[PATCH mm-unstable v7 00/31] Split ptdesc from struct page

Vishal Moola (Oracle)
2023-07-25T04:21:17Z

The MM subsystem is trying to shrink struct page. This patchset
introduces a memory descriptor for page table tracking - struct ptdesc.

This patchset introduces ptdesc, splits ptdesc from struct page, and
converts many callers of page table constructor/destructors to use ptdescs.

Ptdesc is a foundation to further standardize page tables, and eventually
allow for dynamic allocation of page tables independent of struct page.
However, the use of pages for page table tracking is quite deeply
ingrained and varied across archictectures, so there is still a lot of
work to be done before that can happen.

This is rebased on mm-unstable.

v7:
Drop s390 gmap ptdesc conversions - gmap is unecessary complication
that can be dealt with later
Be more thorough with ptdesc struct sanity checks and comments
Rebase onto mm-unstable

Vishal Moola (Oracle) (31):
mm: Add PAGE_TYPE_OP folio functions
pgtable: Create struct ptdesc
mm: add utility functions for ptdesc
mm: Convert pmd_pgtable_page() callers to use pmd_ptdesc()
mm: Convert ptlock_alloc() to use ptdescs
mm: Convert ptlock_ptr() to use ptdescs
mm: Convert pmd_ptlock_init() to use ptdescs
mm: Convert ptlock_init() to use ptdescs
mm: Convert pmd_ptlock_free() to use ptdescs
mm: Convert ptlock_free() to use ptdescs
mm: Create ptdesc equivalents for pgtable_{pte,pmd}_page_{ctor,dtor}
powerpc: Convert various functions to use ptdescs
x86: Convert various functions to use ptdescs
s390: Convert various pgalloc functions to use ptdescs
mm: Remove page table members from struct page
pgalloc: Convert various functions to use ptdescs
arm: Convert various functions to use ptdescs
arm64: Convert various functions to use ptdescs
csky: Convert __pte_free_tlb() to use ptdescs
hexagon: Convert __pte_free_tlb() to use ptdescs
loongarch: Convert various functions to use ptdescs
m68k: Convert various functions to use ptdescs
mips: Convert various functions to use ptdescs
nios2: Convert __pte_free_tlb() to use ptdescs
openrisc: Convert __pte_free_tlb() to use ptdescs
riscv: Convert alloc_{pmd, pte}_late() to use ptdescs
sh: Convert pte_free_tlb() to use ptdescs
sparc64: Convert various functions to use ptdescs
sparc: Convert pgtable_pte_page_{ctor, dtor}() to ptdesc equivalents
um: Convert {pmd, pte}_free_tlb() to use ptdescs
mm: Remove pgtable_{pmd, pte}_page_{ctor, dtor}() wrappers

Documentation/mm/split_page_table_lock.rst | 12 +-
.../zh_CN/mm/split_page_table_lock.rst | 14 +-
arch/arm/include/asm/tlb.h | 12 +-
arch/arm/mm/mmu.c | 7 +-
arch/arm64/include/asm/tlb.h | 14 +-
arch/arm64/mm/mmu.c | 7 +-
arch/csky/include/asm/pgalloc.h | 4 +-
arch/hexagon/include/asm/pgalloc.h | 8 +-
arch/loongarch/include/asm/pgalloc.h | 27 ++--
arch/loongarch/mm/pgtable.c | 7 +-
arch/m68k/include/asm/mcf_pgalloc.h | 47 +++---
arch/m68k/include/asm/sun3_pgalloc.h | 8 +-
arch/m68k/mm/motorola.c | 4 +-
arch/mips/include/asm/pgalloc.h | 32 ++--
arch/mips/mm/pgtable.c | 8 +-
arch/nios2/include/asm/pgalloc.h | 8 +-
arch/openrisc/include/asm/pgalloc.h | 8 +-
arch/powerpc/mm/book3s64/mmu_context.c | 10 +-
arch/powerpc/mm/book3s64/pgtable.c | 32 ++--
arch/powerpc/mm/pgtable-frag.c | 56 +++----
arch/riscv/include/asm/pgalloc.h | 8 +-
arch/riscv/mm/init.c | 16 +-
arch/s390/include/asm/pgalloc.h | 4 +-
arch/s390/include/asm/tlb.h | 4 +-
arch/s390/mm/pgalloc.c | 128 +++++++--------
arch/sh/include/asm/pgalloc.h | 9 +-
arch/sparc/mm/init_64.c | 17 +-
arch/sparc/mm/srmmu.c | 5 +-
arch/um/include/asm/pgalloc.h | 18 +--
arch/x86/mm/pgtable.c | 47 +++---
arch/x86/xen/mmu_pv.c | 2 +-
include/asm-generic/pgalloc.h | 88 +++++-----
include/asm-generic/tlb.h | 11 ++
include/linux/mm.h | 151 +++++++++++++-----
include/linux/mm_types.h | 18 ---
include/linux/page-flags.h | 30 +++-
include/linux/pgtable.h | 80 ++++++++++
mm/memory.c | 8 +-
38 files changed, 585 insertions(+), 384 deletions(-)

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2.40.1