On Wed, Oct 16, 2019 at 03:11:51PM -0700, Dave Hansen wrote: > > From: Keith Busch <keith.busch@xxxxxxxxx> > > Migrating pages had been allocating the new page before it was actually > needed. Subsequent operations may still fail, which would have to handle > cleaning up the newly allocated page when it was never used. > > Defer allocating the page until we are actually ready to make use of > it, after locking the original page. This simplifies error handling, > but should not have any functional change in behavior. This is just > refactoring page migration so the main part can more easily be reused > by other code. Well, the functional change I see is that now we allocate a new page under page lock of old page. It *should* be fine, but it has to be call out in the commit message. -- Kirill A. Shutemov
