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* [PATCH 00/12] mm: Decouple folio-based vmemmap optimization from HugeTLB
@ 2026-10-20 11:52 Muchun Song
  2026-10-20 11:52 ` [PATCH 01/12] mm: hugetlb_vmemmap: remove HugeTLB-specific vmemmap optimization macros Muchun Song
  2026-10-20 11:58 ` [PATCH 02/12] mm: hugetlb_vmemmap: unify VMEMMAP_{SPLIT,REMAP}_NO_TLB_FLUSH Muchun Song
  0 siblings, 2 replies; 15+ messages in thread
From: Muchun Song @ 2026-10-20 11:52 UTC (permalink / raw)
  To: Oscar Salvador, Andrew Morton, Mike Rapoport
  Cc: Qi Zheng, Lance Yang, James Houghton, David Hildenbrand,
	Muchun Song, linux-mm, linux-kernel, Muchun Song

Section-based vmemmap optimization is implemented in sparse-vmemmap.c,
while folio-based optimization currently lives in hugetlb_vmemmap.c.
The latter is tightly coupled to HugeTLB-specific state even though the
underlying page-table remapping operates on one folio at a time.

To make these interfaces easier to maintain, the folio-based remapping
mechanics first need a boundary that is independent of HugeTLB-specific
state and raw address ranges. This will allow the mechanics to be moved
into a common vmemmap optimization layer alongside the section-based
interface.

This series establishes that boundary through three folio-oriented
operations, each with a distinct role:

  - vmemmap_optimize_folio() optimizes the vmemmap backing of a folio;
  - vmemmap_restore_folio() restores the vmemmap backing of a folio; and
  - vmemmap_pteify_folio() converts the vmemmap backing of a folio to
    PTE mappings.

Together, these operations encapsulate the address-range calculation and
remapping mechanics for a folio. HugeTLB wrappers retain policy decisions
such as eligibility, optimized state, batching and TLB flush handling.

Patches 1-8 generalize the underlying vmemmap remapping infrastructure by
removing HugeTLB-specific assumptions and simplifying remap control and
resource handling. Patches 9-12 then establish folio-oriented operations
for optimization, restoration and PTE conversion.

The implementation remains in hugetlb_vmemmap.c for now. A follow-up can
move the folio-based operations into the common vmemmap optimization layer
once the interface boundary is in place.

Muchun Song (12):
  mm: hugetlb_vmemmap: remove HugeTLB-specific vmemmap optimization
    macros
  mm: hugetlb_vmemmap: unify VMEMMAP_{SPLIT,REMAP}_NO_TLB_FLUSH
  mm: hugetlb_vmemmap: simplify vmemmap head page handling
  mm: hugetlb_vmemmap: generalize vmemmap page allocation
  mm: hugetlb_vmemmap: unify writable vmemmap page preparation
  mm: hugetlb_vmemmap: rename vmemmap_remap_pte() to
    vmemmap_optimize_pte()
  mm: hugetlb_vmemmap: simplify shared tail page handling
  mm: hugetlb_vmemmap: move alloc_vmemmap_page_list() next to its free
    helper
  mm: hugetlb_vmemmap: make vmemmap optimization folio-oriented
  mm: hugetlb_vmemmap: make vmemmap restoration folio-oriented
  mm: hugetlb_vmemmap: unify vmemmap range restoration
  mm: hugetlb_vmemmap: make vmemmap PTE conversion folio-oriented

 include/linux/vmemmap-optimization.h |  10 +-
 mm/hugetlb.c                         |   4 +-
 mm/hugetlb_vmemmap.c                 | 364 ++++++++++++---------------
 mm/hugetlb_vmemmap.h                 |  10 +-
 mm/mm_init.c                         |   6 +-
 mm/sparse-vmemmap.c                  |   5 +-
 6 files changed, 176 insertions(+), 223 deletions(-)


base-commit: 59d7f9ec14ad4b6f38c04d254f8f2bfb991e888e
-- 
2.54.0


^ permalink raw reply	[flat|nested] 15+ messages in thread
end of thread, other threads:[~2026-10-22  3:52 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2026-10-20 11:52 [PATCH 00/12] mm: Decouple folio-based vmemmap optimization from HugeTLB Muchun Song
2026-10-20 11:52 ` [PATCH 01/12] mm: hugetlb_vmemmap: remove HugeTLB-specific vmemmap optimization macros Muchun Song
2026-10-22  3:43   ` Lance Yang
2026-10-20 11:58 ` [PATCH 02/12] mm: hugetlb_vmemmap: unify VMEMMAP_{SPLIT,REMAP}_NO_TLB_FLUSH Muchun Song
2026-10-20 11:58   ` [PATCH 03/12] mm: hugetlb_vmemmap: simplify vmemmap head page handling Muchun Song
2026-10-20 11:58   ` [PATCH 04/12] mm: hugetlb_vmemmap: generalize vmemmap page allocation Muchun Song
2026-10-20 11:58   ` [PATCH 05/12] mm: hugetlb_vmemmap: unify writable vmemmap page preparation Muchun Song
2026-10-20 11:58   ` [PATCH 06/12] mm: hugetlb_vmemmap: rename vmemmap_remap_pte() to vmemmap_optimize_pte() Muchun Song
2026-10-20 11:58   ` [PATCH 07/12] mm: hugetlb_vmemmap: simplify shared tail page handling Muchun Song
2026-10-20 11:58   ` [PATCH 08/12] mm: hugetlb_vmemmap: move alloc_vmemmap_page_list() next to its free helper Muchun Song
2026-10-20 11:58   ` [PATCH 09/12] mm: hugetlb_vmemmap: make vmemmap optimization folio-oriented Muchun Song
2026-10-20 11:58   ` [PATCH 10/12] mm: hugetlb_vmemmap: make vmemmap restoration folio-oriented Muchun Song
2026-10-20 11:58   ` [PATCH 11/12] mm: hugetlb_vmemmap: unify vmemmap range restoration Muchun Song
2026-10-20 11:58   ` [PATCH 12/12] mm: hugetlb_vmemmap: make vmemmap PTE conversion folio-oriented Muchun Song
2026-10-22  3:52   ` [PATCH 02/12] mm: hugetlb_vmemmap: unify VMEMMAP_{SPLIT,REMAP}_NO_TLB_FLUSH Lance Yang

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