[PATCH v2 0/5] introduce kcompactd and stop compacting in kswapd

[Vlastimil Babka]

The previous RFC is here [1]. It didn't have a cover letter, so the description
and results are in the individual patches.

Changes since v1:
- do only sync compaction in kcompactd (Mel)
- only compact zones up to classzone_idx (Mel)
- move wakeup_kcompactd() call from patch 2 to patch 4 (Mel)
- Patch 3 is separate from Patch 2 for review purposes, although I would just
  fold it in the end (Mel)
- Patch 5 is new
- retested on 4.5-rc1 with 5 repeats, which removed some counter-intuitive
  results and added more confidence

[1] https://lkml.org/lkml/2016/1/26/558

Vlastimil Babka (5):
  mm, kswapd: remove bogus check of balance_classzone_idx
  mm, compaction: introduce kcompactd
  mm, memory hotplug: small cleanup in online_pages()
  mm, kswapd: replace kswapd compaction with waking up kcompactd
  mm, compaction: adapt isolation_suitable flushing to kcompactd

 include/linux/compaction.h        |  16 +++
 include/linux/mmzone.h            |   6 +
 include/linux/vm_event_item.h     |   1 +
 include/trace/events/compaction.h |  55 +++++++++
 mm/compaction.c                   | 230 +++++++++++++++++++++++++++++++++++++-
 mm/internal.h                     |   1 +
 mm/memory_hotplug.c               |  15 ++-
 mm/page_alloc.c                   |   3 +
 mm/vmscan.c                       | 147 ++++++++----------------
 mm/vmstat.c                       |   1 +
 10 files changed, 366 insertions(+), 109 deletions(-)

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2.7.0