On Fri, Aug 07, 2020 at 09:13:28PM +0800, Shiyang Ruan wrote: > This patchset is a try to resolve the problem of tracking shared page > for fsdax. > > Instead of per-page tracking method, this patchset introduces a query > interface: get_shared_files(), which is implemented by each FS, to > obtain the owners of a shared page. It returns an owner list of this > shared page. Then, the memory-failure() iterates the list to be able > to notify each process using files that sharing this page. > > The design of the tracking method is as follow: > 1. dax_assocaite_entry() associates the owner's info to this page I think that's the first problem with this design. dax_associate_entry is a horrendous idea which needs to be ripped out, not made more important. It's all part of the general problem of trying to do something on a per-page basis instead of per-extent basis.
