Michal Hocko [off-list ref] writes:

On Wed 25-07-18 13:11:15, John Allen wrote:
[...]

quoted

Does a failure in do_migrate_range indicate that the range is unmigratable
and the loop in __offline_pages should terminate and goto failed_removal? Or
should we allow a certain number of retrys before we
give up on migrating the range?

Unfortunatelly not. Migration code doesn't tell a difference between
ephemeral and permanent failures.

What's to stop an ephemeral failure happening repeatedly?

cheers