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PM / sleep: Measure the time of filesystems syncing

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Measure the filesystems sync time during system sleep more precisely.

Among other things, this allows the pr_cont() to be dropped from
ksys_sync_helper() and makes automatic system suspend and hibernation
profiling somewhat more straightforward.

Signed-off-by: Harry Pan <harry.pan@intel.com>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Harry Pan 2019-02-25 20:36:43 +08:00 committed by Rafael J. Wysocki
parent b5dee3130b
commit c64546b17b
1 changed files with 7 additions and 2 deletions
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9
kernel/power/main.c
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@ -54,9 +54,14 @@ EXPORT_SYMBOL_GPL(unlock_system_sleep);
void ksys_sync_helper(void) void ksys_sync_helper(void)
{ {
pr_info("Syncing filesystems ... "); ktime_t start;
long elapsed_msecs;
start = ktime_get();
ksys_sync(); ksys_sync();
pr_cont("done.\n"); elapsed_msecs = ktime_to_ms(ktime_sub(ktime_get(), start));
pr_info("Filesystems sync: %ld.%03ld seconds\n",
elapsed_msecs / MSEC_PER_SEC, elapsed_msecs % MSEC_PER_SEC);
} }
EXPORT_SYMBOL_GPL(ksys_sync_helper); EXPORT_SYMBOL_GPL(ksys_sync_helper);