Re: [PATCH v8 1/4] blk-throttle: fix that io throttle can only work for single bio

Tejun Heo
2022-08-25T18:15:47Z

On Wed, Aug 24, 2022 at 09:15:32AM +0800, Yu Kuai wrote:
> This patch actually set two flags when bio is throttled and
> dispatched, and only iops flag is cleared after the original bio is
> split. If only one flag can be used, the way that I come up with is
> that let iops limit become default, which means bio is always counted
> for iops limit each time blk_throtl_bio() is called. I'm not quite
> sure yet if iops limit can be counted excessively this way in some
> special scenario...

I don't think we have a path where we clone and re-submit other than
splitting. What do you think about renaming the flag to BIO_BPS_THROTTLED
and just assuming that IOPS is always applied?

Thanks.

--
tejun