[RFC 0/5] disable pcplists during page isolation

[Vlastimil Babka]

As per the discussions [1] [2] this is an attempt to implement David's
suggestion that page isolation should disable pcplists to avoid races. This is
done without extra checks in fast paths, as I mentioned should be possible in
the discussion, and explained in patch 5. Patches 1-4 are preparatory cleanups.

Note this is untested RFC for now. Based on v5.9-rc4 plus Pavel's patch [2]
(slated as a quick fix for mainline+stable).

[1] https://lore.kernel.org/linux-mm/20200901124615.137200-1-pasha.tatashin@xxxxxxxxxx/
[2] https://lore.kernel.org/linux-mm/20200903140032.380431-1-pasha.tatashin@xxxxxxxxxx/

Vlastimil Babka (5):
  mm, page_alloc: clean up pageset high and batch update
  mm, page_alloc: calculate pageset high and batch once per zone
  mm, page_alloc(): remove setup_pageset()
  mm, page_alloc: cache pageset high and batch in struct zone
  mm, page_alloc: disable pcplists during page isolation

 include/linux/gfp.h    |   1 +
 include/linux/mmzone.h |   2 +
 mm/internal.h          |   4 ++
 mm/memory_hotplug.c    |  24 +++----
 mm/page_alloc.c        | 138 ++++++++++++++++++++++-------------------
 mm/page_isolation.c    |  45 +++++++++++---
 6 files changed, 127 insertions(+), 87 deletions(-)

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2.28.0