5 Sep
2018
5 Sep
'18
6:57 a.m.
On Tue 04-09-18 10:00:36, Jerome Glisse wrote:
On Mon, Sep 03, 2018 at 07:56:54AM +0200, Michal Hocko wrote:
[...]
And THP migration is still a problem with 4.4 AFAICS. All other cases simply split the huge page but THP migration keeps it in one piece and as such it is theoretically broken as you have explained. So I would stick with what I posted with some more clarifications in the changelog if you think it is appropriate (suggestions welcome).
Reading code there is no THP migration in 4.4 only huge tlb migration.
Meh, you are right. For some reason I misread unmap_and_move_huge_page to be also for THP. Sorry for the conusion. My fault!
Then it would be indeed safer to use your backport.
--
Michal Hocko
SUSE Labs