On 3/25/20 7:07 AM, Konstantin Khlebnikov wrote:

Simplified estimation for io_ticks introduced in patch
https://lore.kernel.org/linux-block/20181206164122.2166-5-snitzer@redhat.com/ (local)
could be very inaccurate for request longer than jiffy (i.e. any HDD)

There is at least one another report about this:
https://lore.kernel.org/linux-block/20200324031942.GA3060@ming.t460p/ (local)
See detail in comment for first patch.

v1: https://lore.kernel.org/lkml/155413438394.3201.15211440151043943989.stgit@buzz/ (local)
v2: https://lore.kernel.org/lkml/158314549775.1788.6529015932237292177.stgit@buzz/ (local)
v3: https://lore.kernel.org/lkml/158503038812.1955.7827988255138056389.stgit@buzz/ (local)
 * update documentation
 * rebase to current linux-next
 * fix compilation for CONFIG_SMP=n
v4:
 * rebase to for-5.7/block
 * make part_stat_read_all static in block/genhd.c

Applied for 5.7, thanks.

-- 
Jens Axboe