On Tue, 28 May 2024 at 14:39, Peter-Jan Gootzen <pgootzen@xxxxxxxxxx> wrote: > I am not that familiar yet with the FUSE driver. What are these > listeners you are referring to? If I follow a FUSE file system operation > like fuse_statfs, I see a single-threaded path towards the > wake_pending_and_unlock of virtio-fs via fuse_simple_request. > Or are these listeners something from the virtiofsd implementation? I was thinking of the regular /dev/fuse interface, not virtiofs. For the /dev/fuse there can be multiple threads that call read(2) on the fuse fd, which I call "listeners" above. The design is outdated for both /dev/fuse and for virtiofs. When a request is created by the filesystem it shouldn't normally have to go through that fc->fiq bottleneck... I'll see if there's an easy fix for that. Thanks, Miklos
