Thanks for you time.
Tejun Heo wrote on 2021/7/30 1:11 上午:
> Hello,
>
> On Wed, Jul 28, 2021 at 05:01:41PM +0800, brookxu wrote:
>> diff --git a/block/blk-merge.c b/block/blk-merge.c
>> index a11b3b5..86ff943 100644
>> --- a/block/blk-merge.c
>> +++ b/block/blk-merge.c
>> @@ -348,6 +348,8 @@ void __blk_queue_split(struct bio **bio, unsigned int *nr_segs)
>> trace_block_split(split, (*bio)->bi_iter.bi_sector);
>> submit_bio_noacct(*bio);
>> *bio = split;
>> +
>> + blk_throtl_recharge_bio(*bio);
>
> Can you rename this blk_throtl_charge_bio_split()?
Ok, i will do it in next version.
>> @@ -524,6 +537,11 @@ static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp,
>> tg->idletime_threshold = DFL_IDLE_THRESHOLD;
>> tg->idletime_threshold_conf = DFL_IDLE_THRESHOLD;
>>
>> + atomic_set(&tg->io_split_cnt[0], 0);
>> + atomic_set(&tg->io_split_cnt[1], 0);
>> + atomic_set(&tg->last_io_split_cnt[0], 0);
>> + atomic_set(&tg->last_io_split_cnt[1], 0);
>
> We likely don't need these. pd's zeroed on allocation.
Right, i will remove these init code.
>> @@ -877,10 +900,19 @@ static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw)
>> else
>> tg->bytes_disp[rw] = 0;
>>
>> - if (tg->io_disp[rw] >= io_trim)
>> + if (tg_io_disp(tg, rw) >= io_trim) {
>
> Instead of checking this in multiple places, would it be simpler to transfer
> the atomic counters to the existing counters whenever we enter blk-throtl
> and leave the rest of the code as-is?
If we do this, we need to do similar processing on the bio submission path and the bio
resubmission path in pending_timer. It seems that the code is more complicated?
> Thanks.
>
