[dpdk-dev] [PATCH] log: do not drop debug logs at compile time

[Wiles, Keith]

Regards,
Keith

> On Oct 3, 2016, at 10:02 AM, Olivier Matz <olivier.matz at 6wind.com> wrote:
> 
> Hi Keith,
> 
> On 09/30/2016 05:48 PM, Wiles, Keith wrote:
>>> On Sep 30, 2016, at 4:33 AM, Thomas Monjalon <thomas.monjalon at 6wind.com> wrote:
>>> 
>>> 2016-09-16 09:43, Olivier Matz:
>>>> Today, all logs whose level is lower than INFO are dropped at
>>>> compile-time. This prevents from enabling debug logs at runtime using
>>>> --log-level=8.
>>>> 
>>>> The rationale was to remove debug logs from the data path at
>>>> compile-time, avoiding a test at run-time.
>>>> 
>>>> This patch changes the behavior of RTE_LOG() to avoid the compile-time
>>>> optimization, and introduces the RTE_LOG_DP() macro that has the same
>>>> behavior than the previous RTE_LOG(), for the rare cases where debug
>>>> logs are in the data path.
>>>> 
>>>> So it is now possible to enable debug logs at run-time by just
>>>> specifying --log-level=8. Some drivers still have special compile-time
>>>> options to enable more debug log. Maintainers may consider to
>>>> remove/reduce them.
>>>> 
>>>> Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
>>> 
>>> I think it is a good change.
>>> However I'm not sure we should take it for 16.11 as it was sent late and
>>> there is no review comment.
>>> It is neither really a fix nor really a feature.
>>> If there are some +1, and no opinions against, it will go in 16.11.
>>> Note that some drivers would need some changes to fully benefit of
>>> debug logs enabled at run-time.
>> 
>> Would this be easier to add a new LOG level instead say DEBUG_DATAPATH and then change the RTE_LOG to exclude the new log level?
>> 
>> 
> 
> The log levels are quite standard, I don't feel it would be very clear
> to have a new level for that. It would also prevent to have different
> log level inside data path.

I am not following you here. Having one more log level for DEBUG in the data path is not a big change and you can still have any other log level in the data or anyplace else for that matter.

> 
> Regards,
> Olivier