[PATCH v5 0/2] integrate classzone_idx and high_zoneidx

[js1304]

From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

Hello,

This patchset is follow-up of the problem reported and discussed
two years ago [1, 2]. The problem this patchset solves is related to
the classzone_idx on the NUMA system. It causes a problem when
the lowmem reserve protection exists for some zones on a node
that do not exist on other nodes.

This problem is reported two years ago, and, at that time,
the solution got general agreements [2]. But, due to my laziness,
it's not upstreamed. Now, I tried again. This patchset is based on
next-20200416 git tree.

Thanks.

Changes on v5
- rebase onto the next-20200416
- add review tags

Changes on v4
- improve the commit message again

Changes on v3
- improve the commit message
- remove useless accessor, ac_classzone_idx()

[1]: http://lkml.kernel.org/r/20180102063528.GG30397@yexl-desktop
[2]: http://lkml.kernel.org/r/1525408246-14768-1-git-send-email-iamjoonsoo.kim@xxxxxxx

Joonsoo Kim (2):
  mm/page_alloc: use ac->high_zoneidx for classzone_idx
  mm/page_alloc: integrate classzone_idx and high_zoneidx

 include/linux/compaction.h        |   9 ++--
 include/linux/mmzone.h            |  12 ++---
 include/trace/events/compaction.h |  22 ++++----
 include/trace/events/vmscan.h     |  14 +++--
 mm/compaction.c                   |  64 +++++++++++------------
 mm/internal.h                     |  21 +++++---
 mm/memory_hotplug.c               |   6 +--
 mm/oom_kill.c                     |   4 +-
 mm/page_alloc.c                   |  60 +++++++++++-----------
 mm/slab.c                         |   4 +-
 mm/slub.c                         |   4 +-
 mm/vmscan.c                       | 105 ++++++++++++++++++++------------------
 12 files changed, 175 insertions(+), 150 deletions(-)

-- 
2.7.4