On Mon, Feb 6, 2023 at 3:24 PM Johannes Thumshirn <Johannes.Thumshirn@xxxxxxx> wrote: > > On 06.02.23 14:41, Hans Holmberg wrote: > > Out of the upstream file systems, btrfs and f2fs supports > > the zoned block device model. F2fs supports active data placement > > by separating cold from hot data which helps in reducing gc, > > but there is room for improvement. > > FYI, there's a patchset [1] from Boris for btrfs which uses different > size classes to further parallelize placement. As of now it leaves out > ZNS drives, as this can clash with the MOZ/MAZ limits but once active > zone tracking is fully bug free^TM we should look into using these > allocator hints for ZNS as well. > That looks like a great start! Via that patch series I also found Josef's fsperf repo [1], which is exactly what I have been looking for: a set of common tests for file system performance. I hope that it can be extended with longer-running tests doing several disk overwrites with application-like workloads. > The hot/cold data can be a 2nd placement hint, of cause, not just the > different size classes of an extent. Yes. I'll dig into the patches and see if I can figure out how that could be done. Cheers, Hans [1] https://github.com/josefbacik/fsperf
