From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 3A1396B0253 for ; Thu, 4 Aug 2016 04:14:29 -0400 (EDT) Received: by mail-pf0-f198.google.com with SMTP id h186so443707524pfg.2 for ; Thu, 04 Aug 2016 01:14:29 -0700 (PDT) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com. [148.163.156.1]) by mx.google.com with ESMTPS id r27si13474770pfi.37.2016.08.04.01.14.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 04 Aug 2016 01:14:28 -0700 (PDT) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u748DrxY130316 for ; Thu, 4 Aug 2016 04:14:28 -0400 Received: from e06smtp08.uk.ibm.com (e06smtp08.uk.ibm.com [195.75.94.104]) by mx0a-001b2d01.pphosted.com with ESMTP id 24kngchkth-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 04 Aug 2016 04:14:27 -0400 Received: from localhost by e06smtp08.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 4 Aug 2016 09:14:25 +0100 Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id 7CFBF17D805A for ; Thu, 4 Aug 2016 09:16:00 +0100 (BST) Received: from d06av08.portsmouth.uk.ibm.com (d06av08.portsmouth.uk.ibm.com [9.149.37.249]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u748ENdx14352396 for ; Thu, 4 Aug 2016 08:14:23 GMT Received: from d06av08.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av08.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u748ENkT031795 for ; Thu, 4 Aug 2016 02:14:23 -0600 From: Mike Rapoport Subject: [PATCH 0/7] userfaultfd: add support for shared memory Date: Thu, 4 Aug 2016 11:14:11 +0300 Message-Id: <1470298458-9925-1-git-send-email-rppt@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrea Arcangeli Cc: Hugh Dickins , Pavel Emelyanov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Mike Rapoport These patches enable userfaultfd support for shared memory mappings. The VMAs backed with shmem/tmpfs can be registered with userfaultfd which allows management of page faults in these areas by userland. This patch set adds implementation of shmem_mcopy_atomic_pte for proper handling of UFFDIO_COPY command. A callback to handle_userfault is added to shmem page fault handling path. The userfaultfd register/unregister methods are extended to allow shmem VMAs. The UFFDIO_ZEROPAGE and UFFDIO_REGISTER_MODE_WP are not implemented which is reflected by userfaultfd API handshake methods. The patches are based on current Andrea's tree: https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git Mike Rapoport (7): userfaultfd: introduce vma_can_userfault userfaultfd: shmem: add shmem_mcopy_atomic_pte for userfaultfd support userfaultfd: shmem: introduce vma_is_shmem userfaultfd: shmem: use shmem_mcopy_atomic_pte for shared memory userfaultfd: shmem: add userfaultfd hook for shared memory faults userfaultfd: shmem: allow registration of shared memory ranges userfaultfd: shmem: add userfaultfd_shmem test fs/userfaultfd.c | 32 ++++--- include/linux/mm.h | 10 +++ include/linux/shmem_fs.h | 11 +++ include/uapi/linux/userfaultfd.h | 2 +- mm/shmem.c | 139 +++++++++++++++++++++++++++++-- mm/userfaultfd.c | 31 ++++--- tools/testing/selftests/vm/Makefile | 3 + tools/testing/selftests/vm/run_vmtests | 11 +++ tools/testing/selftests/vm/userfaultfd.c | 39 ++++++++- 9 files changed, 237 insertions(+), 41 deletions(-) -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org