On Mon, 13 Dec 2021 14:14:43 -1000, Tejun Heo wrote:
> The donation calculation logic assumes that the donor has non-zero
> after-donation hweight, so the lowest active hweight a donating cgroup can
> have is 2 so that it can donate 1 while keeping the other 1 for itself.
> Earlier, we only donated from cgroups with sizable surpluses so this
> condition was always true. However, with the precise donation algorithm
> implemented, f1de2439ec43 ("blk-iocost: revamp donation amount
> determination") made the donation amount calculation exact enabling even low
> hweight cgroups to donate.
>
> [...]
Applied, thanks!
[1/1] iocost: Fix divide-by-zero on donation from low hweight cgroup
commit: edaa26334c117a584add6053f48d63a988d25a6e
Best regards,
--
Jens Axboe
