On Mon, 27 Jan 2025 at 22:44, Joanne Koong <joannelkoong@xxxxxxxxx> wrote: > > Hi all, > > Recently, there was a long discussion upstream [1] on a patchset that > removes temp pages when handling writeback in FUSE. Temp pages are the > main bottleneck for write performance in FUSE and local benchmarks > showed approximately a 20% and 45% improvement in throughput for 4K > and 1M block size writes respectively when temp pages were removed. > More information on how FUSE uses temp pages can be found here [2]. > > In the discussion, there were concerns from mm regarding the > possibility of untrusted malicious or buggy fuse servers never > completing writeback, which would impede migration for those pages. > > It would be great to continue this discussion at LSF/MM and align on a > solution that removes FUSE temp pages altogether while satisfying mm’s > expectations for page migration. These are the most promising options > so far: This is more than just temp pages. The same issue exists for ->readahead(). This needs to be approached from both directions. This year I'll skip LSF but definitely interested in the discussion. So I'll watch LWN for any updates :) Thanks, Miklos
