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 next-20230621.
There is a minor conflict with patch 24 and the mm-unstable tree in
arch/m68k/mm/motorola.c - The end result of applying the patch should
be the same.
v5:
More Acked-bys :)
Cleanup some documentation wording and formatting
Add pt_rcu_head to ptdesc
Add memcg to ptdesc (and align it with struct page)
Ensure all get_free_page() callers prohibit HIGHMEM for 32 bit support.
Renamed folio_{set, clear}_table() to folio_{set, clear}_pgtable()
Removed pagetable_clear() as it is not necessary right now
pagetable_free() now sets page->mapping = NULL
Dropped s390 _refcount to _pt_frag_refcount conversion patch
Vishal Moola (Oracle) (33):
mm: Add PAGE_TYPE_OP folio functions
s390: Use _pt_s390_gaddr for gmap address tracking
pgtable: Create struct ptdesc
mm: add utility functions for ptdesc
mm: Convert pmd_pgtable_page() to 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 gmap 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 | 43 ++--
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 | 46 ++--
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/gmap.c | 207 ++++++++++--------
arch/s390/mm/pgalloc.c | 108 ++++-----
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 | 153 +++++++++----
include/linux/mm_types.h | 14 --
include/linux/page-flags.h | 30 ++-
include/linux/pgtable.h | 77 +++++++
mm/memory.c | 8 +-
39 files changed, 684 insertions(+), 453 deletions(-)
--
2.40.1