On Wed, 5 Jun 2024 09:30:59 +0800 Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> wrote: > > protection to catch successive writes (mprotect, uffd-wp) -- and > > they all > > face the same issue regarding R/W access via GUP (FOLL_PIN and > > FOLL_GET). > > User space better be aware that using read-protection to catch > > writes to > > a page can miss writes via GUP. Softdirt tracking cannot reliably > > catch > > modifications via GUP after clearing softdirty and returning to user > > space. > > > > But I understand if you want to be careful :) So I might send that patch > > out at > > some point myself ... > > > > Thank for your detail explanation, let's wait it out. Did we wait long enough? Should we move ahead with this change or should we drop it and have another run at it?
