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GET /api/patches/811811/?format=api
{ "id": 811811, "url": "http://patchwork.ozlabs.org/api/patches/811811/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/1504894024-2750-21-git-send-email-ldufour@linux.vnet.ibm.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<1504894024-2750-21-git-send-email-ldufour@linux.vnet.ibm.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/1504894024-2750-21-git-send-email-ldufour@linux.vnet.ibm.com/", "date": "2017-09-08T18:07:04", "name": "[v3,20/20] powerpc/mm: Add speculative page fault", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": false, "hash": "498a12d56a3a1f1622de2788d93fb48a41113147", "submitter": { "id": 40248, "url": "http://patchwork.ozlabs.org/api/people/40248/?format=api", "name": "Laurent Dufour", "email": "ldufour@linux.vnet.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/1504894024-2750-21-git-send-email-ldufour@linux.vnet.ibm.com/mbox/", "series": [ { "id": 2269, "url": "http://patchwork.ozlabs.org/api/series/2269/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=2269", "date": "2017-09-08T18:06:44", "name": "Speculative page faults", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/2269/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/811811/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/811811/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "patchwork-incoming@ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": [ "patchwork-incoming@ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Received": [ "from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xpn7h29vqz9sRV\n\tfor <patchwork-incoming@ozlabs.org>;\n\tSat, 9 Sep 2017 05:14:40 +1000 (AEST)", "from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xpn7g4Db3zDqYN\n\tfor <patchwork-incoming@ozlabs.org>;\n\tSat, 9 Sep 2017 05:14:39 +1000 (AEST)", "from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com\n\t[148.163.158.5])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xplgL5qW5zDrZW\n\tfor <linuxppc-dev@lists.ozlabs.org>;\n\tSat, 9 Sep 2017 04:08:30 +1000 (AEST)", "from pps.filterd (m0098416.ppops.net [127.0.0.1])\n\tby mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id\n\tv88I4SJN043914\n\tfor <linuxppc-dev@lists.ozlabs.org>; Fri, 8 Sep 2017 14:08:26 -0400", "from e06smtp15.uk.ibm.com (e06smtp15.uk.ibm.com [195.75.94.111])\n\tby mx0b-001b2d01.pphosted.com with ESMTP id 2cuw50sfh1-1\n\t(version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT)\n\tfor <linuxppc-dev@lists.ozlabs.org>; Fri, 08 Sep 2017 14:08:26 -0400", "from localhost\n\tby e06smtp15.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use\n\tOnly! Violators will be prosecuted\n\tfor <linuxppc-dev@lists.ozlabs.org> from <ldufour@linux.vnet.ibm.com>;\n\tFri, 8 Sep 2017 19:08:24 +0100", "from b06cxnps4076.portsmouth.uk.ibm.com (9.149.109.198)\n\tby e06smtp15.uk.ibm.com (192.168.101.145) with IBM ESMTP SMTP\n\tGateway: Authorized Use Only! Violators will be prosecuted; \n\tFri, 8 Sep 2017 19:08:18 +0100", "from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com\n\t[9.149.105.60])\n\tby b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with\n\tESMTP id v88I8Hft11796658; Fri, 8 Sep 2017 18:08:17 GMT", "from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1])\n\tby IMSVA (Postfix) with ESMTP id B131E42041;\n\tFri, 8 Sep 2017 19:04:44 +0100 (BST)", "from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1])\n\tby IMSVA (Postfix) with ESMTP id 0132A4203F;\n\tFri, 8 Sep 2017 19:04:43 +0100 (BST)", "from nimbus.lab.toulouse-stg.fr.ibm.com (unknown [9.145.31.125])\n\tby d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP;\n\tFri, 8 Sep 2017 19:04:42 +0100 (BST)" ], "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=linux.vnet.ibm.com\n\t(client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com;\n\tenvelope-from=ldufour@linux.vnet.ibm.com; receiver=<UNKNOWN>)", "From": "Laurent Dufour <ldufour@linux.vnet.ibm.com>", "To": "paulmck@linux.vnet.ibm.com, peterz@infradead.org,\n\takpm@linux-foundation.org, kirill@shutemov.name, ak@linux.intel.com, \n\tmhocko@kernel.org, dave@stgolabs.net, jack@suse.cz,\n\tMatthew Wilcox <willy@infradead.org>, benh@kernel.crashing.org,\n\tmpe@ellerman.id.au, paulus@samba.org,\n\tThomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, \n\thpa@zytor.com, Will Deacon <will.deacon@arm.com>,\n\tSergey Senozhatsky <sergey.senozhatsky@gmail.com>", "Subject": "[PATCH v3 20/20] powerpc/mm: Add speculative page fault", "Date": "Fri, 8 Sep 2017 20:07:04 +0200", "X-Mailer": "git-send-email 2.7.4", "In-Reply-To": "<1504894024-2750-1-git-send-email-ldufour@linux.vnet.ibm.com>", "References": "<1504894024-2750-1-git-send-email-ldufour@linux.vnet.ibm.com>", "X-TM-AS-GCONF": "00", "x-cbid": "17090818-0020-0000-0000-000003B69F52", "X-IBM-AV-DETECTION": "SAVI=unused REMOTE=unused XFE=unused", "x-cbparentid": "17090818-0021-0000-0000-00004247AABF", "Message-Id": "<1504894024-2750-21-git-send-email-ldufour@linux.vnet.ibm.com>", "X-Proofpoint-Virus-Version": "vendor=fsecure engine=2.50.10432:, ,\n\tdefinitions=2017-09-08_12:, , signatures=0", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n\tspamscore=0 suspectscore=0\n\tmalwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam\n\tadjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000\n\tdefinitions=main-1709080270", "X-BeenThere": "linuxppc-dev@lists.ozlabs.org", "X-Mailman-Version": "2.1.23", "Precedence": "list", "List-Id": "Linux on PowerPC Developers Mail List\n\t<linuxppc-dev.lists.ozlabs.org>", "List-Unsubscribe": "<https://lists.ozlabs.org/options/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>", "List-Archive": "<http://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>", "List-Subscribe": "<https://lists.ozlabs.org/listinfo/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>", "Cc": "linuxppc-dev@lists.ozlabs.org, x86@kernel.org,\n\tlinux-kernel@vger.kernel.org, npiggin@gmail.com, linux-mm@kvack.org,\n\tTim Chen <tim.c.chen@linux.intel.com>, \n\tharen@linux.vnet.ibm.com, khandual@linux.vnet.ibm.com", "Errors-To": "linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org", "Sender": "\"Linuxppc-dev\"\n\t<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>" }, "content": "This patch enable the speculative page fault on the PowerPC\narchitecture.\n\nThis will try a speculative page fault without holding the mmap_sem,\nif it returns with VM_FAULT_RETRY, the mmap_sem is acquired and the\ntraditional page fault processing is done.\n\nSupport is only provide for BOOK3S_64 currently because:\n- require CONFIG_PPC_STD_MMU because checks done in\n set_access_flags_filter()\n- require BOOK3S because we can't support for book3e_hugetlb_preload()\n called by update_mmu_cache()\n\nSigned-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>\n---\n arch/powerpc/include/asm/book3s/64/pgtable.h | 5 +++++\n arch/powerpc/mm/fault.c | 15 +++++++++++++++\n 2 files changed, 20 insertions(+)", "diff": "diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h\nindex b9aff515b4de..470203daf97e 100644\n--- a/arch/powerpc/include/asm/book3s/64/pgtable.h\n+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h\n@@ -314,6 +314,11 @@ extern unsigned long pci_io_base;\n /* Advertise support for _PAGE_SPECIAL */\n #define __HAVE_ARCH_PTE_SPECIAL\n \n+/* Advertise that we call the Speculative Page Fault handler */\n+#if defined(CONFIG_PPC_BOOK3S_64)\n+#define __HAVE_ARCH_CALL_SPF\n+#endif\n+\n #ifndef __ASSEMBLY__\n \n /*\ndiff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c\nindex 4797d08581ce..97c7de242627 100644\n--- a/arch/powerpc/mm/fault.c\n+++ b/arch/powerpc/mm/fault.c\n@@ -442,6 +442,20 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,\n \tif (is_exec)\n \t\tflags |= FAULT_FLAG_INSTRUCTION;\n \n+#if defined(__HAVE_ARCH_CALL_SPF)\n+\tif (is_user) {\n+\t\t/* let's try a speculative page fault without grabbing the\n+\t\t * mmap_sem.\n+\t\t */\n+\t\tfault = handle_speculative_fault(mm, address, flags);\n+\t\tif (!(fault & VM_FAULT_RETRY)) {\n+\t\t\tperf_sw_event(PERF_COUNT_SW_SPF, 1,\n+\t\t\t\t regs, address);\n+\t\t\tgoto done;\n+\t\t}\n+\t}\n+#endif /* defined(__HAVE_ARCH_CALL_SPF) */\n+\n \t/* When running in the kernel we expect faults to occur only to\n \t * addresses in user space. All other faults represent errors in the\n \t * kernel and should generate an OOPS. Unfortunately, in the case of an\n@@ -526,6 +540,7 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,\n \n \tup_read(¤t->mm->mmap_sem);\n \n+done:\n \tif (unlikely(fault & VM_FAULT_ERROR))\n \t\treturn mm_fault_error(regs, address, fault);\n \n", "prefixes": [ "v3", "20/20" ] }