在 2024/7/2 22:25, Michal Koutný 写道:
On Fri, Jun 28, 2024 at 10:04:20AM GMT, Li Lingfeng <lilingfeng@xxxxxxxxxxxxxxx> wrote:
I think it may be more appropriate to remove the limit of bios after the
cgroup is deleted, rather than let the bios continue to be throttled by a
non-existent cgroup.
I'm not that familiar with this part -- can this also happen for IOs
submitted by an exited task? (In contrast to a running task migrated
elsewhere.)
Yes, IOs will be throttled no matter whether the task that delivers them
exits.
If the limit is set too low, and the original cgourp has been deleted, we
now have no way to make the bios complete immediately, but to wait for the
bios to slowly complete under the limit.
It makes some sense, it's not unlike reparenting of memcg objects, IIRC
flushed bios would actually be passed to a parent throtl_grp, right?
Yes, flushed bios would be throttled by the parent throtl_grp.
Thanks,
Michal
