[dpdk-dev] [PATCH v2] mempool: reduce rte_mempool structure size
Olivier MATZ
olivier.matz at 6wind.com
Wed Feb 10 21:06:10 CET 2016
Hi Keith,
On 02/10/2016 07:35 PM, Wiles, Keith wrote:
>>> @@ -672,6 +704,24 @@ rte_mempool_count(const struct rte_mempool *mp)
>>> static unsigned
>>> rte_mempool_dump_cache(FILE *f, const struct rte_mempool *mp)
>>> {
>>> +#ifdef RTE_NEXT_ABI
>>> + unsigned lcore_id;
>>> + unsigned count = 0;
>>> + unsigned cache_count;
>>> +
>>> + fprintf(f, " cache infos:\n");
>>> + fprintf(f, " cache_size=%"PRIu32"\n", mp->cache_size);
>>> + if (mp->cache_size == 0)
>>> + return count;
>>> +
>>> + for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
>>> + cache_count = mp->local_cache[lcore_id].len;
>>> + fprintf(f, " cache_count[%u]=%u\n", lcore_id, cache_count);
>>> + count += cache_count;
>>> + }
>>> + fprintf(f, " total_cache_count=%u\n", count);
>>> + return count;
>>> +#else
>>> #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
>>> unsigned lcore_id;
>>> unsigned count = 0;
>>
>> I think in this case we could avoid to duplicate the code without
>> beeing unclear by using the proper #ifdefs:
>>
>> #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0 || defined(RTE_NEXT_ABI)
>> /* common code */
>> #ifdef RTE_NEXT_ABI
>> if (mp->cache_size == 0)
>> return count;
>> #endif
>> /* common code */
>> #else
>> ...
>> #endif
>
> Started looking at this change and the problem is I want to remove the ifdef RTE_MEMPOOL.. As well as the #else/#endif code. If I do as you suggest it does not appear to be clearer when someone goes back to remove the code, they may think the #ifdef RTE_MEMPOOL/#else/#endif are still required.
OK, makes sense.
>>> @@ -755,19 +793,25 @@ static inline void __attribute__((always_inline))
>>> __mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
>>> unsigned n, int is_mp)
>>> {
>>> +#ifndef RTE_NEXT_ABI /* Note: ifndef */
>>> #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
>>> +#endif /* RTE_NEXT_ABI */
>>> struct rte_mempool_cache *cache;
>>> uint32_t index;
>>> void **cache_objs;
>>> unsigned lcore_id = rte_lcore_id();
>>> uint32_t cache_size = mp->cache_size;
>>> uint32_t flushthresh = mp->cache_flushthresh;
>>> +#ifndef RTE_NEXT_ABI /* Note: ifndef */
>>> #endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
>>> +#endif /* RTE_NEXT_ABI */
>>
>> this looks strange... I think it does not work properly.
>> Why not
>> #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0 || defined(RTE_NEXT_ABI)
>
> Yes I agree the ifndef looks strange, but it should work as we want to remove the #ifdef RTE_MEMPOOL/#endif lines. This was the reason for the comment that it was a ifndef.
It's not only strange, it's also probably not what you want to do:
#ifndef RTE_NEXT_ABI /* Note: ifndef */
#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
#endif /* RTE_NEXT_ABI */
...
Here, the #endif corresponds to the second #if, not the first #ifdef.
Regards,
Olivier
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