Re: [dpdk-dev] [PATCH] eal: fix log level/type retrieving on a standard pthread

[Olivier MATZ <olivier.matz@6wind.com>]

Hi Ferruh,

On 05/11/2016 06:39 PM, Ferruh Yigit wrote:
> On 5/9/2016 5:13 PM, Olivier Matz wrote:
>> --- a/lib/librte_eal/common/eal_common_log.c
>> +++ b/lib/librte_eal/common/eal_common_log.c
>> @@ -98,9 +98,10 @@ static int history_enabled = 1;
>>   struct log_cur_msg {
>>   	uint32_t loglevel; /**< log level - see rte_log.h */
>>   	uint32_t logtype;  /**< log type  - see rte_log.h */
>> -} __rte_cache_aligned;
>
> Removing alignment seems not related the main purpose of the patch. Is
> this intentional?

Initially, the structure was cache-aligned so each element of
the table was stored in a separate cache line, avoiding a lcore
accessing its element to polute its neighbors (this was by the
way a bit overkill as it's not a performance-sensitive structure).

Using a __thread variable instead of a table naturally removes this
need because it will be stored in a specific section containing only
per-core data.

> I have tested with custom code, non-EAL thread have lcore_id value
> UINT32_MAX, which is > RTE_MAX_LCORE and rte_log_cur_msg_loglevel gives
> default log level as described in commit log. With this patch each
> thread gets its own log level.
>
> Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
>

Thanks for reviewing and testing.

Regards,
Olivier