On Thu, Oct 17, 2024 at 03:31:48PM GMT, Miklos Szeredi wrote: > On Wed, 16 Oct 2024 at 23:27, Shakeel Butt <shakeel.butt@xxxxxxxxx> wrote: > > > Why is it bad? I can understand fuse server getting blocked on fuse > > folios is bad but why it is bad for other applications/tasks? I am > > wondering network filesystems have to handle similar situation then why > > is it bad just for fuse? > > You need privileges (physical access) to unplug the network cable. > You don't need privileges (in most setups) to run a fuse server. I feel like this is too much restrictive and I am still not sure why blocking on fuse folios served by non-privileges fuse server is worse than blocking on folios served from the network. > > > It might be a bit more than sprinkling. The reclaim code has to activate > > the folio to avoid reclaiming the folio in near future. I am not sure > > what we will need to do for move_pages() syscall. > > Maybe move_pages() is okay, because it is explicitly targeting a fuse > mmap. Is this the only way to trigger MIGRATE_SYNC? It can happen through migrate_pages(), mbind(), compaction which can caused by hugepage allcations.
