From patchwork Wed Apr 15 00:43:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michel Lespinasse X-Patchwork-Id: 11489435 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8914A1392 for ; Wed, 15 Apr 2020 00:43:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3BFA5206D9 for ; Wed, 15 Apr 2020 00:43:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ao9yIhLk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3BFA5206D9 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 455138E0003; Tue, 14 Apr 2020 20:43:58 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 404CC8E0001; Tue, 14 Apr 2020 20:43:58 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2F2D28E0003; Tue, 14 Apr 2020 20:43:58 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0067.hostedemail.com [216.40.44.67]) by kanga.kvack.org (Postfix) with ESMTP id 187238E0001 for ; Tue, 14 Apr 2020 20:43:58 -0400 (EDT) Received: from smtpin11.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id C73788245578 for ; Wed, 15 Apr 2020 00:43:57 +0000 (UTC) X-FDA: 76708242114.11.alley51_3fa5460abe118 X-Spam-Summary: 2,0,0,52d5f87529e62aaa,d41d8cd98f00b204,3zfiwxgykcnejx871a3bb381.zb985ahk-997ixz7.be3@flex--walken.bounces.google.com,,RULES_HIT:4:41:152:355:379:541:967:968:973:988:989:1260:1277:1313:1314:1345:1437:1516:1518:1593:1594:1605:1730:1747:1777:1792:1801:2198:2199:2393:2525:2553:2559:2563:2639:2682:2685:2859:2904:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3152:3865:3866:3867:3868:3870:3871:3872:3874:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4250:4321:4605:5007:6261:6653:6742:7875:7903:7974:8660:8784:9025:9969:10004:11026:11232:11473:11658:11914:12043:12296:12297:12438:12555:12679:12895:12986:13148:13149:13161:13229:13230:13868:14096:14097:14394:14659:21080:21212:21220:21324:21325:21433:21444:21451:21627:21740:21773:21987:30010:30012:30054:30070:30090,0,RBL:209.85.210.202:@flex--walken.bounces.google.com:.lbl8.mailshell.net-62.18.0.100 66.100.201.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp, MSBL:0,D X-HE-Tag: alley51_3fa5460abe118 X-Filterd-Recvd-Size: 16124 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) by imf44.hostedemail.com (Postfix) with ESMTP for ; Wed, 15 Apr 2020 00:43:57 +0000 (UTC) Received: by mail-pf1-f202.google.com with SMTP id w203so1394325pfc.21 for ; Tue, 14 Apr 2020 17:43:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=IRAOmpUvzzA7bc0bIQpN0DCM6X43FqUQgTM1nsdyGUs=; b=ao9yIhLkGUh3Km8WkoKAEeuPTP9tXLALooA+3FGMyxmrZo39dvAZORhYU2+/4xjBHm HXr1QAsGlxkVtNy/yda3SMwFGmFtlLQE1M76h/V1Mxr4a2u7FNwxkutkUhe0oJl5oFhK uz3X4bZ01znYIpGQK3miKw2xvFxbAfs+Mh5Y0uIFSADWMrukxgkVSdyxtyAuBubJ+hwH t+VUsNb2Osy8XQqBOFqmtvjpZWID4pMKl47Kt64dJif0tBVLsKeY/jZ+p7FGZDxNUN23 mMszxsGpJV04HqIpr5xvQpgXqP94Pb6liaRWGo1Dc18RyBH+QC2+AciY2jPrrYfEmRZT cwzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=IRAOmpUvzzA7bc0bIQpN0DCM6X43FqUQgTM1nsdyGUs=; b=Z25js6BKXpvIpicPvmciBNVZBwlqhyU1J3x8bj8x8Kb1NLDDxVF0t1Jgp+Y9HxAfIk +XXzvaTLwpBET/X8tT9caCO9Bo6KVyQgyxB2SMpOQtl2GhHOTLtzTFkAFAc9lJZbVqiL UTSKFHeS92Ew5zVttmdoI79ek/OQRmNGWh6HnfDDKEkF/U3Cb/gN3EQugTNELL0V6sIX PKfBPuQ9Op+t8cNZt9s7nP6hd4HqU5GNuR3DBLiOrnPlXWhUOHXSkFNykHVL7kvjJDSr lKaaaDzw/WbhqhCZBKOMKRq9bUemFLbdoOhY6Q3UbFwLDkq2FqBe6jLms7S3nh4lJYDx aRdw== X-Gm-Message-State: AGi0PuYocCLZdqT2PLM77RrqwE4SP2oDQUxCnLpwgEO1sxr6FaPaLX+c 177AA63MbZ+ykzC46l55mZ8mwKvs0Qk= X-Google-Smtp-Source: APiQypLUf0YYJmX+6MU7adXctu9WVXNaqyx42QHiYP/IVgCtWwLPW4WGLedobnCR22xziDhUSzok+bJ4JOE= X-Received: by 2002:a17:90a:e515:: with SMTP id t21mr3016913pjy.123.1586911436045; Tue, 14 Apr 2020 17:43:56 -0700 (PDT) Date: Tue, 14 Apr 2020 17:43:43 -0700 Message-Id: <20200415004353.130248-1-walken@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.26.0.110.g2183baf09c-goog Subject: [PATCH v4 00/10] Add a new mmap locking API wrapping mmap_sem calls From: Michel Lespinasse To: Andrew Morton , linux-mm Cc: LKML , Peter Zijlstra , Laurent Dufour , Vlastimil Babka , Matthew Wilcox , Liam Howlett , Jerome Glisse , Davidlohr Bueso , David Rientjes , Hugh Dickins , Ying Han , Jason Gunthorpe , Daniel Jordan , Michel Lespinasse X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Reposting this patch series on top of v5.7-rc1. I think this would be a good time for the series to be picked up in -mm tree for integration into v5.8. I also made minor changes to patches 6 and 7 based on reviewer feedback on the previous revisions. This patch series adds a new mmap locking API replacing the existing mmap_sem lock and unlocks. Initially the API is just implemente in terms of inlined rwsem calls, so it doesn't provide any new functionality. There are two justifications for the new API: - At first, it provides an easy hooking point to instrument mmap_sem locking latencies independently of any other rwsems. - In the future, it may be a starting point for replacing the rwsem implementation with a different one, such as range locks. This is something that is being explored, even though there is no wide concensus about this possible direction yet. (see https://patchwork.kernel.org/cover/11401483/) Changes since v3 of the patchset: - The changes now apply on top of v5.7-rc1. This was a straight rebase except for changes noted here. - Re-generated the coccinelle changes (patch 04/10). - Patch 06/10: removed the mmap_write_unlock_nested API; mmap_write_lock_nested() calls now pair with the regular mmap_write_unlock() as was suggested by many people. - Patch 07/10: removed the mmap_read_release API; this is replaced with mmap_read_trylock_non_owner() which pairs with mmap_read_unlock_non_owner() Thanks to Peter Zijlstra for the suggestion. Changes since v2 of the patchset: - Removed the mmap_is_locked API - v2 had removed all uses of it, but the actual function definition was still there unused. Thanks to Jason Gunthorpe for noticing the unused mmap_is_locked function. Changes since v1 of the patchset: - Manually convert drivers/dma-buf/dma-resv.c ahead of the automated coccinelle conversion as this file requires a new include statement. Thanks to Intel's kbuild test bot for finding the issue. - In coccinelle automated conversion, apply a single coccinelle rule as suggested by Markus Elfring. - In manual conversion of sites missed by coccinelle, fix an issue where I had used mm_read_unlock (from an older version of my patchset) instead of mmap_read_unlock in some arch/mips code. This was also identified by Intel's kbuild test bot. - Do not add a new mmap_is_locked API, and use lockdep_assert_held instead. Thanks to Jason Gunthorpe and Matthew Wilcox for the suggestion. The changes apply on top of v5.7-rc1. I think these changes are ready for integration into the -mm tree now (for integration into v5.8). The coccinelle part of the change is relatively invasive, but can be skipped over on a file by file basis if it causes any conflicts with other pending changes. The new mmap locking API can interoperate with new code that is still using direct rwsem calls, until the last patch in the series which renames mmap_sem to enforce using the new API. Maybe that last patch could be delayed for a bit, so that we'd get a chance to convert any new code that locks mmap_sem in the -rc1 release before applying that last patch. Michel Lespinasse (10): mmap locking API: initial implementation as rwsem wrappers MMU notifier: use the new mmap locking API DMA reservations: use the new mmap locking API mmap locking API: use coccinelle to convert mmap_sem rwsem call sites mmap locking API: convert mmap_sem call sites missed by coccinelle mmap locking API: convert nested write lock sites mmap locking API: add mmap_read_trylock_non_owner() mmap locking API: add MMAP_LOCK_INITIALIZER mmap locking API: use lockdep_assert_held mmap locking API: rename mmap_sem to mmap_lock arch/alpha/kernel/traps.c | 4 +- arch/alpha/mm/fault.c | 10 +-- arch/arc/kernel/process.c | 4 +- arch/arc/kernel/troubleshoot.c | 4 +- arch/arc/mm/fault.c | 4 +- arch/arm/kernel/process.c | 4 +- arch/arm/kernel/swp_emulate.c | 4 +- arch/arm/lib/uaccess_with_memcpy.c | 16 ++-- arch/arm/mm/fault.c | 6 +- arch/arm64/kernel/traps.c | 4 +- arch/arm64/kernel/vdso.c | 8 +- arch/arm64/mm/fault.c | 8 +- arch/csky/kernel/vdso.c | 4 +- arch/csky/mm/fault.c | 8 +- arch/hexagon/kernel/vdso.c | 4 +- arch/hexagon/mm/vm_fault.c | 8 +- arch/ia64/kernel/perfmon.c | 8 +- arch/ia64/mm/fault.c | 12 +-- arch/ia64/mm/init.c | 12 +-- arch/m68k/kernel/sys_m68k.c | 14 ++-- arch/m68k/mm/fault.c | 8 +- arch/microblaze/mm/fault.c | 12 +-- arch/mips/kernel/traps.c | 4 +- arch/mips/kernel/vdso.c | 4 +- arch/mips/mm/fault.c | 10 +-- arch/nds32/kernel/vdso.c | 6 +- arch/nds32/mm/fault.c | 12 +-- arch/nios2/mm/fault.c | 12 +-- arch/nios2/mm/init.c | 4 +- arch/openrisc/mm/fault.c | 10 +-- arch/parisc/kernel/traps.c | 6 +- arch/parisc/mm/fault.c | 8 +- arch/powerpc/kernel/vdso.c | 6 +- arch/powerpc/kvm/book3s_hv.c | 6 +- arch/powerpc/kvm/book3s_hv_uvmem.c | 12 +-- arch/powerpc/kvm/e500_mmu_host.c | 4 +- arch/powerpc/mm/book3s64/iommu_api.c | 4 +- arch/powerpc/mm/book3s64/subpage_prot.c | 12 +-- arch/powerpc/mm/copro_fault.c | 4 +- arch/powerpc/mm/fault.c | 12 +-- arch/powerpc/oprofile/cell/spu_task_sync.c | 6 +- arch/powerpc/platforms/cell/spufs/file.c | 4 +- arch/riscv/kernel/vdso.c | 4 +- arch/riscv/mm/fault.c | 10 +-- arch/s390/kernel/uv.c | 4 +- arch/s390/kernel/vdso.c | 4 +- arch/s390/kvm/gaccess.c | 4 +- arch/s390/kvm/interrupt.c | 4 +- arch/s390/kvm/kvm-s390.c | 28 +++---- arch/s390/kvm/priv.c | 32 ++++---- arch/s390/mm/fault.c | 14 ++-- arch/s390/mm/gmap.c | 44 +++++------ arch/s390/pci/pci_mmio.c | 4 +- arch/sh/kernel/sys_sh.c | 6 +- arch/sh/kernel/vsyscall/vsyscall.c | 4 +- arch/sh/mm/fault.c | 10 +-- arch/sparc/mm/fault_32.c | 18 ++--- arch/sparc/mm/fault_64.c | 12 +-- arch/sparc/vdso/vma.c | 4 +- arch/um/include/asm/mmu_context.h | 5 +- arch/um/kernel/tlb.c | 2 +- arch/um/kernel/trap.c | 6 +- arch/unicore32/mm/fault.c | 6 +- arch/x86/entry/vdso/vma.c | 14 ++-- arch/x86/events/core.c | 4 +- arch/x86/kernel/tboot.c | 2 +- arch/x86/kernel/vm86_32.c | 4 +- arch/x86/kvm/mmu/paging_tmpl.h | 8 +- arch/x86/mm/fault.c | 10 +-- arch/x86/um/vdso/vma.c | 4 +- arch/xtensa/mm/fault.c | 10 +-- drivers/android/binder_alloc.c | 10 +-- drivers/dma-buf/dma-resv.c | 5 +- drivers/firmware/efi/efi.c | 2 +- .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 4 +- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 10 +-- drivers/gpu/drm/amd/amdkfd/kfd_events.c | 4 +- drivers/gpu/drm/etnaviv/etnaviv_gem.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_mman.c | 4 +- drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 8 +- drivers/gpu/drm/nouveau/nouveau_svm.c | 22 +++--- drivers/gpu/drm/radeon/radeon_cs.c | 4 +- drivers/gpu/drm/radeon/radeon_gem.c | 6 +- drivers/gpu/drm/ttm/ttm_bo_vm.c | 4 +- drivers/infiniband/core/umem_odp.c | 4 +- drivers/infiniband/core/uverbs_main.c | 4 +- drivers/infiniband/hw/mlx4/mr.c | 4 +- drivers/infiniband/hw/qib/qib_user_pages.c | 6 +- drivers/infiniband/hw/usnic/usnic_uiom.c | 4 +- drivers/infiniband/sw/siw/siw_mem.c | 4 +- drivers/iommu/amd_iommu_v2.c | 4 +- drivers/iommu/intel-svm.c | 4 +- drivers/media/v4l2-core/videobuf-core.c | 4 +- drivers/media/v4l2-core/videobuf-dma-contig.c | 4 +- drivers/media/v4l2-core/videobuf-dma-sg.c | 4 +- drivers/misc/cxl/cxllib.c | 4 +- drivers/misc/cxl/fault.c | 4 +- drivers/misc/sgi-gru/grufault.c | 16 ++-- drivers/misc/sgi-gru/grufile.c | 4 +- drivers/oprofile/buffer_sync.c | 10 +-- drivers/staging/kpc2000/kpc_dma/fileops.c | 4 +- drivers/tee/optee/call.c | 4 +- drivers/vfio/vfio_iommu_type1.c | 8 +- drivers/vhost/vdpa.c | 4 +- drivers/xen/gntdev.c | 4 +- drivers/xen/privcmd.c | 14 ++-- fs/aio.c | 4 +- fs/coredump.c | 4 +- fs/exec.c | 16 ++-- fs/io_uring.c | 4 +- fs/proc/base.c | 18 ++--- fs/proc/task_mmu.c | 28 +++---- fs/proc/task_nommu.c | 18 ++--- fs/userfaultfd.c | 26 +++---- include/linux/mm.h | 1 + include/linux/mm_types.h | 2 +- include/linux/mmap_lock.h | 75 +++++++++++++++++++ include/linux/mmu_notifier.h | 5 +- ipc/shm.c | 8 +- kernel/acct.c | 4 +- kernel/bpf/stackmap.c | 17 ++--- kernel/events/core.c | 4 +- kernel/events/uprobes.c | 16 ++-- kernel/exit.c | 8 +- kernel/fork.c | 14 ++-- kernel/futex.c | 4 +- kernel/sched/fair.c | 4 +- kernel/sys.c | 18 ++--- kernel/trace/trace_output.c | 4 +- lib/test_lockup.c | 8 +- mm/filemap.c | 6 +- mm/frame_vector.c | 4 +- mm/gup.c | 20 ++--- mm/hmm.c | 2 +- mm/init-mm.c | 2 +- mm/internal.h | 2 +- mm/khugepaged.c | 36 ++++----- mm/ksm.c | 34 ++++----- mm/madvise.c | 18 ++--- mm/memcontrol.c | 8 +- mm/memory.c | 16 ++-- mm/mempolicy.c | 22 +++--- mm/migrate.c | 8 +- mm/mincore.c | 4 +- mm/mlock.c | 16 ++-- mm/mmap.c | 36 ++++----- mm/mmu_notifier.c | 22 +++--- mm/mprotect.c | 12 +-- mm/mremap.c | 6 +- mm/msync.c | 8 +- mm/nommu.c | 16 ++-- mm/oom_kill.c | 4 +- mm/pagewalk.c | 15 ++-- mm/process_vm_access.c | 4 +- mm/ptdump.c | 4 +- mm/swapfile.c | 4 +- mm/userfaultfd.c | 18 ++--- mm/util.c | 12 +-- net/ipv4/tcp.c | 4 +- net/xdp/xdp_umem.c | 4 +- virt/kvm/arm/mmu.c | 14 ++-- virt/kvm/async_pf.c | 4 +- virt/kvm/kvm_main.c | 8 +- 163 files changed, 788 insertions(+), 715 deletions(-) create mode 100644 include/linux/mmap_lock.h