This patchset changes the API used by the MM to set up page table entries.
The four APIs are:
set_ptes(mm, addr, ptep, pte, nr)
update_mmu_cache_range(vma, addr, ptep, nr)
flush_dcache_folio(folio)
flush_icache_pages(vma, page, nr)
flush_dcache_folio() isn't technically new, but no architecture
implemented it, so I've done that for you. The old APIs remain around
but are mostly implemented by calling the new interfaces.
The new APIs are based around setting up N page table entries at once.
The N entries belong to the same PMD, the same folio and the same VMA,
so ptep++ is a legitimate operation, and locking is taken care of for
you. Some architectures can do a better job of it than just a loop,
but I have hesitated to make too deep a change to architectures I don't
understand well.
One thing I have changed in every architecture is that PG_arch_1 is now a
per-folio bit instead of a per-page bit. This was something that would
have to happen eventually, and it makes sense to do it now rather than
iterate over every page involved in a cache flush and figure out if it
needs to happen.
The point of all this is better performance, and Fengwei Yin has
measured improvement on x86. I suspect you'll see improvement on
your architecture too. Try the new will-it-scale test mentioned here:
https://lore.kernel.org/linux-mm/20230206140639.538867-5-fengwei.yin@xxxxxxxxx/
You'll need to run it on an XFS filesystem and have
CONFIG_TRANSPARENT_HUGEPAGE set.
For testing, I've only run the code on x86. If an x86->foo compiler
exists in Debian, I've built defconfig. I'm relying on the buildbots
to tell me what I missed, and people who actually have the hardware to
tell me if it actually works.
I'd like to get this into the MM tree soon after the current merge window
closes, so quick feedback would be appreciated.
Matthew Wilcox (Oracle) (26):
mm: Convert page_table_check_pte_set() to page_table_check_ptes_set()
mm: Add generic flush_icache_pages() and documentation
mm: Add folio_flush_mapping()
mm: Remove ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO
alpha: Implement the new page table range API
arc: Implement the new page table range API
arm64: Implement the new page table range API
csky: Implement the new page table range API
hexagon: Implement the new page table range API
ia64: Implement the new page table range API
loongarch: Implement the new page table range API
m68k: Implement the new page table range API
microblaze: Implement the new page table range API
mips: Implement the new page table range API
nios2: Implement the new page table range API
openrisc: Implement the new page table range API
parisc: Implement the new page table range API
powerpc: Implement the new page table range API
riscv: Implement the new page table range API
s390: Implement the new page table range API
superh: Implement the new page table range API
sparc32: Implement the new page table range API
sparc64: Implement the new page table range API
um: Implement the new page table range API
x86: Implement the new page table range API
xtensa: Implement the new page table range API
Yin Fengwei (4):
filemap: Add filemap_map_folio_range()
rmap: add folio_add_file_rmap_range()
mm: Convert do_set_pte() to set_pte_range()
filemap: Batch PTE mappings
Documentation/core-api/cachetlb.rst | 35 +++----
Documentation/filesystems/locking.rst | 2 +-
arch/alpha/include/asm/cacheflush.h | 10 ++
arch/alpha/include/asm/pgtable.h | 18 +++-
arch/arc/include/asm/cacheflush.h | 7 +-
arch/arc/include/asm/pgtable-bits-arcv2.h | 20 +++-
arch/arc/mm/cache.c | 61 +++++++-----
arch/arc/mm/tlb.c | 18 ++--
arch/arm/include/asm/cacheflush.h | 24 +++--
arch/arm/include/asm/pgtable.h | 5 +-
arch/arm/include/asm/tlbflush.h | 13 ++-
arch/arm/mm/copypage-v4mc.c | 5 +-
arch/arm/mm/copypage-v6.c | 5 +-
arch/arm/mm/copypage-xscale.c | 5 +-
arch/arm/mm/dma-mapping.c | 24 ++---
arch/arm/mm/fault-armv.c | 14 +--
arch/arm/mm/flush.c | 99 +++++++++++--------
arch/arm/mm/mm.h | 2 +-
arch/arm/mm/mmu.c | 14 ++-
arch/arm64/include/asm/cacheflush.h | 4 +-
arch/arm64/include/asm/pgtable.h | 25 +++--
arch/arm64/mm/flush.c | 36 +++----
arch/csky/abiv1/cacheflush.c | 32 ++++---
arch/csky/abiv1/inc/abi/cacheflush.h | 2 +
arch/csky/abiv2/cacheflush.c | 30 +++---
arch/csky/abiv2/inc/abi/cacheflush.h | 10 +-
arch/csky/include/asm/pgtable.h | 21 +++-
arch/hexagon/include/asm/cacheflush.h | 7 +-
arch/hexagon/include/asm/pgtable.h | 16 +++-
arch/ia64/hp/common/sba_iommu.c | 26 ++---
arch/ia64/include/asm/cacheflush.h | 14 ++-
arch/ia64/include/asm/pgtable.h | 14 ++-
arch/ia64/mm/init.c | 29 ++++--
arch/loongarch/include/asm/cacheflush.h | 2 +
arch/loongarch/include/asm/pgtable.h | 30 ++++--
arch/m68k/include/asm/cacheflush_mm.h | 26 +++--
arch/m68k/include/asm/pgtable_mm.h | 21 +++-
arch/m68k/mm/motorola.c | 2 +-
arch/microblaze/include/asm/cacheflush.h | 8 ++
arch/microblaze/include/asm/pgtable.h | 17 +++-
arch/microblaze/include/asm/tlbflush.h | 4 +-
arch/mips/include/asm/cacheflush.h | 32 ++++---
arch/mips/include/asm/pgtable.h | 36 ++++---
arch/mips/mm/c-r4k.c | 5 +-
arch/mips/mm/cache.c | 56 +++++------
arch/mips/mm/init.c | 17 ++--
arch/nios2/include/asm/cacheflush.h | 6 +-
arch/nios2/include/asm/pgtable.h | 27 ++++--
arch/nios2/mm/cacheflush.c | 61 ++++++------
arch/openrisc/include/asm/cacheflush.h | 8 +-
arch/openrisc/include/asm/pgtable.h | 27 +++++-
arch/openrisc/mm/cache.c | 12 ++-
arch/parisc/include/asm/cacheflush.h | 14 ++-
arch/parisc/include/asm/pgtable.h | 28 ++++--
arch/parisc/kernel/cache.c | 101 ++++++++++++++------
arch/powerpc/include/asm/book3s/pgtable.h | 10 +-
arch/powerpc/include/asm/cacheflush.h | 14 ++-
arch/powerpc/include/asm/kvm_ppc.h | 10 +-
arch/powerpc/include/asm/nohash/pgtable.h | 13 +--
arch/powerpc/include/asm/pgtable.h | 6 ++
arch/powerpc/mm/book3s64/hash_utils.c | 11 ++-
arch/powerpc/mm/cacheflush.c | 81 ++--------------
arch/powerpc/mm/nohash/e500_hugetlbpage.c | 3 +-
arch/powerpc/mm/pgtable.c | 51 +++++-----
arch/riscv/include/asm/cacheflush.h | 19 ++--
arch/riscv/include/asm/pgtable.h | 26 +++--
arch/riscv/mm/cacheflush.c | 11 +--
arch/s390/include/asm/pgtable.h | 34 +++++--
arch/sh/include/asm/cacheflush.h | 21 ++--
arch/sh/include/asm/pgtable.h | 6 +-
arch/sh/include/asm/pgtable_32.h | 16 +++-
arch/sh/mm/cache-j2.c | 4 +-
arch/sh/mm/cache-sh4.c | 26 +++--
arch/sh/mm/cache-sh7705.c | 26 +++--
arch/sh/mm/cache.c | 54 ++++++-----
arch/sh/mm/kmap.c | 3 +-
arch/sparc/include/asm/cacheflush_32.h | 9 +-
arch/sparc/include/asm/cacheflush_64.h | 18 ++--
arch/sparc/include/asm/pgtable_32.h | 15 ++-
arch/sparc/include/asm/pgtable_64.h | 25 ++++-
arch/sparc/kernel/smp_64.c | 56 +++++++----
arch/sparc/mm/init_32.c | 13 ++-
arch/sparc/mm/init_64.c | 78 ++++++++-------
arch/sparc/mm/tlb.c | 5 +-
arch/um/include/asm/pgtable.h | 15 ++-
arch/x86/include/asm/pgtable.h | 21 +++-
arch/xtensa/include/asm/cacheflush.h | 9 +-
arch/xtensa/include/asm/pgtable.h | 24 +++--
arch/xtensa/mm/cache.c | 83 +++++++++-------
include/asm-generic/cacheflush.h | 5 +
include/linux/cacheflush.h | 4 +-
include/linux/mm.h | 3 +-
include/linux/page_table_check.h | 14 +--
include/linux/pagemap.h | 26 ++++-
include/linux/rmap.h | 2 +
mm/filemap.c | 111 +++++++++++++---------
mm/memory.c | 27 +++---
mm/page_table_check.c | 14 +--
mm/rmap.c | 60 +++++++++---
mm/util.c | 2 +-
100 files changed, 1433 insertions(+), 838 deletions(-)
--
2.39.1
