Issues

• Design: memory-fault tolerance and multi-region support for CXL memory

  multikernel/daxfs#29 · Filter by author congwang-mk opened on Sep 5, 2026

• Make replace-rename atomic so the tmp+rename checkpoint commit survives a kernel crash

  multikernel/daxfs#28 · Filter by author congwang-mk opened on Aug 17, 2026

• No ->fallocate: cannot preallocate overlay pages or reserve pool capacity

  enhancement
  multikernel/daxfs#27 · Filter by author congwang-mk opened on Aug 16, 2026

• swapon() on a daxfs file fails with -EINVAL: daxfs_aops has no ->read_folio

  enhancement
  multikernel/daxfs#25 · Filter by author congwang-mk opened on Aug 16, 2026

• daxfs_write_iter() takes no inode_lock: is unserialised i_size update intended?

  question
  multikernel/daxfs#26 · Filter by author congwang-mk opened on Aug 16, 2026

• Possible page leak: anonymous pages returned into a VM_PFNMAP vma (unverified)

  bughelp wanted
  multikernel/daxfs#24 · Filter by author congwang-mk opened on Aug 16, 2026

• daxfs_mem_sync() does not flush cache lines, and fsync() syncs the whole overlay

  enhancement
  multikernel/daxfs#23 · Filter by author congwang-mk opened on Aug 16, 2026

• Overlay 20-bit page offset caps writable files; reported as -ENOSPC instead of -EFBIG

  bugdocumentation
  multikernel/daxfs#22 · Filter by author congwang-mk opened on Aug 16, 2026

• daxfs_mem_ptr() bounds only the start offset, not the span the caller reads

  bug
  multikernel/daxfs#21 · Filter by author congwang-mk opened on Aug 16, 2026

• coherence.h: daxfs_cas64() does not byte-swap, so CAS loops never terminate on big-endian

  bug
  multikernel/daxfs#20 · Filter by author congwang-mk opened on Aug 16, 2026

• overlay_lookup() degrades to O(bucket_count) once the table fills

  bug
  multikernel/daxfs#19 · Filter by author congwang-mk opened on Aug 16, 2026