From: Will Deacon <will@kernel.org> To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Jan Kara <jack@suse.cz>, Minchan Kim <minchan@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Linus Torvalds <torvalds@linux-foundation.org>, Vinayak Menon <vinmenon@codeaurora.org>, Hugh Dickins <hughd@google.com>, Nick Desaulniers <ndesaulniers@google.com>, kernel-team@android.com Subject: [PATCH v4 0/8] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Date: Wed, 20 Jan 2021 17:36:04 +0000 [thread overview] Message-ID: <20210120173612.20913-1-will@kernel.org> (raw) Hi all, This is version four of the patches I previously posted here: v1: https://lore.kernel.org/r/20201209163950.8494-1-will@kernel.org v2: https://lore.kernel.org/r/20210108171517.5290-1-will@kernel.org v3: https://lore.kernel.org/r/20210114175934.13070-1-will@kernel.org The patches allow architectures to opt-in at runtime for faultaround mappings to be created as 'old' instead of 'young'. Although there have been previous attempts at this, they failed either because the decision was deferred to userspace [1] or because it was done unconditionally and shown to regress benchmarks for particular architectures [2]. The big change since v3 is that the immutable fields of 'struct vm_fault' now live in a 'const' anonymous struct. Although Clang will silently accept modifications to these fields [3], GCC emits an error. The resulting diffstat is _considerably_ more manageable with this approach. As before, I've also updated this branch: https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=faultaround Cheers, Will [1] https://www.spinics.net/lists/linux-mm/msg143831.html [2] 315d09bf30c2 ("Revert "mm: make faultaround produce old ptes"") [3] https://bugs.llvm.org/show_bug.cgi?id=48755 Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jan Kara <jack@suse.cz> Cc: Minchan Kim <minchan@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Vinayak Menon <vinmenon@codeaurora.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Hugh Dickins <hughd@google.com> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: <kernel-team@android.com> --->8 Kirill A. Shutemov (1): mm: Cleanup faultaround and finish_fault() codepaths Will Deacon (7): mm: Allow architectures to request 'old' entries when prefaulting arm64: mm: Implement arch_wants_old_prefaulted_pte() mm: Move immutable fields of 'struct vm_fault' into anonymous struct mm: Pass 'address' to map to do_set_pte() and drop FAULT_FLAG_PREFAULT mm: Avoid modifying vmf.address in __collapse_huge_page_swapin() mm: Use static initialisers for immutable fields of 'struct vm_fault' mm: Mark anonymous struct field of 'struct vm_fault' as 'const' arch/arm64/include/asm/pgtable.h | 12 +- fs/xfs/xfs_file.c | 6 +- include/linux/mm.h | 25 ++-- include/linux/pgtable.h | 11 ++ mm/filemap.c | 178 ++++++++++++++++++------ mm/khugepaged.c | 37 +++-- mm/memory.c | 223 +++++++++++-------------------- mm/shmem.c | 6 +- mm/swapfile.c | 11 +- 9 files changed, 280 insertions(+), 229 deletions(-) -- 2.30.0.284.gd98b1dd5eaa7-goog
WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will@kernel.org> To: linux-kernel@vger.kernel.org Cc: Nick Desaulniers <ndesaulniers@google.com>, kernel-team@android.com, Jan Kara <jack@suse.cz>, Minchan Kim <minchan@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Linus Torvalds <torvalds@linux-foundation.org>, Hugh Dickins <hughd@google.com>, linux-mm@kvack.org, Vinayak Menon <vinmenon@codeaurora.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Andrew Morton <akpm@linux-foundation.org>, Will Deacon <will@kernel.org>, linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 0/8] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Date: Wed, 20 Jan 2021 17:36:04 +0000 [thread overview] Message-ID: <20210120173612.20913-1-will@kernel.org> (raw) Hi all, This is version four of the patches I previously posted here: v1: https://lore.kernel.org/r/20201209163950.8494-1-will@kernel.org v2: https://lore.kernel.org/r/20210108171517.5290-1-will@kernel.org v3: https://lore.kernel.org/r/20210114175934.13070-1-will@kernel.org The patches allow architectures to opt-in at runtime for faultaround mappings to be created as 'old' instead of 'young'. Although there have been previous attempts at this, they failed either because the decision was deferred to userspace [1] or because it was done unconditionally and shown to regress benchmarks for particular architectures [2]. The big change since v3 is that the immutable fields of 'struct vm_fault' now live in a 'const' anonymous struct. Although Clang will silently accept modifications to these fields [3], GCC emits an error. The resulting diffstat is _considerably_ more manageable with this approach. As before, I've also updated this branch: https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=faultaround Cheers, Will [1] https://www.spinics.net/lists/linux-mm/msg143831.html [2] 315d09bf30c2 ("Revert "mm: make faultaround produce old ptes"") [3] https://bugs.llvm.org/show_bug.cgi?id=48755 Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jan Kara <jack@suse.cz> Cc: Minchan Kim <minchan@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Vinayak Menon <vinmenon@codeaurora.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Hugh Dickins <hughd@google.com> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: <kernel-team@android.com> --->8 Kirill A. Shutemov (1): mm: Cleanup faultaround and finish_fault() codepaths Will Deacon (7): mm: Allow architectures to request 'old' entries when prefaulting arm64: mm: Implement arch_wants_old_prefaulted_pte() mm: Move immutable fields of 'struct vm_fault' into anonymous struct mm: Pass 'address' to map to do_set_pte() and drop FAULT_FLAG_PREFAULT mm: Avoid modifying vmf.address in __collapse_huge_page_swapin() mm: Use static initialisers for immutable fields of 'struct vm_fault' mm: Mark anonymous struct field of 'struct vm_fault' as 'const' arch/arm64/include/asm/pgtable.h | 12 +- fs/xfs/xfs_file.c | 6 +- include/linux/mm.h | 25 ++-- include/linux/pgtable.h | 11 ++ mm/filemap.c | 178 ++++++++++++++++++------ mm/khugepaged.c | 37 +++-- mm/memory.c | 223 +++++++++++-------------------- mm/shmem.c | 6 +- mm/swapfile.c | 11 +- 9 files changed, 280 insertions(+), 229 deletions(-) -- 2.30.0.284.gd98b1dd5eaa7-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-01-20 19:01 UTC|newest] Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-20 17:36 Will Deacon [this message] 2021-01-20 17:36 ` [PATCH v4 0/8] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Will Deacon 2021-01-20 17:36 ` [PATCH v4 1/8] mm: Cleanup faultaround and finish_fault() codepaths Will Deacon 2021-01-20 17:36 ` Will Deacon 2021-01-20 17:36 ` [PATCH v4 2/8] mm: Allow architectures to request 'old' entries when prefaulting Will Deacon 2021-01-20 17:36 ` Will Deacon 2021-01-20 17:36 ` [PATCH v4 3/8] arm64: mm: Implement arch_wants_old_prefaulted_pte() Will Deacon 2021-01-20 17:36 ` Will Deacon 2021-01-20 17:36 ` [PATCH v4 4/8] mm: Move immutable fields of 'struct vm_fault' into anonymous struct Will Deacon 2021-01-20 17:36 ` Will Deacon 2021-01-20 18:13 ` Nick Desaulniers 2021-01-20 18:13 ` Nick Desaulniers 2021-01-20 18:13 ` Nick Desaulniers 2021-01-21 12:48 ` Will Deacon 2021-01-21 12:48 ` Will Deacon 2021-01-20 17:36 ` [PATCH v4 5/8] mm: Pass 'address' to map to do_set_pte() and drop FAULT_FLAG_PREFAULT Will Deacon 2021-01-20 17:36 ` Will Deacon 2021-01-20 17:36 ` [PATCH v4 6/8] mm: Avoid modifying vmf.address in __collapse_huge_page_swapin() Will Deacon 2021-01-20 17:36 ` Will Deacon 2021-01-20 17:36 ` [PATCH v4 7/8] mm: Use static initialisers for immutable fields of 'struct vm_fault' Will Deacon 2021-01-20 17:36 ` Will Deacon 2021-01-20 18:21 ` Nick Desaulniers 2021-01-20 18:21 ` Nick Desaulniers 2021-01-20 18:21 ` Nick Desaulniers 2021-01-21 12:50 ` Will Deacon 2021-01-21 12:50 ` Will Deacon 2021-01-20 17:36 ` [PATCH v4 8/8] mm: Mark anonymous struct field of 'struct vm_fault' as 'const' Will Deacon 2021-01-20 17:36 ` Will Deacon 2021-01-20 18:27 ` Nick Desaulniers 2021-01-20 18:27 ` Nick Desaulniers 2021-01-20 18:27 ` Nick Desaulniers 2021-01-20 19:02 ` Linus Torvalds 2021-01-20 19:02 ` Linus Torvalds 2021-01-20 19:02 ` Linus Torvalds 2021-01-21 13:11 ` Will Deacon 2021-01-21 13:11 ` Will Deacon 2021-01-21 19:24 ` Nick Desaulniers 2021-01-21 19:24 ` Nick Desaulniers 2021-01-21 19:24 ` Nick Desaulniers 2021-01-21 21:28 ` Will Deacon 2021-01-21 21:28 ` Will Deacon 2021-01-22 19:10 ` Nick Desaulniers 2021-01-22 19:10 ` Nick Desaulniers 2021-01-22 19:10 ` Nick Desaulniers 2021-01-22 19:27 ` Will Deacon 2021-01-22 19:27 ` Will Deacon 2021-01-22 17:47 ` Linus Torvalds 2021-01-22 17:47 ` Linus Torvalds 2021-01-22 17:47 ` Linus Torvalds 2021-01-26 23:08 ` [PATCH v4 0/8] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Will Deacon 2021-01-26 23:08 ` Will Deacon 2021-01-26 23:28 ` Hugh Dickins 2021-01-26 23:28 ` Hugh Dickins 2021-01-26 23:28 ` Hugh Dickins 2021-01-27 17:16 ` Will Deacon 2021-01-27 17:16 ` Will Deacon
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