[PATCH 0/5] Split huge PMD mapping of vmemmap pages

[Muchun Song]

In order to reduce the difficulty of code review in series[1]. We disable
huge PMD mapping of vmemmap pages when that feature is enabled. In this
series, we do not disable huge PMD mapping of vmemmap pages anymore. We
will split huge PMD mapping when needed.

[1] https://lore.kernel.org/linux-doc/20210510030027.56044-1-songmuchun@xxxxxxxxxxxxx/

Muchun Song (5):
  mm: hugetlb: introduce helpers to preallocate/free page tables
  mm: hugetlb: introduce helpers to preallocate page tables from bootmem
    allocator
  mm: sparsemem: split the huge PMD mapping of vmemmap pages
  mm: sparsemem: use huge PMD mapping for vmemmap pages
  mm: hugetlb: introduce CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON

 Documentation/admin-guide/kernel-parameters.txt |  10 +-
 arch/x86/mm/init_64.c                           |   8 +-
 fs/Kconfig                                      |  10 ++
 include/linux/hugetlb.h                         |  28 ++----
 include/linux/mm.h                              |   2 +-
 mm/hugetlb.c                                    |  42 +++++++-
 mm/hugetlb_vmemmap.c                            | 126 +++++++++++++++++++++++-
 mm/hugetlb_vmemmap.h                            |  25 +++++
 mm/memory_hotplug.c                             |   2 +-
 mm/sparse-vmemmap.c                             |  61 ++++++++++--
 10 files changed, 267 insertions(+), 47 deletions(-)

-- 
2.11.0