[PATCH v2 0/2] mm: introduce per-order mTHP split counters

[Lance Yang]

Hi all,

Currently, the split counters in THP statistics no longer include
PTE-mapped mTHP. Therefore, we propose introducing per-order mTHP split
counters to monitor the frequency of mTHP splits. This will help developers
better analyze and optimize system performance.

/sys/kernel/mm/transparent_hugepage/hugepages-<size>/stats
        split
        split_failed
        split_deferred

---

Changes since v1 [1]
====================
 - mm: add per-order mTHP split counters
   - Update the changelog
   - Drop '_page' from mTHP split counter names (per David and Ryan)
   - Store the order of the folio in a variable and reuse it later
     (per Bang)
 - mm: add docs for per-order mTHP split counters
   - Improve the doc suggested by Ryan

[1] https://lore.kernel.org/linux-mm/20240424135148.30422-1-ioworker0@xxxxxxxxx

Lance Yang (2):
  mm: add per-order mTHP split counters
  mm: add docs for per-order mTHP split counters

 Documentation/admin-guide/mm/transhuge.rst | 16 ++++++++++++++++
 include/linux/huge_mm.h                    |  3 +++
 mm/huge_memory.c                           | 19 ++++++++++++++-----
 3 files changed, 33 insertions(+), 5 deletions(-)

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2.45.2