On Wed, Aug 25, 2021 at 10:40:53AM -0700, Neeraj Singh wrote: > I'd expect syncfs to suffer from the noisy-neighbor problem that Linus > alluded to on the big > thread you kicked off. It does. That being said I suspect in most developer workstation use cases it will still be a win. Maybe I'll look into implemeting it after your series lands. > If someone adds a more targeted bulk sync interface to the Linux > kernel, I'm sure Git could be > changed to use it. Maybe an fcntl(2) interface that initiates > writeback and registers completion with an > eventfd. That is in general very hard to do with how the VM-level writeback occurs. In the file system itself it could work much better, e.g. for XFS we write the log up to a specific sequence number and could notify when doing that.
