From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) by kanga.kvack.org (Postfix) with ESMTP id F2EE96B6AE2 for ; Mon, 3 Dec 2018 15:18:33 -0500 (EST) Received: by mail-qt1-f199.google.com with SMTP id k90so14711989qte.0 for ; Mon, 03 Dec 2018 12:18:33 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id j25si2954361qtr.152.2018.12.03.12.18.32 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 03 Dec 2018 12:18:33 -0800 (PST) From: jglisse@redhat.com Subject: [PATCH 0/3] mmu notifier contextual informations Date: Mon, 3 Dec 2018 15:18:14 -0500 Message-Id: <20181203201817.10759-1-jglisse@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Matthew Wilcox , Ross Zwisler , Jan Kara , Dan Williams , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Michal Hocko , Christian Koenig , Felix Kuehling , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, dri-devel@lists.freedesktop.org From: Jérôme Glisse This patchset add contextual information, why an invalidation is happening, to mmu notifier callback. This is necessary for user of mmu notifier that wish to maintains their own data structure without having to add new fields to struct vm_area_struct (vma). For instance device can have they own page table that mirror the process address space. When a vma is unmap (munmap() syscall) the device driver can free the device page table for the range. Today we do not have any information on why a mmu notifier call back is happening and thus device driver have to assume that it is always an munmap(). This is inefficient at it means that it needs to re-allocate device page table on next page fault and rebuild the whole device driver data structure for the range. Other use case beside munmap() also exist, for instance it is pointless for device driver to invalidate the device page table when the invalidation is for the soft dirtyness tracking. Or device driver can optimize away mprotect() that change the page table permission access for the range. This patchset enable all this optimizations for device driver. I do not include any of those in this serie but other patchset i am posting will leverage this. >>From code point of view the patchset is pretty simple, the first two patches consolidate all mmu notifier arguments into a struct so that it is easier to add/change arguments. The last patch adds the contextual information (munmap, protection, soft dirty, clear, ...). Cheers, Jérôme Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Jan Kara Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Christian Koenig Cc: Felix Kuehling Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Jérôme Glisse (3): mm/mmu_notifier: use structure for invalidate_range_start/end callback mm/mmu_notifier: use structure for invalidate_range_start/end calls mm/mmu_notifier: contextual information for event triggering invalidation drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 43 ++++----- drivers/gpu/drm/i915/i915_gem_userptr.c | 14 ++- drivers/gpu/drm/radeon/radeon_mn.c | 16 ++-- drivers/infiniband/core/umem_odp.c | 20 ++--- drivers/infiniband/hw/hfi1/mmu_rb.c | 13 ++- drivers/misc/mic/scif/scif_dma.c | 11 +-- drivers/misc/sgi-gru/grutlbpurge.c | 14 ++- drivers/xen/gntdev.c | 12 +-- fs/dax.c | 11 ++- fs/proc/task_mmu.c | 10 ++- include/linux/mm.h | 4 +- include/linux/mmu_notifier.h | 106 +++++++++++++++------- kernel/events/uprobes.c | 13 +-- mm/hmm.c | 23 ++--- mm/huge_memory.c | 58 ++++++------ mm/hugetlb.c | 63 +++++++------ mm/khugepaged.c | 13 +-- mm/ksm.c | 26 +++--- mm/madvise.c | 22 ++--- mm/memory.c | 112 ++++++++++++++---------- mm/migrate.c | 30 ++++--- mm/mmu_notifier.c | 22 +++-- mm/mprotect.c | 17 ++-- mm/mremap.c | 14 +-- mm/oom_kill.c | 20 +++-- mm/rmap.c | 34 ++++--- virt/kvm/kvm_main.c | 14 ++- 27 files changed, 421 insertions(+), 334 deletions(-) -- 2.17.2