pm_deferred_pr_dbg(fmt, ...) \
__pm_pr_dbg(true, fmt, ##__VA_ARGS__)
#ifdef CONFIG_PM_AUTOSLEEP
/* kernel/power/autosleep.c */

10
kernel/power/main.c
View File

@ -388,13 +388,14 @@ static ssize_t pm_debug_messages_store(struct kobject *kobj,
power_attr(pm_debug_messages);
/**
* pm_pr_dbg - Print a suspend debug message to the kernel log.
* __pm_pr_dbg - Print a suspend debug message to the kernel log.
* @defer: Whether or not to use printk_deferred() to print the message.
* @fmt: Message format.
*
* The message will be emitted if enabled through the pm_debug_messages
* sysfs attribute.
*/
void pm_pr_dbg(const char *fmt, ...)
void __pm_pr_dbg(bool defer, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
@ -407,7 +408,10 @@ void pm_pr_dbg(const char *fmt, ...)
vaf.fmt = fmt;
vaf.va = &args;
printk(KERN_DEBUG "PM: %pV", &vaf);
if (defer)
printk_deferred(KERN_DEBUG "PM: %pV", &vaf);
else
printk(KERN_DEBUG "PM: %pV", &vaf);
va_end(args);
}

5
kernel/time/timekeeping_debug.c
View File

@ -19,6 +19,7 @@
#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"
@ -75,7 +76,7 @@ void tk_debug_account_sleep_time(struct timespec64 *t)
int bin = min(fls(t->tv_sec), NUM_BINS-1);
sleep_time_bin[bin]++;
printk_deferred(KERN_INFO "Suspended for %lld.%03lu seconds\n",
(s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
(s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
}