[RFC PATCH 0/3] mm/compaction: honour compact_unevictable_allowed in mlock race and alloc_contig path

[Wandun Chen <chenwandun1@gmail.com>]

From: Wandun Chen <chenwandun@lixiang.com>

vm.compact_unevictable_allowed=0 is meant to keep compaction from
touching unevictable folios. In practice there are still two paths
where it does not take effect. This series fixes them and adds a
tracepoint to make such issues easier to diagnose in the future.

Wandun Chen (3):
  mm/compaction: skip isolate mlocked folios when
    compact_unevictable_allowed=0
  mm/compaction: add per-folio isolation tracepoint
  mm/compaction: respect compact_unevictable_allowed in alloc_contig
    path

 include/linux/compaction.h        |  6 ++++++
 include/trace/events/compaction.h | 26 ++++++++++++++++++++++++++
 mm/compaction.c                   | 14 +++++++++++---
 mm/internal.h                     |  1 +
 mm/page_alloc.c                   |  2 ++
 5 files changed, 46 insertions(+), 3 deletions(-)

-- 
2.43.0