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

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Date:	Mon, 17 Jun 2013 16:24:00 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Shuah Khan <shuah.kh@...sung.com>
cc:	pavel@....cz, <rjw@...k.pl>, <len.brown@...el.com>,
	<gregkh@...uxfoundation.org>, <joe@...ches.com>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<shuahkhan@...il.com>
Subject: Re: [PATCHv v3] power: Include additional information in pm_print_times

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.
> 
> dmesg output before the change:
> 
> [  164.390032] calling  1-1+ @ 69, parent: usb1
> [  164.390035] call 1-1+ returned 0 after 0 usecs
> 
> [  164.390352] calling  00:0a+ @ 2457, parent: pnp0
> [  164.390357] call 00:0a+ returned 0 after 3 usecs
> 
> [  164.390361] calling  00:09+ @ 2457, parent: pnp0
> [  164.496458] call 00:09+ returned 0 after 103500 usecs
> 
> [  164.496494] calling  00:05+ @ 2457, parent: pnp0
> [  164.496511] call 00:05+ returned 0 after 14 usecs
> 
> dmesg output after the change:
> 
> [  545.985394] usb 1-1: Start: type pm ops @ 68, parent: usb1
> [  545.987650] usb 1-1: End  : type pm ops @ 68, parent: usb1 time(2184 usecs) err(0)
> 
> [  545.982544] system 00:0a: Start: legacy bus pm ops @ 2391, parent: pnp0
> [  545.982554] system 00:0a: End  : legacy bus pm ops @ 2391, parent: pnp0 time(4 usecs) err(0)
> 
> [  545.982569] tpm_tis 00:09: Start: legacy bus pm ops @ 2391, parent: pnp0
> [  546.087017] tpm_tis 00:09: End  : legacy bus pm ops @ 2391, parent: pnp0 time(101936 usecs) err(0)
> 
> [  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

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