[PATCH v3 0/2] mm: introduce per-order mTHP split counters

[Lance Yang <ioworker0@gmail.com>]

Hi all,

At present, the split counters in THP statistics no longer include
PTE-mapped mTHP. Therefore, we want to introduce per-order mTHP split
counters to monitor the frequency of mTHP splits. This will assist
developers in better analyzing and optimizing system performance.

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

---

Changes since v2 [2]
====================
 - mm: add per-order mTHP split counters
   - Pick AB from Barry - thanks!
   - Pick RB from Baolin - thanks!
   - Pick RB from Ryan - thanks!
   - Make things more readable (per Barry and Baolin)
 - mm: add docs for per-order mTHP split counters
   - Pick RB from Barry - thanks!
   - Improve the doc as suggested by Ryan
   - Remove the outdated note (per Ryan)

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 as suggested by Ryan

[1] https://lore.kernel.org/linux-mm/20240424135148.30422-1-ioworker0@gmail.com
[2] https://lore.kernel.org/linux-mm/20240628130750.73097-1-ioworker0@gmail.com

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 | 20 ++++++++++++++++----
 include/linux/huge_mm.h                    |  3 +++
 mm/huge_memory.c                           | 12 ++++++++++--
 3 files changed, 29 insertions(+), 6 deletions(-)


base-commit: ec34ecf3924f09a694e5c7d8d7e785b82f67f9f0
-- 
2.45.2