From patchwork Wed Jan 23 22:23:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10777967 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AD4061390 for ; Wed, 23 Jan 2019 22:23:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A3402D368 for ; Wed, 23 Jan 2019 22:23:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8E6172D3BE; Wed, 23 Jan 2019 22:23:35 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 10FD12D368 for ; Wed, 23 Jan 2019 22:23:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727074AbfAWWXd (ORCPT ); Wed, 23 Jan 2019 17:23:33 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57834 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726249AbfAWWXc (ORCPT ); Wed, 23 Jan 2019 17:23:32 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 20E67461FF; Wed, 23 Jan 2019 22:23:32 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7FF865D964; Wed, 23 Jan 2019 22:23:29 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 1/9] mm/mmu_notifier: contextual information for event enums Date: Wed, 23 Jan 2019 17:23:07 -0500 Message-Id: <20190123222315.1122-2-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 23 Jan 2019 22:23:32 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse CPU page table update can happens for many reasons, not only as a result of a syscall (munmap(), mprotect(), mremap(), madvise(), ...) but also as a result of kernel activities (memory compression, reclaim, migration, ...). This patch introduce a set of enums that can be associated with each of the events triggering a mmu notifier. Latter patches take advantages of those enum values. - UNMAP: munmap() or mremap() - CLEAR: page table is cleared (migration, compaction, reclaim, ...) - PROTECTION_VMA: change in access protections for the range - PROTECTION_PAGE: change in access protections for page in the range - SOFT_DIRTY: soft dirtyness tracking Being able to identify munmap() and mremap() from other reasons why the page table is cleared is important to allow user of mmu notifier to update their own internal tracking structure accordingly (on munmap or mremap it is not longer needed to track range of virtual address as it becomes invalid). Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- include/linux/mmu_notifier.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 4050ec1c3b45..abc9dbb7bcb6 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -10,6 +10,36 @@ struct mmu_notifier; struct mmu_notifier_ops; +/** + * enum mmu_notifier_event - reason for the mmu notifier callback + * @MMU_NOTIFY_UNMAP: either munmap() that unmap the range or a mremap() that + * move the range + * + * @MMU_NOTIFY_CLEAR: clear page table entry (many reasons for this like + * madvise() or replacing a page by another one, ...). + * + * @MMU_NOTIFY_PROTECTION_VMA: update is due to protection change for the range + * ie using the vma access permission (vm_page_prot) to update the whole range + * is enough no need to inspect changes to the CPU page table (mprotect() + * syscall) + * + * @MMU_NOTIFY_PROTECTION_PAGE: update is due to change in read/write flag for + * pages in the range so to mirror those changes the user must inspect the CPU + * page table (from the end callback). + * + * @MMU_NOTIFY_SOFT_DIRTY: soft dirty accounting (still same page and same + * access flags). User should soft dirty the page in the end callback to make + * sure that anyone relying on soft dirtyness catch pages that might be written + * through non CPU mappings. + */ +enum mmu_notifier_event { + MMU_NOTIFY_UNMAP = 0, + MMU_NOTIFY_CLEAR, + MMU_NOTIFY_PROTECTION_VMA, + MMU_NOTIFY_PROTECTION_PAGE, + MMU_NOTIFY_SOFT_DIRTY, +}; + #ifdef CONFIG_MMU_NOTIFIER /* From patchwork Wed Jan 23 22:23:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10777975 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E000A1399 for ; Wed, 23 Jan 2019 22:23:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CD9412D368 for ; Wed, 23 Jan 2019 22:23:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BF46A2D3D7; Wed, 23 Jan 2019 22:23:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 845982D368 for ; Wed, 23 Jan 2019 22:23:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727128AbfAWWXg (ORCPT ); Wed, 23 Jan 2019 17:23:36 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54388 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727101AbfAWWXf (ORCPT ); Wed, 23 Jan 2019 17:23:35 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 19010A7880; Wed, 23 Jan 2019 22:23:35 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4DD495D965; Wed, 23 Jan 2019 22:23:32 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 2/9] mm/mmu_notifier: contextual information for event triggering invalidation Date: Wed, 23 Jan 2019 17:23:08 -0500 Message-Id: <20190123222315.1122-3-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 23 Jan 2019 22:23:35 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse CPU page table update can happens for many reasons, not only as a result of a syscall (munmap(), mprotect(), mremap(), madvise(), ...) but also as a result of kernel activities (memory compression, reclaim, migration, ...). Users of mmu notifier API track changes to the CPU page table and take specific action for them. While current API only provide range of virtual address affected by the change, not why the changes is happening. This patchset do the initial mechanical convertion of all the places that calls mmu_notifier_range_init to also provide the default MMU_NOTIFY_UNMAP event as well as the vma if it is know (most invalidation happens against a given vma). Passing down the vma allows the users of mmu notifier to inspect the new vma page protection. The MMU_NOTIFY_UNMAP is always the safe default as users of mmu notifier should assume that every for the range is going away when that event happens. A latter patch do convert mm call path to use a more appropriate events for each call. This is done as 2 patches so that no call site is forgotten especialy as it uses this following coccinelle patch: %<---------------------------------------------------------------------- @@ identifier I1, I2, I3, I4; @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *I1, +enum mmu_notifier_event event, +struct vm_area_struct *vma, struct mm_struct *I2, unsigned long I3, unsigned long I4) { ... } @@ @@ -#define mmu_notifier_range_init(range, mm, start, end) +#define mmu_notifier_range_init(range, event, vma, mm, start, end) @@ expression E1, E3, E4; identifier I1; @@ <... mmu_notifier_range_init(E1, +MMU_NOTIFY_UNMAP, I1, I1->vm_mm, E3, E4) ...> @@ expression E1, E2, E3, E4; identifier FN, VMA; @@ FN(..., struct vm_area_struct *VMA, ...) { <... mmu_notifier_range_init(E1, +MMU_NOTIFY_UNMAP, VMA, E2, E3, E4) ...> } @@ expression E1, E2, E3, E4; identifier FN, VMA; @@ FN(...) { struct vm_area_struct *VMA; <... mmu_notifier_range_init(E1, +MMU_NOTIFY_UNMAP, VMA, E2, E3, E4) ...> } @@ expression E1, E2, E3, E4; identifier FN; @@ FN(...) { <... mmu_notifier_range_init(E1, +MMU_NOTIFY_UNMAP, NULL, E2, E3, E4) ...> } ---------------------------------------------------------------------->% Applied with: spatch --all-includes --sp-file mmu-notifier.spatch fs/proc/task_mmu.c --in-place spatch --sp-file mmu-notifier.spatch --dir kernel/events/ --in-place spatch --sp-file mmu-notifier.spatch --dir mm --in-place Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- fs/proc/task_mmu.c | 3 ++- include/linux/mmu_notifier.h | 4 +++- kernel/events/uprobes.c | 3 ++- mm/huge_memory.c | 12 ++++++++---- mm/hugetlb.c | 10 ++++++---- mm/khugepaged.c | 3 ++- mm/ksm.c | 6 ++++-- mm/madvise.c | 3 ++- mm/memory.c | 25 ++++++++++++++++--------- mm/migrate.c | 5 ++++- mm/mprotect.c | 3 ++- mm/mremap.c | 3 ++- mm/oom_kill.c | 3 ++- mm/rmap.c | 6 ++++-- 14 files changed, 59 insertions(+), 30 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index f0ec9edab2f3..57e7f98647d3 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1143,7 +1143,8 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, break; } - mmu_notifier_range_init(&range, mm, 0, -1UL); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, + NULL, mm, 0, -1UL); mmu_notifier_invalidate_range_start(&range); } walk_page_range(0, mm->highest_vm_end, &clear_refs_walk); diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index abc9dbb7bcb6..a9808add4070 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -348,6 +348,8 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) static inline void mmu_notifier_range_init(struct mmu_notifier_range *range, + enum mmu_notifier_event event, + struct vm_area_struct *vma, struct mm_struct *mm, unsigned long start, unsigned long end) @@ -482,7 +484,7 @@ static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range, range->end = end; } -#define mmu_notifier_range_init(range, mm, start, end) \ +#define mmu_notifier_range_init(range,event,vma,mm,start,end) \ _mmu_notifier_range_init(range, start, end) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 8aef47ee7bfa..b67fe7e59621 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -174,7 +174,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, struct mmu_notifier_range range; struct mem_cgroup *memcg; - mmu_notifier_range_init(&range, mm, addr, addr + PAGE_SIZE); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, addr, + addr + PAGE_SIZE); VM_BUG_ON_PAGE(PageTransHuge(old_page), old_page); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index faf357eaf0ce..b353e8b7876f 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1182,7 +1182,8 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf, cond_resched(); } - mmu_notifier_range_init(&range, vma->vm_mm, haddr, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + haddr, haddr + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); @@ -1345,7 +1346,8 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd) vma, HPAGE_PMD_NR); __SetPageUptodate(new_page); - mmu_notifier_range_init(&range, vma->vm_mm, haddr, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + haddr, haddr + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); @@ -2023,7 +2025,8 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, spinlock_t *ptl; struct mmu_notifier_range range; - mmu_notifier_range_init(&range, vma->vm_mm, address & HPAGE_PUD_MASK, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + address & HPAGE_PUD_MASK, (address & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE); mmu_notifier_invalidate_range_start(&range); ptl = pud_lock(vma->vm_mm, pud); @@ -2241,7 +2244,8 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, spinlock_t *ptl; struct mmu_notifier_range range; - mmu_notifier_range_init(&range, vma->vm_mm, address & HPAGE_PMD_MASK, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + address & HPAGE_PMD_MASK, (address & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); ptl = pmd_lock(vma->vm_mm, pmd); diff --git a/mm/hugetlb.c b/mm/hugetlb.c index df2e7dd5ff17..cbda46ad6a30 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3246,7 +3246,8 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; if (cow) { - mmu_notifier_range_init(&range, src, vma->vm_start, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, src, + vma->vm_start, vma->vm_end); mmu_notifier_invalidate_range_start(&range); } @@ -3358,7 +3359,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, /* * If sharing possible, alert mmu notifiers of worst case. */ - mmu_notifier_range_init(&range, mm, start, end); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, start, end); adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end); mmu_notifier_invalidate_range_start(&range); address = start; @@ -3626,7 +3627,8 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, __SetPageUptodate(new_page); set_page_huge_active(new_page); - mmu_notifier_range_init(&range, mm, haddr, haddr + huge_page_size(h)); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, haddr, + haddr + huge_page_size(h)); mmu_notifier_invalidate_range_start(&range); /* @@ -4346,7 +4348,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, * start/end. Set range.start/range.end to cover the maximum possible * range if PMD sharing is possible. */ - mmu_notifier_range_init(&range, mm, start, end); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, start, end); adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end); BUG_ON(address >= end); diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 4f017339ddb2..f903acb1b0a6 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1016,7 +1016,8 @@ static void collapse_huge_page(struct mm_struct *mm, pte = pte_offset_map(pmd, address); pte_ptl = pte_lockptr(mm, pmd); - mmu_notifier_range_init(&range, mm, address, address + HPAGE_PMD_SIZE); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, NULL, mm, address, + address + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); pmd_ptl = pmd_lock(mm, pmd); /* probably unnecessary */ /* diff --git a/mm/ksm.c b/mm/ksm.c index 6c48ad13b4c9..6b27c4f0fb1f 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1051,7 +1051,8 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, BUG_ON(PageTransCompound(page)); - mmu_notifier_range_init(&range, mm, pvmw.address, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, + pvmw.address, pvmw.address + PAGE_SIZE); mmu_notifier_invalidate_range_start(&range); @@ -1139,7 +1140,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, if (!pmd) goto out; - mmu_notifier_range_init(&range, mm, addr, addr + PAGE_SIZE); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, addr, + addr + PAGE_SIZE); mmu_notifier_invalidate_range_start(&range); ptep = pte_offset_map_lock(mm, pmd, addr, &ptl); diff --git a/mm/madvise.c b/mm/madvise.c index 21a7881a2db4..04446dabba56 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -472,7 +472,8 @@ static int madvise_free_single_vma(struct vm_area_struct *vma, range.end = min(vma->vm_end, end_addr); if (range.end <= vma->vm_start) return -EINVAL; - mmu_notifier_range_init(&range, mm, range.start, range.end); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, + range.start, range.end); lru_add_drain(); tlb_gather_mmu(&tlb, mm, range.start, range.end); diff --git a/mm/memory.c b/mm/memory.c index e11ca9dd823f..d9b7c935e812 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1009,7 +1009,8 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, is_cow = is_cow_mapping(vma->vm_flags); if (is_cow) { - mmu_notifier_range_init(&range, src_mm, addr, end); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, src_mm, + addr, end); mmu_notifier_invalidate_range_start(&range); } @@ -1333,7 +1334,8 @@ void unmap_vmas(struct mmu_gather *tlb, { struct mmu_notifier_range range; - mmu_notifier_range_init(&range, vma->vm_mm, start_addr, end_addr); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + start_addr, end_addr); mmu_notifier_invalidate_range_start(&range); for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next) unmap_single_vma(tlb, vma, start_addr, end_addr, NULL); @@ -1355,7 +1357,8 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start, struct mmu_gather tlb; lru_add_drain(); - mmu_notifier_range_init(&range, vma->vm_mm, start, start + size); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + start, start + size); tlb_gather_mmu(&tlb, vma->vm_mm, start, range.end); update_hiwater_rss(vma->vm_mm); mmu_notifier_invalidate_range_start(&range); @@ -1381,7 +1384,8 @@ static void zap_page_range_single(struct vm_area_struct *vma, unsigned long addr struct mmu_gather tlb; lru_add_drain(); - mmu_notifier_range_init(&range, vma->vm_mm, address, address + size); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + address, address + size); tlb_gather_mmu(&tlb, vma->vm_mm, address, range.end); update_hiwater_rss(vma->vm_mm); mmu_notifier_invalidate_range_start(&range); @@ -2271,7 +2275,8 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) __SetPageUptodate(new_page); - mmu_notifier_range_init(&range, mm, vmf->address & PAGE_MASK, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, + vmf->address & PAGE_MASK, (vmf->address & PAGE_MASK) + PAGE_SIZE); mmu_notifier_invalidate_range_start(&range); @@ -4081,8 +4086,9 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address, goto out; if (range) { - mmu_notifier_range_init(range, mm, address & PMD_MASK, - (address & PMD_MASK) + PMD_SIZE); + mmu_notifier_range_init(range, MMU_NOTIFY_UNMAP, NULL, + mm, address & PMD_MASK, + (address & PMD_MASK) + PMD_SIZE); mmu_notifier_invalidate_range_start(range); } *ptlp = pmd_lock(mm, pmd); @@ -4099,8 +4105,9 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address, goto out; if (range) { - mmu_notifier_range_init(range, mm, address & PAGE_MASK, - (address & PAGE_MASK) + PAGE_SIZE); + mmu_notifier_range_init(range, MMU_NOTIFY_UNMAP, NULL, mm, + address & PAGE_MASK, + (address & PAGE_MASK) + PAGE_SIZE); mmu_notifier_invalidate_range_start(range); } ptep = pte_offset_map_lock(mm, pmd, address, ptlp); diff --git a/mm/migrate.c b/mm/migrate.c index a16b15090df3..385c59d5c28d 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2342,7 +2342,8 @@ static void migrate_vma_collect(struct migrate_vma *migrate) mm_walk.mm = migrate->vma->vm_mm; mm_walk.private = migrate; - mmu_notifier_range_init(&range, mm_walk.mm, migrate->start, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, NULL, mm_walk.mm, + migrate->start, migrate->end); mmu_notifier_invalidate_range_start(&range); walk_page_range(migrate->start, migrate->end, &mm_walk); @@ -2750,6 +2751,8 @@ static void migrate_vma_pages(struct migrate_vma *migrate) notified = true; mmu_notifier_range_init(&range, + MMU_NOTIFY_UNMAP, + NULL, migrate->vma->vm_mm, addr, migrate->end); mmu_notifier_invalidate_range_start(&range); diff --git a/mm/mprotect.c b/mm/mprotect.c index 36cb358db170..b22e660701f1 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -185,7 +185,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma, /* invoke the mmu notifier if the pmd is populated */ if (!range.start) { - mmu_notifier_range_init(&range, vma->vm_mm, addr, end); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, + vma->vm_mm, addr, end); mmu_notifier_invalidate_range_start(&range); } diff --git a/mm/mremap.c b/mm/mremap.c index 3320616ed93f..cac19c1e0af4 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -249,7 +249,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma, old_end = old_addr + len; flush_cache_range(vma, old_addr, old_end); - mmu_notifier_range_init(&range, vma->vm_mm, old_addr, old_end); + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + old_addr, old_end); mmu_notifier_invalidate_range_start(&range); for (; old_addr < old_end; old_addr += extent, new_addr += extent) { diff --git a/mm/oom_kill.c b/mm/oom_kill.c index f0e8cd9edb1a..77289bc6a943 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -531,7 +531,8 @@ bool __oom_reap_task_mm(struct mm_struct *mm) struct mmu_notifier_range range; struct mmu_gather tlb; - mmu_notifier_range_init(&range, mm, vma->vm_start, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, + mm, vma->vm_start, vma->vm_end); tlb_gather_mmu(&tlb, mm, range.start, range.end); if (mmu_notifier_invalidate_range_start_nonblock(&range)) { diff --git a/mm/rmap.c b/mm/rmap.c index 0454ecc29537..49c75f0c6c33 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -896,7 +896,8 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma, * We have to assume the worse case ie pmd for invalidation. Note that * the page can not be free from this function. */ - mmu_notifier_range_init(&range, vma->vm_mm, address, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + address, min(vma->vm_end, address + (PAGE_SIZE << compound_order(page)))); mmu_notifier_invalidate_range_start(&range); @@ -1371,7 +1372,8 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma, * Note that the page can not be free in this function as call of * try_to_unmap() must hold a reference on the page. */ - mmu_notifier_range_init(&range, vma->vm_mm, address, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + address, min(vma->vm_end, address + (PAGE_SIZE << compound_order(page)))); if (PageHuge(page)) { From patchwork Wed Jan 23 22:23:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10777979 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 75C5B1390 for ; Wed, 23 Jan 2019 22:23:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 664F52D368 for ; Wed, 23 Jan 2019 22:23:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 599132D396; Wed, 23 Jan 2019 22:23:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 54F752D37E for ; Wed, 23 Jan 2019 22:23:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727175AbfAWWXj (ORCPT ); Wed, 23 Jan 2019 17:23:39 -0500 Received: from mx1.redhat.com ([209.132.183.28]:56286 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727142AbfAWWXi (ORCPT ); Wed, 23 Jan 2019 17:23:38 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E81CFC0A1AE9; Wed, 23 Jan 2019 22:23:37 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 47C655D964; Wed, 23 Jan 2019 22:23:35 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 3/9] mm/mmu_notifier: use correct mmu_notifier events for each invalidation Date: Wed, 23 Jan 2019 17:23:09 -0500 Message-Id: <20190123222315.1122-4-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Wed, 23 Jan 2019 22:23:38 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse This update each existing invalidation to use the correct mmu notifier event that represent what is happening to the CPU page table. See the patch which introduced the events to see the rational behind this. Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- fs/proc/task_mmu.c | 2 +- kernel/events/uprobes.c | 2 +- mm/huge_memory.c | 14 ++++++-------- mm/hugetlb.c | 7 ++++--- mm/khugepaged.c | 2 +- mm/ksm.c | 4 ++-- mm/madvise.c | 2 +- mm/memory.c | 16 ++++++++-------- mm/migrate.c | 4 ++-- mm/mprotect.c | 5 +++-- mm/rmap.c | 6 +++--- 11 files changed, 32 insertions(+), 32 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 57e7f98647d3..cce226f3305f 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1143,7 +1143,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, break; } - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, + mmu_notifier_range_init(&range, MMU_NOTIFY_SOFT_DIRTY, NULL, mm, 0, -1UL); mmu_notifier_invalidate_range_start(&range); } diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index b67fe7e59621..87e76a1dc758 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -174,7 +174,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, struct mmu_notifier_range range; struct mem_cgroup *memcg; - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, addr, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, mm, addr, addr + PAGE_SIZE); VM_BUG_ON_PAGE(PageTransHuge(old_page), old_page); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index b353e8b7876f..957d23754217 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1182,9 +1182,8 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf, cond_resched(); } - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, - haddr, - haddr + HPAGE_PMD_SIZE); + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, vma->vm_mm, + haddr, haddr + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); @@ -1346,9 +1345,8 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd) vma, HPAGE_PMD_NR); __SetPageUptodate(new_page); - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, - haddr, - haddr + HPAGE_PMD_SIZE); + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, vma->vm_mm, + haddr, haddr + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); spin_lock(vmf->ptl); @@ -2025,7 +2023,7 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, spinlock_t *ptl; struct mmu_notifier_range range; - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, vma->vm_mm, address & HPAGE_PUD_MASK, (address & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE); mmu_notifier_invalidate_range_start(&range); @@ -2244,7 +2242,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, spinlock_t *ptl; struct mmu_notifier_range range; - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, vma->vm_mm, address & HPAGE_PMD_MASK, (address & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); diff --git a/mm/hugetlb.c b/mm/hugetlb.c index cbda46ad6a30..f691398ac6b6 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3246,7 +3246,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; if (cow) { - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, src, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, src, vma->vm_start, vma->vm_end); mmu_notifier_invalidate_range_start(&range); @@ -3627,7 +3627,7 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, __SetPageUptodate(new_page); set_page_huge_active(new_page); - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, haddr, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, mm, haddr, haddr + huge_page_size(h)); mmu_notifier_invalidate_range_start(&range); @@ -4348,7 +4348,8 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, * start/end. Set range.start/range.end to cover the maximum possible * range if PMD sharing is possible. */ - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, start, end); + mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_VMA, + vma, mm, start, end); adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end); BUG_ON(address >= end); diff --git a/mm/khugepaged.c b/mm/khugepaged.c index f903acb1b0a6..d09d71f10f0f 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1016,7 +1016,7 @@ static void collapse_huge_page(struct mm_struct *mm, pte = pte_offset_map(pmd, address); pte_ptl = pte_lockptr(mm, pmd); - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, NULL, mm, address, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, NULL, mm, address, address + HPAGE_PMD_SIZE); mmu_notifier_invalidate_range_start(&range); pmd_ptl = pmd_lock(mm, pmd); /* probably unnecessary */ diff --git a/mm/ksm.c b/mm/ksm.c index 6b27c4f0fb1f..97757c5fa15f 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1051,7 +1051,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, BUG_ON(PageTransCompound(page)); - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, mm, pvmw.address, pvmw.address + PAGE_SIZE); mmu_notifier_invalidate_range_start(&range); @@ -1140,7 +1140,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, if (!pmd) goto out; - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, addr, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, mm, addr, addr + PAGE_SIZE); mmu_notifier_invalidate_range_start(&range); diff --git a/mm/madvise.c b/mm/madvise.c index 04446dabba56..a2f91bd286d9 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -472,7 +472,7 @@ static int madvise_free_single_vma(struct vm_area_struct *vma, range.end = min(vma->vm_end, end_addr); if (range.end <= vma->vm_start) return -EINVAL; - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, mm, range.start, range.end); lru_add_drain(); diff --git a/mm/memory.c b/mm/memory.c index d9b7c935e812..a8c6922526f6 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1009,8 +1009,8 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, is_cow = is_cow_mapping(vma->vm_flags); if (is_cow) { - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, src_mm, - addr, end); + mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE, + vma, src_mm, addr, end); mmu_notifier_invalidate_range_start(&range); } @@ -1334,7 +1334,7 @@ void unmap_vmas(struct mmu_gather *tlb, { struct mmu_notifier_range range; - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, NULL, vma->vm_mm, start_addr, end_addr); mmu_notifier_invalidate_range_start(&range); for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next) @@ -1357,7 +1357,7 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start, struct mmu_gather tlb; lru_add_drain(); - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, vma->vm_mm, start, start + size); tlb_gather_mmu(&tlb, vma->vm_mm, start, range.end); update_hiwater_rss(vma->vm_mm); @@ -1384,7 +1384,7 @@ static void zap_page_range_single(struct vm_area_struct *vma, unsigned long addr struct mmu_gather tlb; lru_add_drain(); - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, vma->vm_mm, address, address + size); tlb_gather_mmu(&tlb, vma->vm_mm, address, range.end); update_hiwater_rss(vma->vm_mm); @@ -2275,7 +2275,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) __SetPageUptodate(new_page); - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, mm, vmf->address & PAGE_MASK, (vmf->address & PAGE_MASK) + PAGE_SIZE); mmu_notifier_invalidate_range_start(&range); @@ -4086,7 +4086,7 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address, goto out; if (range) { - mmu_notifier_range_init(range, MMU_NOTIFY_UNMAP, NULL, + mmu_notifier_range_init(range, MMU_NOTIFY_CLEAR, NULL, mm, address & PMD_MASK, (address & PMD_MASK) + PMD_SIZE); mmu_notifier_invalidate_range_start(range); @@ -4105,7 +4105,7 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address, goto out; if (range) { - mmu_notifier_range_init(range, MMU_NOTIFY_UNMAP, NULL, mm, + mmu_notifier_range_init(range, MMU_NOTIFY_CLEAR, NULL, mm, address & PAGE_MASK, (address & PAGE_MASK) + PAGE_SIZE); mmu_notifier_invalidate_range_start(range); diff --git a/mm/migrate.c b/mm/migrate.c index 385c59d5c28d..384cde91d886 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2342,7 +2342,7 @@ static void migrate_vma_collect(struct migrate_vma *migrate) mm_walk.mm = migrate->vma->vm_mm; mm_walk.private = migrate; - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, NULL, mm_walk.mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, NULL, mm_walk.mm, migrate->start, migrate->end); mmu_notifier_invalidate_range_start(&range); @@ -2751,7 +2751,7 @@ static void migrate_vma_pages(struct migrate_vma *migrate) notified = true; mmu_notifier_range_init(&range, - MMU_NOTIFY_UNMAP, + MMU_NOTIFY_CLEAR, NULL, migrate->vma->vm_mm, addr, migrate->end); diff --git a/mm/mprotect.c b/mm/mprotect.c index b22e660701f1..c19e8bdc2648 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -185,8 +185,9 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma, /* invoke the mmu notifier if the pmd is populated */ if (!range.start) { - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, - vma->vm_mm, addr, end); + mmu_notifier_range_init(&range, + MMU_NOTIFY_PROTECTION_VMA, + vma, vma->vm_mm, addr, end); mmu_notifier_invalidate_range_start(&range); } diff --git a/mm/rmap.c b/mm/rmap.c index 49c75f0c6c33..81ea84ab511a 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -896,8 +896,8 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma, * We have to assume the worse case ie pmd for invalidation. Note that * the page can not be free from this function. */ - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, - address, + mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE, vma, + vma->vm_mm, address, min(vma->vm_end, address + (PAGE_SIZE << compound_order(page)))); mmu_notifier_invalidate_range_start(&range); @@ -1372,7 +1372,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma, * Note that the page can not be free in this function as call of * try_to_unmap() must hold a reference on the page. */ - mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, vma, vma->vm_mm, + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, vma, vma->vm_mm, address, min(vma->vm_end, address + (PAGE_SIZE << compound_order(page)))); From patchwork Wed Jan 23 22:23:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10777985 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CF6841390 for ; Wed, 23 Jan 2019 22:23:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C137B2D368 for ; Wed, 23 Jan 2019 22:23:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B4F972D3E2; Wed, 23 Jan 2019 22:23:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3B48B2D368 for ; Wed, 23 Jan 2019 22:23:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727219AbfAWWXm (ORCPT ); Wed, 23 Jan 2019 17:23:42 -0500 Received: from mx1.redhat.com ([209.132.183.28]:46712 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727200AbfAWWXl (ORCPT ); Wed, 23 Jan 2019 17:23:41 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C9341D7D58; Wed, 23 Jan 2019 22:23:40 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 21DE26A685; Wed, 23 Jan 2019 22:23:38 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 4/9] mm/mmu_notifier: pass down vma and reasons why mmu notifier is happening Date: Wed, 23 Jan 2019 17:23:10 -0500 Message-Id: <20190123222315.1122-5-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 23 Jan 2019 22:23:41 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse CPU page table update can happens for many reasons, not only as a result of a syscall (munmap(), mprotect(), mremap(), madvise(), ...) but also as a result of kernel activities (memory compression, reclaim, migration, ...). Users of mmu notifier API track changes to the CPU page table and take specific action for them. While current API only provide range of virtual address affected by the change, not why the changes is happening This patch is just passing down the new informations by adding it to the mmu_notifier_range structure. Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- include/linux/mmu_notifier.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index a9808add4070..7514775817de 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -56,9 +56,11 @@ struct mmu_notifier_mm { }; struct mmu_notifier_range { + struct vm_area_struct *vma; struct mm_struct *mm; unsigned long start; unsigned long end; + enum mmu_notifier_event event; bool blockable; }; @@ -354,6 +356,8 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range, unsigned long start, unsigned long end) { + range->vma = vma; + range->event = event; range->mm = mm; range->start = start; range->end = end; From patchwork Wed Jan 23 22:23:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10777993 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EB1811390 for ; Wed, 23 Jan 2019 22:23:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DAFD82D368 for ; Wed, 23 Jan 2019 22:23:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CE9992D396; Wed, 23 Jan 2019 22:23:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5C2492D368 for ; Wed, 23 Jan 2019 22:23:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727254AbfAWWXp (ORCPT ); Wed, 23 Jan 2019 17:23:45 -0500 Received: from mx1.redhat.com ([209.132.183.28]:46752 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727228AbfAWWXo (ORCPT ); Wed, 23 Jan 2019 17:23:44 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 86234CC0A8; Wed, 23 Jan 2019 22:23:43 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id E90475D964; Wed, 23 Jan 2019 22:23:40 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 5/9] mm/mmu_notifier: mmu_notifier_range_update_to_read_only() helper Date: Wed, 23 Jan 2019 17:23:11 -0500 Message-Id: <20190123222315.1122-6-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 23 Jan 2019 22:23:43 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse Helper to test if a range is updated to read only (it is still valid to read from the range). This is useful for device driver or anyone who wish to optimize out update when they know that they already have the range map read only. Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- include/linux/mmu_notifier.h | 4 ++++ mm/mmu_notifier.c | 10 ++++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 7514775817de..be873c431886 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -257,6 +257,8 @@ extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r, bool only_end); extern void __mmu_notifier_invalidate_range(struct mm_struct *mm, unsigned long start, unsigned long end); +extern bool +mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range); static inline void mmu_notifier_release(struct mm_struct *mm) { @@ -553,6 +555,8 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) { } +#define mmu_notifier_range_update_to_read_only(r) false + #define ptep_clear_flush_young_notify ptep_clear_flush_young #define pmdp_clear_flush_young_notify pmdp_clear_flush_young #define ptep_clear_young_notify ptep_test_and_clear_young diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 9c884abc7850..0b2f77715a08 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -395,3 +395,13 @@ void mmu_notifier_unregister_no_release(struct mmu_notifier *mn, mmdrop(mm); } EXPORT_SYMBOL_GPL(mmu_notifier_unregister_no_release); + +bool +mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range) +{ + if (!range->vma || range->event != MMU_NOTIFY_PROTECTION_VMA) + return false; + /* Return true if the vma still have the read flag set. */ + return range->vma->vm_flags & VM_READ; +} +EXPORT_SYMBOL_GPL(mmu_notifier_range_update_to_read_only); From patchwork Wed Jan 23 22:23:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10778027 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B3E9F1390 for ; Wed, 23 Jan 2019 22:24:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A5B892C4E4 for ; Wed, 23 Jan 2019 22:24:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 99E852C4FF; Wed, 23 Jan 2019 22:24:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3745F2C4E4 for ; Wed, 23 Jan 2019 22:24:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727309AbfAWWXv (ORCPT ); Wed, 23 Jan 2019 17:23:51 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57982 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727271AbfAWWXr (ORCPT ); Wed, 23 Jan 2019 17:23:47 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 61CC618DF61; Wed, 23 Jan 2019 22:23:46 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id B5EAC5D965; Wed, 23 Jan 2019 22:23:43 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 6/9] gpu/drm/radeon: optimize out the case when a range is updated to read only Date: Wed, 23 Jan 2019 17:23:12 -0500 Message-Id: <20190123222315.1122-7-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 23 Jan 2019 22:23:46 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse When range of virtual address is updated read only and corresponding user ptr object are already read only it is pointless to do anything. Optimize this case out. Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- drivers/gpu/drm/radeon/radeon_mn.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c index b3019505065a..f77294f58e63 100644 --- a/drivers/gpu/drm/radeon/radeon_mn.c +++ b/drivers/gpu/drm/radeon/radeon_mn.c @@ -124,6 +124,7 @@ static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn, struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); struct ttm_operation_ctx ctx = { false, false }; struct interval_tree_node *it; + bool update_to_read_only; unsigned long end; int ret = 0; @@ -138,6 +139,8 @@ static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn, else if (!mutex_trylock(&rmn->lock)) return -EAGAIN; + update_to_read_only = mmu_notifier_range_update_to_read_only(range); + it = interval_tree_iter_first(&rmn->objects, range->start, end); while (it) { struct radeon_mn_node *node; @@ -153,10 +156,20 @@ static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn, it = interval_tree_iter_next(it, range->start, end); list_for_each_entry(bo, &node->bos, mn_list) { + bool read_only; if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound) continue; + /* + * If it is already read only and we are updating to + * read only then we do not need to change anything. + * So save time and skip this one. + */ + read_only = radeon_ttm_tt_is_readonly(bo->tbo.ttm); + if (update_to_read_only && read_only) + continue; + r = radeon_bo_reserve(bo, true); if (r) { DRM_ERROR("(%ld) failed to reserve user bo\n", r); From patchwork Wed Jan 23 22:23:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10778033 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A2E651390 for ; Wed, 23 Jan 2019 22:24:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 94EBC2C4FF for ; Wed, 23 Jan 2019 22:24:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 894212C509; Wed, 23 Jan 2019 22:24:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 21EA22C4FF for ; Wed, 23 Jan 2019 22:24:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727356AbfAWWYP (ORCPT ); Wed, 23 Jan 2019 17:24:15 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54486 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727297AbfAWWXt (ORCPT ); Wed, 23 Jan 2019 17:23:49 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2DA69432A0; Wed, 23 Jan 2019 22:23:49 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 87EAF6A685; Wed, 23 Jan 2019 22:23:46 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 7/9] gpu/drm/amdgpu: optimize out the case when a range is updated to read only Date: Wed, 23 Jan 2019 17:23:13 -0500 Message-Id: <20190123222315.1122-8-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 23 Jan 2019 22:23:49 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse When range of virtual address is updated read only and corresponding user ptr object are already read only it is pointless to do anything. Optimize this case out. Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c index 3e6823fdd939..7880eda064cd 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c @@ -294,6 +294,7 @@ static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn, { struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn); struct interval_tree_node *it; + bool update_to_read_only; unsigned long end; /* notification is exclusive, but interval is inclusive */ @@ -302,6 +303,8 @@ static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn, if (amdgpu_mn_read_lock(amn, range->blockable)) return -EAGAIN; + update_to_read_only = mmu_notifier_range_update_to_read_only(range); + it = interval_tree_iter_first(&amn->objects, range->start, end); while (it) { struct amdgpu_mn_node *node; @@ -317,6 +320,16 @@ static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn, list_for_each_entry(bo, &node->bos, mn_list) { struct kgd_mem *mem = bo->kfd_bo; + bool read_only; + + /* + * If it is already read only and we are updating to + * read only then we do not need to change anything. + * So save time and skip this one. + */ + read_only = amdgpu_ttm_tt_is_readonly(bo->tbo.ttm); + if (update_to_read_only && read_only) + continue; if (amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, range->start, From patchwork Wed Jan 23 22:23:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10778023 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 820CE1390 for ; Wed, 23 Jan 2019 22:24:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 74B462C4E4 for ; Wed, 23 Jan 2019 22:24:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 683232C4FE; Wed, 23 Jan 2019 22:24:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E92362C4E4 for ; Wed, 23 Jan 2019 22:24:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727342AbfAWWXx (ORCPT ); Wed, 23 Jan 2019 17:23:53 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54554 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727335AbfAWWXw (ORCPT ); Wed, 23 Jan 2019 17:23:52 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 067D8432C1; Wed, 23 Jan 2019 22:23:52 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5CF0E5D965; Wed, 23 Jan 2019 22:23:49 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 8/9] gpu/drm/i915: optimize out the case when a range is updated to read only Date: Wed, 23 Jan 2019 17:23:14 -0500 Message-Id: <20190123222315.1122-9-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 23 Jan 2019 22:23:52 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse When range of virtual address is updated read only and corresponding user ptr object are already read only it is pointless to do anything. Optimize this case out. Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- drivers/gpu/drm/i915/i915_gem_userptr.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c index 9558582c105e..23330ac3d7ea 100644 --- a/drivers/gpu/drm/i915/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c @@ -59,6 +59,7 @@ struct i915_mmu_object { struct interval_tree_node it; struct list_head link; struct work_struct work; + bool read_only; bool attached; }; @@ -119,6 +120,7 @@ static int i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier *_mn, container_of(_mn, struct i915_mmu_notifier, mn); struct i915_mmu_object *mo; struct interval_tree_node *it; + bool update_to_read_only; LIST_HEAD(cancelled); unsigned long end; @@ -128,6 +130,8 @@ static int i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier *_mn, /* interval ranges are inclusive, but invalidate range is exclusive */ end = range->end - 1; + update_to_read_only = mmu_notifier_range_update_to_read_only(range); + spin_lock(&mn->lock); it = interval_tree_iter_first(&mn->objects, range->start, end); while (it) { @@ -145,6 +149,17 @@ static int i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier *_mn, * object if it is not in the process of being destroyed. */ mo = container_of(it, struct i915_mmu_object, it); + + /* + * If it is already read only and we are updating to + * read only then we do not need to change anything. + * So save time and skip this one. + */ + if (update_to_read_only && mo->read_only) { + it = interval_tree_iter_next(it, range->start, end); + continue; + } + if (kref_get_unless_zero(&mo->obj->base.refcount)) queue_work(mn->wq, &mo->work); @@ -270,6 +285,7 @@ i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object *obj, mo->mn = mn; mo->obj = obj; mo->it.start = obj->userptr.ptr; + mo->read_only = i915_gem_object_is_readonly(obj); mo->it.last = obj->userptr.ptr + obj->base.size - 1; INIT_WORK(&mo->work, cancel_userptr); From patchwork Wed Jan 23 22:23:15 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10778019 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 445B91390 for ; Wed, 23 Jan 2019 22:24:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 343CF2C4F8 for ; Wed, 23 Jan 2019 22:24:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 289AD2C4FF; Wed, 23 Jan 2019 22:24:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AE2602C4FE for ; Wed, 23 Jan 2019 22:24:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727388AbfAWWX4 (ORCPT ); Wed, 23 Jan 2019 17:23:56 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54594 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727356AbfAWWXz (ORCPT ); Wed, 23 Jan 2019 17:23:55 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D387F432A0; Wed, 23 Jan 2019 22:23:54 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-120-127.rdu2.redhat.com [10.10.120.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3606D6A685; Wed, 23 Jan 2019 22:23:52 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , =?utf-8?q?Christian_?= =?utf-8?q?K=C3=B6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 9/9] RDMA/umem_odp: optimize out the case when a range is updated to read only Date: Wed, 23 Jan 2019 17:23:15 -0500 Message-Id: <20190123222315.1122-10-jglisse@redhat.com> In-Reply-To: <20190123222315.1122-1-jglisse@redhat.com> References: <20190123222315.1122-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 23 Jan 2019 22:23:55 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse When range of virtual address is updated read only and corresponding user ptr object are already read only it is pointless to do anything. Optimize this case out. Signed-off-by: Jérôme Glisse Cc: Christian König Cc: Jan Kara Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Andrew Morton Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: Arnd Bergmann --- drivers/infiniband/core/umem_odp.c | 22 +++++++++++++++++++--- include/rdma/ib_umem_odp.h | 1 + 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c index a4ec43093cb3..fa4e7fdcabfc 100644 --- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -140,8 +140,15 @@ static void ib_umem_notifier_release(struct mmu_notifier *mn, static int invalidate_range_start_trampoline(struct ib_umem_odp *item, u64 start, u64 end, void *cookie) { + bool update_to_read_only = *((bool *)cookie); + ib_umem_notifier_start_account(item); - item->umem.context->invalidate_range(item, start, end); + /* + * If it is already read only and we are updating to read only then we + * do not need to change anything. So save time and skip this one. + */ + if (!update_to_read_only || !item->read_only) + item->umem.context->invalidate_range(item, start, end); return 0; } @@ -150,6 +157,7 @@ static int ib_umem_notifier_invalidate_range_start(struct mmu_notifier *mn, { struct ib_ucontext_per_mm *per_mm = container_of(mn, struct ib_ucontext_per_mm, mn); + bool update_to_read_only; if (range->blockable) down_read(&per_mm->umem_rwsem); @@ -166,10 +174,13 @@ static int ib_umem_notifier_invalidate_range_start(struct mmu_notifier *mn, return 0; } + update_to_read_only = mmu_notifier_range_update_to_read_only(range); + return rbt_ib_umem_for_each_in_range(&per_mm->umem_tree, range->start, range->end, invalidate_range_start_trampoline, - range->blockable, NULL); + range->blockable, + &update_to_read_only); } static int invalidate_range_end_trampoline(struct ib_umem_odp *item, u64 start, @@ -363,6 +374,9 @@ struct ib_umem_odp *ib_alloc_odp_umem(struct ib_ucontext_per_mm *per_mm, goto out_odp_data; } + /* Assume read only at first, each time GUP is call this is updated. */ + odp_data->read_only = true; + odp_data->dma_list = vzalloc(array_size(pages, sizeof(*odp_data->dma_list))); if (!odp_data->dma_list) { @@ -619,8 +633,10 @@ int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 user_virt, goto out_put_task; } - if (access_mask & ODP_WRITE_ALLOWED_BIT) + if (access_mask & ODP_WRITE_ALLOWED_BIT) { + umem_odp->read_only = false; flags |= FOLL_WRITE; + } start_idx = (user_virt - ib_umem_start(umem)) >> page_shift; k = start_idx; diff --git a/include/rdma/ib_umem_odp.h b/include/rdma/ib_umem_odp.h index 0b1446fe2fab..8256668c6170 100644 --- a/include/rdma/ib_umem_odp.h +++ b/include/rdma/ib_umem_odp.h @@ -76,6 +76,7 @@ struct ib_umem_odp { struct completion notifier_completion; int dying; struct work_struct work; + bool read_only; }; static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)