From: Barry Song <v-songbaohua@xxxxxxxx> Knowing the number of anon mTHPs in the system is crucial for performance analysis. It helps in understanding the ratio and distribution of mTHPs versus small folios throughout the system. Additionally, partial unmapping by userspace can lead to significant waste of mTHPs over time and increase memory reclamation pressure. We need this information for comprehensive system tuning. -v2: * don't rely on rmap to implement - 1, uses folio_free, split etc. Thanks for David's comment; * rename sys counters and refine doc. Thanks for Ryan's comment; -v1: https://lore.kernel.org/all/20240808010457.228753-1-21cnbao@xxxxxxxxx/ Barry Song (2): mm: collect the number of anon large folios mm: collect the number of anon large folios on split_deferred list Documentation/admin-guide/mm/transhuge.rst | 10 ++++++++++ include/linux/huge_mm.h | 16 ++++++++++++++-- mm/huge_memory.c | 19 ++++++++++++++++--- mm/migrate.c | 4 ++++ mm/page_alloc.c | 5 ++++- mm/rmap.c | 1 + 6 files changed, 49 insertions(+), 6 deletions(-) -- 2.34.1
