On 6/5/20 10:19 PM, jeffm@suse.com wrote:

The i/o accounting published in /proc/diskstats for mdraid is currently
broken.  md_make_request does the accounting for every bio passed but
when a bio needs to be split, all the split bios are also submitted
through md_make_request, resulting in multiple accounting.

Hi Jeff,

I sent a patch a few days ago which should fix this issue. Can you check
it out?

https://marc.info/?l=linux-raid&m=159102814820539

Thanks,
Artur