Re: [PATCH v2] power: new trace event to print device suspend and resume time

[Joe Perches <joe@perches.com>]

On Wed, 2013-07-17 at 09:57 -0600, Shuah Khan wrote:
> A new trace event is added to pm events to print time it takes to suspend and
> resume a device. It generates trace message that includes device, driver,
> parent information in addition to the type of pm ops invoked as well as the
> pm event and error status from the pm ops. Example trace below:
> 
> bash-2484  [001] ....   907.330148: device_pm_report_time: backlight acpi_video0 parent=0000:00:02.0 state=freeze ops=class  usecs=0 err=0
> 
> bash-2484  [001] ....   909.906743: device_pm_report_time: backlight acpi_video0 parent=0000:00:02.0 state=restore ops=class  usecs=0 err=0

Hi again Shuah.

A few things:

> diff --git a/include/trace/events/power.h b/include/trace/events/power.h
[]
> +	TP_printk("%s %s parent=%s state=%s ops=%s usecs=%lld err=%d\n",

As I wrote before, do not end a TP_printk with "\n",

All TP_printks are self-contained and are not possible
to use a thing like pr_cont so no newline is ever used.

Use:

	TP_printk("%s %s parent=%s state=%s ops=%s usecs=%lld err=%d",

Given the data is in nsecs, why use usecs for the time?
I think full resolution would be better.

Why are there two spaces after "ops=class"? One would be more normal.