[dm-devel] dm-zoned performance degradation after apply 75d66ffb48efb3 ("dm zoned:, properly handle backing device failure")

[zhangxiaoxu (A)]

Hi all, when I 'mkfs.ext4' on the dmz device based on 10T smr disk,
it takes more than 10 hours after apply 75d66ffb48efb3 ("dm zoned:
properly handle backing device failure").

After delete the 'check_events' in 'dmz_bdev_is_dying', it just
take less than 12 mins.

I test it based on 4.19 branch.
Must we do the 'check_events' at mapping path, reclaim or metadata I/O?

Thanks.