pool->sector->blocks
pool is organized as sectors , and new sectors ared added when there is more blocks needed.
mem_block_creat_pool(zg, blk_size , no_of_block,no_of_sectors)
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no_of_blocks :no_of_blocks per sector
no_of_sectors:max nomber _of_sectors per pool, if 0, the pool will creat as many of sectors as the system could afford .
return : pointer to a pool management instance
mem_block_creat_pool(zg, blk_size , no_of_blocks, no_of_sectors)
{
}