shmsize += sizeof(struct commit_counters_hot) * num_subbuf;
shmsize += offset_align(shmsize, __alignof__(struct commit_counters_cold));
shmsize += sizeof(struct commit_counters_cold) * num_subbuf;
shmsize += sizeof(struct commit_counters_hot) * num_subbuf;
shmsize += offset_align(shmsize, __alignof__(struct commit_counters_cold));
shmsize += sizeof(struct commit_counters_cold) * num_subbuf;