From mboxrd@z Thu Jan 1 00:00:00 1970 From: jglisse@redhat.com Subject: [PATCH v5 4/9] mm/mmu_notifier: contextual information for event enums Date: Tue, 19 Feb 2019 15:04:25 -0500 Message-ID: <20190219200430.11130-5-jglisse@redhat.com> References: <20190219200430.11130-1-jglisse@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20190219200430.11130-1-jglisse@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: linux-mm@kvack.org, Andrew Morton Cc: Jan Kara , kvm@vger.kernel.org, =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , dri-devel@lists.freedesktop.org, Michal Hocko , Ross Zwisler , Andrea Arcangeli , linux-rdma@vger.kernel.org, Jason Gunthorpe , Ralph Campbell , Arnd Bergmann , John Hubbard , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Peter Xu , Rodrigo Vivi , Dan Williams , Felix Kuehling , linux-kernel@vger.kernel.org, Paolo Bonzini , =?UTF-8?q?Christian=20K=C3=B6nig?= List-Id: linux-rdma@vger.kernel.org RnJvbTogSsOpcsO0bWUgR2xpc3NlIDxqZ2xpc3NlQHJlZGhhdC5jb20+CgpDUFUgcGFnZSB0YWJs ZSB1cGRhdGUgY2FuIGhhcHBlbnMgZm9yIG1hbnkgcmVhc29ucywgbm90IG9ubHkgYXMgYSByZXN1 bHQKb2YgYSBzeXNjYWxsIChtdW5tYXAoKSwgbXByb3RlY3QoKSwgbXJlbWFwKCksIG1hZHZpc2Uo KSwgLi4uKSBidXQgYWxzbwphcyBhIHJlc3VsdCBvZiBrZXJuZWwgYWN0aXZpdGllcyAobWVtb3J5 IGNvbXByZXNzaW9uLCByZWNsYWltLCBtaWdyYXRpb24sCi4uLikuCgpUaGlzIHBhdGNoIGludHJv ZHVjZSBhIHNldCBvZiBlbnVtcyB0aGF0IGNhbiBiZSBhc3NvY2lhdGVkIHdpdGggZWFjaCBvZgp0 aGUgZXZlbnRzIHRyaWdnZXJpbmcgYSBtbXUgbm90aWZpZXIuIExhdHRlciBwYXRjaGVzIHRha2Ug YWR2YW50YWdlcyBvZgp0aG9zZSBlbnVtIHZhbHVlcy4KCiAgICAtIFVOTUFQOiBtdW5tYXAoKSBv ciBtcmVtYXAoKQogICAgLSBDTEVBUjogcGFnZSB0YWJsZSBpcyBjbGVhcmVkIChtaWdyYXRpb24s IGNvbXBhY3Rpb24sIHJlY2xhaW0sIC4uLikKICAgIC0gUFJPVEVDVElPTl9WTUE6IGNoYW5nZSBp biBhY2Nlc3MgcHJvdGVjdGlvbnMgZm9yIHRoZSByYW5nZQogICAgLSBQUk9URUNUSU9OX1BBR0U6 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[209.132.183.28]) by mx.google.com with ESMTPS id r46si2248581qta.43.2019.02.19.12.05.10 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Feb 2019 12:05:10 -0800 (PST) Received-SPF: pass (google.com: domain of jglisse@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of jglisse@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=jglisse@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DB5ADC1047E2; Tue, 19 Feb 2019 20:05:08 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-122-134.rdu2.redhat.com [10.10.122.134]) by smtp.corp.redhat.com (Postfix) with ESMTP id 32198600C8; Tue, 19 Feb 2019 20:04:57 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org, Andrew Morton Cc: linux-kernel@vger.kernel.org, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , =?UTF-8?q?Christian=20K=C3=B6nig?= , Joonas Lahtinen , Jani Nikula , Rodrigo Vivi , Jan Kara , Andrea Arcangeli , Peter Xu , Felix Kuehling , Jason Gunthorpe , Ross Zwisler , Dan Williams , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, Arnd Bergmann Subject: [PATCH v5 4/9] mm/mmu_notifier: contextual information for event enums Date: Tue, 19 Feb 2019 15:04:25 -0500 Message-Id: <20190219200430.11130-5-jglisse@redhat.com> In-Reply-To: <20190219200430.11130-1-jglisse@redhat.com> References: <20190219200430.11130-1-jglisse@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Tue, 19 Feb 2019 20:05:09 +0000 (UTC) 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: 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: Joonas Lahtinen Cc: Jani Nikula Cc: Rodrigo Vivi Cc: Jan Kara Cc: Andrea Arcangeli Cc: Peter Xu Cc: Felix Kuehling Cc: Jason Gunthorpe Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Michal Hocko Cc: Christian Koenig Cc: Ralph Campbell Cc: John Hubbard Cc: kvm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: linux-rdma@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 c8672c366f67..2386e71ac1b8 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 /* -- 2.17.2