Message ID | 1526555193-7242-27-git-send-email-ldufour@linux.vnet.ibm.com (mailing list archive) |
---|---|
State | Not Applicable |
Headers | show
Return-Path: <linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org> X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40mqY65WSyz9s0q for <patchwork-incoming@ozlabs.org>; Thu, 17 May 2018 21:57:14 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.vnet.ibm.com Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 40mqY64K9NzF25v for <patchwork-incoming@ozlabs.org>; Thu, 17 May 2018 21:57:14 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.vnet.ibm.com X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=linux.vnet.ibm.com (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com; envelope-from=ldufour@linux.vnet.ibm.com; receiver=<UNKNOWN>) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.vnet.ibm.com Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40mpS56RFszF1nc for <linuxppc-dev@lists.ozlabs.org>; Thu, 17 May 2018 21:07:49 +1000 (AEST) Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4HB4YNf179693 for <linuxppc-dev@lists.ozlabs.org>; Thu, 17 May 2018 07:07:46 -0400 Received: from e06smtp12.uk.ibm.com (e06smtp12.uk.ibm.com [195.75.94.108]) by mx0b-001b2d01.pphosted.com with ESMTP id 2j1576235e-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for <linuxppc-dev@lists.ozlabs.org>; Thu, 17 May 2018 07:07:46 -0400 Received: from localhost by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 17 May 2018 12:07:36 +0100 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w4HB7Z6d7733550; Thu, 17 May 2018 11:07:35 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6FB734C04A; Thu, 17 May 2018 11:59:24 +0100 (BST) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 269BB4C050; Thu, 17 May 2018 11:59:23 +0100 (BST) Received: from nimbus.lab.toulouse-stg.fr.ibm.com (unknown [9.101.4.33]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 17 May 2018 11:59:23 +0100 (BST) From: Laurent Dufour <ldufour@linux.vnet.ibm.com> To: akpm@linux-foundation.org, mhocko@kernel.org, peterz@infradead.org, kirill@shutemov.name, ak@linux.intel.com, dave@stgolabs.net, jack@suse.cz, Matthew Wilcox <willy@infradead.org>, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, benh@kernel.crashing.org, mpe@ellerman.id.au, paulus@samba.org, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, hpa@zytor.com, Will Deacon <will.deacon@arm.com>, Sergey Senozhatsky <sergey.senozhatsky@gmail.com>, sergey.senozhatsky.work@gmail.com, Andrea Arcangeli <aarcange@redhat.com>, Alexei Starovoitov <alexei.starovoitov@gmail.com>, kemi.wang@intel.com, Daniel Jordan <daniel.m.jordan@oracle.com>, David Rientjes <rientjes@google.com>, Jerome Glisse <jglisse@redhat.com>, Ganesh Mahendran <opensource.ganesh@gmail.com>, Minchan Kim <minchan@kernel.org>, Punit Agrawal <punitagrawal@gmail.com>, vinayak menon <vinayakm.list@gmail.com>, Yang Shi <yang.shi@linux.alibaba.com> Subject: [PATCH v11 26/26] arm64/mm: add speculative page fault Date: Thu, 17 May 2018 13:06:33 +0200 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1526555193-7242-1-git-send-email-ldufour@linux.vnet.ibm.com> References: <1526555193-7242-1-git-send-email-ldufour@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18051711-0008-0000-0000-000004F77992 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18051711-0009-0000-0000-00001E8BEE07 Message-Id: <1526555193-7242-27-git-send-email-ldufour@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-05-17_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1805170100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org> List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>, <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>, <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe> Cc: linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, npiggin@gmail.com, linux-mm@kvack.org, paulmck@linux.vnet.ibm.com, Tim Chen <tim.c.chen@linux.intel.com>, haren@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" <linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org> |
Series |
Speculative page faults
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expand
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diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 91c53a7d2575..fb9f840367f9 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -411,6 +411,16 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr, perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr); /* + * let's try a speculative page fault without grabbing the + * mmap_sem. + */ + fault = handle_speculative_fault(mm, addr, mm_flags); + if (fault != VM_FAULT_RETRY) { + perf_sw_event(PERF_COUNT_SW_SPF, 1, regs, addr); + goto done; + } + + /* * As per x86, we may deadlock here. However, since the kernel only * validly references user space from well defined areas of the code, * we can bug out early if this is from code which shouldn't. @@ -460,6 +470,8 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr, } up_read(&mm->mmap_sem); +done: + /* * Handle the "normal" (no error) case first. */