netdev - Re: [PATCH net-next] ibmvnic: Increase driver logging

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Date:   Thu, 16 Jul 2020 10:59:58 -0500
From:   Thomas Falcon <tlfalcon@...ux.ibm.com>
To:     David Miller <davem@...emloft.net>, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        drt@...ux.ibm.com
Subject: Re: [PATCH net-next] ibmvnic: Increase driver logging

On 7/15/20 8:29 PM, David Miller wrote:
> From: Jakub Kicinski <kuba@...nel.org>
> Date: Wed, 15 Jul 2020 17:06:32 -0700
>
>> On Wed, 15 Jul 2020 18:51:55 -0500 Thomas Falcon wrote:
>>>   	free_netdev(netdev);
>>>   	dev_set_drvdata(&dev->dev, NULL);
>>> +	netdev_info(netdev, "VNIC client device has been successfully removed.\n");
>> A step too far, perhaps.
>>
>> In general this patch looks a little questionable IMHO, this amount of
>> logging output is not commonly seen in drivers. All the the info
>> messages are just static text, not even carrying any extra information.
>> In an era of ftrace, and bpftrace, do we really need this?
> Agreed, this is too much.  This is debugging, and thus suitable for tracing
> facilities, at best.

Thanks for your feedback. I see now that I was overly aggressive with 
this patch to be sure, but it would help with narrowing down problems at 
a first glance, should they arise. The driver in its current state logs 
very little of what is it doing without the use of additional debugging 
or tracing facilities. Would it be worth it to pursue a less aggressive 
version or would that be dead on arrival? What are acceptable driver 
operations to log at this level?

Thanks,

Tom