Messages in this thread Patch in this message | | | From | Harry Pan <> | Subject | [PATCH v6 2/2] PM / sleep: measure the time of filesystems syncing | Date | Sun, 24 Feb 2019 14:17:54 +0800 |
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This patch gives the reader an intuitive metric of the time cost by the kernel issuing filesystems sync during system sleep; although developer can guess by the timestamp of next log or enable the ftrace power event for manual calculation, this manner is easier to read and benefits the automation script.
Signed-off-by: Harry Pan <harry.pan@intel.com> --- kernel/power/main.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/kernel/power/main.c b/kernel/power/main.c index a8a8e6ec57e6..a08dcc743f31 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -54,9 +54,15 @@ EXPORT_SYMBOL_GPL(unlock_system_sleep); void ksys_sync_helper(void) { - pr_info("Syncing filesystems ... "); + ktime_t start; + s64 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: %lld.%03lld seconds\n", + elapsed_msecs / MSEC_PER_SEC, + elapsed_msecs % MSEC_PER_SEC); } EXPORT_SYMBOL_GPL(ksys_sync_helper); -- 2.18.1
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