On Tue 30-01-18 14:12:28, Zi Yan wrote: > On 30 Jan 2018, at 11:10, Michal Hocko wrote: [...] > I think the question is whether we need to hold mmap_sem for > migrate_pages(). Hugh also agrees it is not necessary on a separate > email. But it is held in the original code.
I would be really surprised if we really needed the lock. If we do, however, then we really need a very good explanation why. The code used to do so is not a valid reason. -- Michal Hocko SUSE Labs
