[dpdk-dev] [PATCH v5 3/5] lib/mempool: allow page size aligned mempool

[Ye Xiaolong]

On 03/25, Andrew Rybchenko wrote:
>On 3/25/19 9:03 AM, Xiaolong Ye wrote:
>> Allow create a mempool with page size aligned base address.
>> 
>> Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
>> Signed-off-by: Xiaolong Ye <xiaolong.ye at intel.com>
>> ---
>>   lib/librte_mempool/rte_mempool.c | 3 +++
>>   lib/librte_mempool/rte_mempool.h | 1 +
>>   2 files changed, 4 insertions(+)
>> 
>> diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
>> index 683b216f9..171ba1057 100644
>> --- a/lib/librte_mempool/rte_mempool.c
>> +++ b/lib/librte_mempool/rte_mempool.c
>> @@ -543,6 +543,9 @@ rte_mempool_populate_default(struct rte_mempool *mp)
>>   		if (try_contig)
>>   			flags |= RTE_MEMZONE_IOVA_CONTIG;
>> +		if (mp->flags & MEMPOOL_F_PAGE_ALIGN)
>> +			align = RTE_MAX(align, (size_t)getpagesize());
>> +
>>   		mz = rte_memzone_reserve_aligned(mz_name, mem_size,
>>   				mp->socket_id, flags, align);
>> diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
>> index 7c9cd9a2f..75553b36f 100644
>> --- a/lib/librte_mempool/rte_mempool.h
>> +++ b/lib/librte_mempool/rte_mempool.h
>> @@ -264,6 +264,7 @@ struct rte_mempool {
>>   #define MEMPOOL_F_POOL_CREATED   0x0010 /**< Internal: pool is created. */
>>   #define MEMPOOL_F_NO_IOVA_CONTIG 0x0020 /**< Don't need IOVA contiguous objs. */
>>   #define MEMPOOL_F_NO_PHYS_CONTIG MEMPOOL_F_NO_IOVA_CONTIG /* deprecated */
>> +#define MEMPOOL_F_PAGE_ALIGN     0x0040 /**< Chunk's base address is page aligned */
>
>For me it sounds like mempool objects should be page aligned since
>MEMPOOL_F_NO_SPREAD, MEMPOOL_F_NO_CACHE_ALIGN and
>MEMPOOL_F_NO_IOVA_CONTIG say about object properties, not chunk.
>
>Personally I doubt that the final goal is just having chunk page aligned.

Hmm, how about naming it MEMPOOL_CHUNK_F_PAGE_ALIGN?

Thanks,
Xiaolong
>
>Andrew.