On systems with multiple memory-tiers consisting of DRAM and CXL memory,
the OOM killer is not invoked properly.

This patchset includes a fix for the issue and an enhancement that makes
the issue reproducible with numa emulation.

Link: https://lore.kernel.org/lkml/20251022135735.246203-1-akinobu.mita@gmail.com/

Akinobu Mita (2):
  mm: memory-tiers, numa_emu: enable to create memory tiers using fake
    numa nodes
  mm/vmscan: don't demote if there is not enough free memory in the
    lower memory tier

 mm/numa_emulation.c | 26 ++++++++++++++++++++++++++
 mm/vmscan.c         | 15 ++++++++++++++-
 2 files changed, 40 insertions(+), 1 deletion(-)

-- 
2.43.0