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

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Message-id: <B8EFE96D1287C24090BAD9D858E15E6156A8FE@sisaex02sj>
Date:	Fri, 14 Jun 2013 16:54:59 +0000
From:	Shuah Khan <shuah.kh@...sung.com>
To:	Greg KH <gregkh@...uxfoundation.org>,
	"joe@...ches.com" <joe@...ches.com>
Cc:	"pavel@....cz" <pavel@....cz>, "rjw@...k.pl" <rjw@...k.pl>,
	"len.brown@...el.com" <len.brown@...el.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>
Subject: Re: [PATCH] power: Include additional information in pm_print_times

On 06/14/2013 10:45 AM, Greg KH wrote:
> On Fri, Jun 14, 2013 at 10:33:45AM -0600, 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 driver
>> and the type of pm_ops the device uses in suspend path very quickly and
>> aid in debugging problems in suspend and resume paths. Added the additional
>> information at the end of the original 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:
>>
>> [  317.295499] calling 1-1+ @ 71, parent: usb1 driver: usb type pm ops
>> [  317.297671] call 1-1+ returned 0 after 2117 usecs
>>
>> [  318.134469] calling 00:0a+ @ 2941, parent: pnp0 driver: system legacy bus
>> [  318.134476] call 00:0a+ returned 0 after 5 usecs
>>
>> [  317.292894] calling 00:09+ @ 2941, parent: pnp0 driver: tpm_tis legacy bus pm ops
>> [  317.397315] call 00:09+ returned 0 after 101967 usecs
>>
>> [  317.397353] calling 00:05+ @ 2941, parent: pnp0 driver: rtc_cmos legacy bus pm ops
>> [  317.397369] call 00:05+ returned 0 after 13 usecs
>>
>> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
>> CC: Shuah Khan <shuahkhan@...il.com>
>> ---
>>   drivers/base/power/main.c |   35 ++++++++++++++++++++---------------
>>   1 file changed, 20 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
>> index 5a9b656..900266d 100644
>> --- a/drivers/base/power/main.c
>> +++ b/drivers/base/power/main.c
>> @@ -157,14 +157,15 @@ void device_pm_move_last(struct device *dev)
>>   	list_move_tail(&dev->power.entry, &dpm_list);
>>   }
>>
>> -static ktime_t initcall_debug_start(struct device *dev)
>> +static ktime_t initcall_debug_start(struct device *dev, char *info)
>>   {
>>   	ktime_t calltime = ktime_set(0, 0);
>>
>>   	if (pm_print_times_enabled) {
>> -		pr_info("calling  %s+ @ %i, parent: %s\n",
>> +		pr_info("calling %s+ @ %i, parent: %s driver: %s %s\n",
>>   			dev_name(dev), task_pid_nr(current),
>
> As we have a 'struct device' here, why aren't we just using dev_info()
> instead?  That will get us the "proper" structured logging information,
> and the needed information that you are looking for as well, right?
>
> thanks,
>
> greg k-h
>

Good point.I see Joe saying the same thing. Will take care of it.

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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