On Tue 23-03-21 18:03:07, Mike Kravetz wrote:
[...]

Since you brought up cgroups ... what is your opinion on lock hold time
in hugetlb_cgroup_css_offline?  We could potentially be calling
hugetlb_cgroup_move_parent for every hugetlb page while holding the lock
with interrupts disabled.

I am not familiar with hugetlb cgroup code TBH. But from a quick look
there is not much of heavy lifting there. If we find out that this is
really visible we can do the lock dance with cond_resched and retry with
the iteration again. Or is there any strong reason to process the list
in a single go?
-- 
Michal Hocko
SUSE Labs