在 2022/04/13 19:12, Jan Kara 写道:
On Sat 05-03-22 17:11:54, Yu Kuai wrote:
Currently, bfq can't handle sync io concurrently as long as they
are not issued from root group. This is because
'bfqd->num_groups_with_pending_reqs > 0' is always true in
bfq_asymmetric_scenario().
This patchset tries to support concurrent sync io if all the sync ios
are issued from the same cgroup:
1) Count root_group into 'num_groups_with_pending_reqs', patch 1-5;
Seeing the complications and special casing for root_group I wonder: Won't
we be better off to create fake bfq_sched_data in bfq_data and point
root_group->sched_data there? AFAICS it would simplify the code
Hi,
That sounds an good idel, in this case we only need to make sure the
fake service tree will always be empty, which means we only need to
special casing bfq_active/idle_insert to the fake service tree.
Thanks,
Kuai
considerably as root_group would be just another bfq_group, no need to
special case it in various places, no games with bfqg->my_entity, etc.
Paolo, do you see any problem with that?
Honza
