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Message-ID: <c2accb5d-33f6-404b-9298-6b9e8bf24a9b@gmail.com> Date: Tue, 30 Jul 2024 16:10:23 +0800 From: Alex Shi <seakeel@...il.com> To: alexs@...nel.org, Will Deacon <will@...nel.org>, "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>, Nick Piggin <npiggin@...il.com>, Peter Zijlstra <peterz@...radead.org>, Russell King <linux@...linux.org.uk>, Catalin Marinas <catalin.marinas@....com>, Brian Cain <bcain@...cinc.com>, WANG Xuerui <kernel@...0n.name>, Geert Uytterhoeven <geert@...ux-m68k.org>, Jonas Bonn <jonas@...thpole.se>, Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>, Stafford Horne <shorne@...il.com>, Michael Ellerman <mpe@...erman.id.au>, Naveen N Rao <naveen@...nel.org>, Paul Walmsley <paul.walmsley@...ive.com>, Albert Ou <aou@...s.berkeley.edu>, Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>, Bibo Mao <maobibo@...ngson.cn>, Baolin Wang <baolin.wang@...ux.alibaba.com>, linux-arch@...r.kernel.org, linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org, loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org, linux-openrisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org, Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, Qi Zheng <zhengqi.arch@...edance.com>, Vishal Moola <vishal.moola@...il.com>, "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>, Kemeng Shi <shikemeng@...weicloud.com>, Lance Yang <ioworker0@...il.com>, Peter Xu <peterx@...hat.com>, Barry Song <baohua@...nel.org>, linux-s390@...r.kernel.org Cc: Guo Ren <guoren@...nel.org>, Christophe Leroy <christophe.leroy@...roup.eu>, Palmer Dabbelt <palmer@...belt.com>, Mike Rapoport <rppt@...nel.org>, Oscar Salvador <osalvador@...e.de>, Alexandre Ghiti <alexghiti@...osinc.com>, Jisheng Zhang <jszhang@...nel.org>, Samuel Holland <samuel.holland@...ive.com>, Anup Patel <anup@...infault.org>, Josh Poimboeuf <jpoimboe@...nel.org>, Breno Leitao <leitao@...ian.org>, Alexander Gordeev <agordeev@...ux.ibm.com>, Gerald Schaefer <gerald.schaefer@...ux.ibm.com>, Hugh Dickins <hughd@...gle.com>, David Hildenbrand <david@...hat.com>, Ryan Roberts <ryan.roberts@....com>, Matthew Wilcox <willy@...radead.org> Subject: Re: [RFC PATCH 00/18] use struct ptdesc to replace pgtable_t BTW, the patchset based on the latest git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm mm-unstable branch. On 7/30/24 2:46 PM, alexs@...nel.org wrote: > From: Alex Shi <alexs@...nel.org> > > We have struct ptdesc for page table descriptor a year ago, but it > has no much usages in kernel, while pgtable_t is used widely. > > The pgtable_t is typedefed as 'pte_t *' in sparc, s390, powerpc and m68k > except SUN3, others archs are all same as 'struct page *'. > > These blocks the conception and code update for page table descriptor to > struct ptdesc. > > So, the simple idea to push the ptdesc conception forward is to update > all pgtable_t by ptdesc or pte_t pointer. But this needs widely > knowledges for most all of different archs. Common code change is easy > for include/ and mm/ directory, but it's hard in all archs. > > Thanks for intel LKP framework, I fixed most all of build issues except > a bug on powerpc which reports a "struct ptdesc *" incompatible with > struct ptdesc *' pointer issue... > > Another trouble is pmd_pgtable() conversion in the last patch. > Maybe some of arch need define theirself own pmd_ptdesc()? > > This patchset is immature, even except above 2 issues, I just tested > virutal machine booting and kselftest mm on x86 and arm64. > > Anyway any input are appreciated! > > Thanks > Alex > > Alex Shi (18): > mm/pgtable: use ptdesc in pte_free_now/pte_free_defer > mm/pgtable: convert ptdesc.pmd_huge_pte to ptdesc pointer > fs/dax: use ptdesc in dax_pmd_load_hole > mm/thp: use ptdesc pointer in __do_huge_pmd_anonymous_page > mm/thp: use ptdesc in do_huge_pmd_anonymous_page > mm/thp: convert insert_pfn_pmd and its caller to use ptdesc > mm/thp: use ptdesc in copy_huge_pmd > mm/memory: use ptdesc in __pte_alloc > mm/pgtable: fully use ptdesc in pte_alloc_one series functions > mm/pgtable: pass ptdesc to pte_free() > mm/pgtable: introduce ptdesc_pfn and use ptdesc in free_pte_range() > mm/thp: pass ptdesc to set_huge_zero_folio function > mm/pgtable: return ptdesc pointer in pgtable_trans_huge_withdraw > mm/pgtable: use ptdesc in pgtable_trans_huge_deposit > mm/pgtable: pass ptdesc to pmd_populate > mm/pgtable: pass ptdesc to pmd_install > mm: convert vmf.prealloc_pte to struct ptdesc pointer > mm/pgtable: pass ptdesc in pte_free_defer > > arch/alpha/include/asm/pgalloc.h | 4 +- > arch/arc/include/asm/pgalloc.h | 4 +- > arch/arm/include/asm/pgalloc.h | 13 +-- > arch/arm/include/asm/tlb.h | 4 +- > arch/arm/mm/pgd.c | 2 +- > arch/arm64/include/asm/pgalloc.h | 4 +- > arch/arm64/include/asm/tlb.h | 4 +- > arch/csky/include/asm/pgalloc.h | 4 +- > arch/hexagon/include/asm/pgalloc.h | 8 +- > arch/loongarch/include/asm/pgalloc.h | 8 +- > arch/m68k/include/asm/motorola_pgalloc.h | 12 +- > arch/m68k/include/asm/sun3_pgalloc.h | 4 +- > arch/microblaze/include/asm/pgalloc.h | 2 +- > arch/mips/include/asm/pgalloc.h | 4 +- > arch/nios2/include/asm/pgalloc.h | 4 +- > arch/openrisc/include/asm/pgalloc.h | 8 +- > arch/parisc/include/asm/pgalloc.h | 2 +- > arch/powerpc/include/asm/book3s/32/pgalloc.h | 4 +- > arch/powerpc/include/asm/book3s/64/hash-4k.h | 4 +- > arch/powerpc/include/asm/book3s/64/hash-64k.h | 4 +- > arch/powerpc/include/asm/book3s/64/pgalloc.h | 4 +- > arch/powerpc/include/asm/book3s/64/pgtable.h | 8 +- > arch/powerpc/include/asm/book3s/64/radix.h | 4 +- > arch/powerpc/include/asm/pgalloc.h | 8 +- > arch/powerpc/mm/book3s64/hash_pgtable.c | 10 +- > arch/powerpc/mm/book3s64/radix_pgtable.c | 10 +- > arch/riscv/include/asm/pgalloc.h | 8 +- > arch/s390/include/asm/pgalloc.h | 4 +- > arch/s390/include/asm/pgtable.h | 4 +- > arch/s390/mm/pgalloc.c | 2 +- > arch/s390/mm/pgtable.c | 14 +-- > arch/sh/include/asm/pgalloc.h | 4 +- > arch/sparc/include/asm/pgalloc_32.h | 6 +- > arch/sparc/include/asm/pgalloc_64.h | 2 +- > arch/sparc/include/asm/pgtable_64.h | 4 +- > arch/sparc/mm/init_64.c | 2 +- > arch/sparc/mm/srmmu.c | 6 +- > arch/sparc/mm/tlb.c | 14 +-- > arch/x86/include/asm/pgalloc.h | 10 +- > arch/x86/mm/pgtable.c | 8 +- > arch/xtensa/include/asm/pgalloc.h | 12 +- > fs/dax.c | 14 +-- > include/asm-generic/pgalloc.h | 10 +- > include/linux/mm.h | 16 ++- > include/linux/mm_types.h | 4 +- > include/linux/pgtable.h | 6 +- > mm/debug_vm_pgtable.c | 6 +- > mm/huge_memory.c | 103 +++++++++--------- > mm/internal.h | 2 +- > mm/khugepaged.c | 14 +-- > mm/memory.c | 15 +-- > mm/mremap.c | 2 +- > mm/pgtable-generic.c | 37 +++---- > 53 files changed, 240 insertions(+), 236 deletions(-) >
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