linux-kernel - Re: [PATCHv v3] power: Include additional information in pm_print

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Date:	Tue, 18 Jun 2013 14:54:57 +0000
From:	Shuah Khan <shuah.kh@...sung.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"pavel@....cz" <pavel@....cz>, "rjw@...k.pl" <rjw@...k.pl>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"joe@...ches.com" <joe@...ches.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>,
	Shuah Khan <shuah.kh@...sung.com>
Subject: Re: [PATCHv v3] power: Include additional information in pm_print_times

On 06/17/2013 02:24 PM, Alan Stern wrote:
> On Mon, 17 Jun 2013, Shuah Khan wrote:
>
>> Change __device_suspend() path to include driver name and the ops that
>> get run for a device. This additional information helps associate the
>> driver and the type of pm_ops the device uses in the suspend path very
>> quickly, which will aid in debugging problems in suspend and resume paths.
>> Changed both start and end debug messages to include pm_ops information
>> and use dev_info() instead of pr_info(). Changed the end message to include
>> parent device information and have the same format as the start message.
>>

>>
>> [  546.087069] rtc_cmos 00:05: Start: legacy bus pm ops @ 2391, parent: pnp0
>> [  546.087084] rtc_cmos 00:05: End  : legacy bus pm ops @ 2391, parent: pnp0 time(11 usecs) err(0)
>
> If you don't mind a little more bike-shedding, I suggest formatting the
> return value and time in a shorter format, like this:
>
> [  545.987650] usb 1-1: End  : type pm ops @ 68, parent: usb1 -> 0, 2184 us
>
> Alan Stern
>
>

I am leaning towards leaving it the way it is for clarity, even though 
it is a bit longer? Changing it would make it too cryptic especially 
error return.

thanks,
-- Shuah

Shuah Khan, Linux Kernel Developer - Open Source Group Samsung Research 
America (Silicon Valley) shuah.kh@...sung.com | (970) 672-0658
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