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| author | Harry Pan <harry.pan@intel.com> | 2019-02-25 20:36:43 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-04-02 10:53:19 +0200 |
| commit | c64546b17bc940643545dd34eac21f51764d633c (patch) | |
| tree | df9f9504498caaee4392800ea26f2276fe0161aa /kernel/power/main.c | |
| parent | b5dee3130bb4014511f5d0dd46855ed843e3fdc8 (diff) | |
| download | linux-c64546b17bc940643545dd34eac21f51764d633c.tar.gz linux-c64546b17bc940643545dd34eac21f51764d633c.tar.bz2 linux-c64546b17bc940643545dd34eac21f51764d633c.zip | |
PM / sleep: Measure the time of filesystems syncing
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>
Diffstat (limited to 'kernel/power/main.c')
| -rw-r--r-- | kernel/power/main.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c index 40472a7c5536..4f43e724f6eb 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -54,9 +54,14 @@ EXPORT_SYMBOL_GPL(unlock_system_sleep); void ksys_sync_helper(void) { - pr_info("Syncing filesystems ... "); + ktime_t start; + long elapsed_msecs; + + start = ktime_get(); 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); |