[$] Improving FUSE writeback performance

In a combined filesystem and memory-management session at
the 2025 Linux Storage, Filesystem, Memory
Management, and BPF Summit (LSFMM+BPF), Joanne Koong led a discussion on
improving the writeback performance for the Filesystem in
Userspace (FUSE) layer. Writeback is how data that is written to the
filesystem is actually flushed to the disk; it is the process of writing
dirty pages from the page cache to storage. The current FUSE
implementation allocates unmovable memory, then copies the dirty data to it
before initiating writeback, which is slow; Koong wanted to change that
behavior. Since the session, she has posted a
patch set that has been applied
by FUSE maintainer Miklos Szeredi.