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[141.146.126.79]) by mx.google.com with ESMTPS id d12si11539222ioc.128.2019.04.05.10.39.05 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 05 Apr 2019 10:39:05 -0700 (PDT) Received-SPF: pass (google.com: domain of khalid.aziz@oracle.com designates 141.146.126.79 as permitted sender) client-ip=141.146.126.79; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2018-07-02 header.b=WlX0xHZB; spf=pass (google.com: domain of khalid.aziz@oracle.com designates 141.146.126.79 as permitted sender) smtp.mailfrom=khalid.aziz@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x35HNZ7d103905; Fri, 5 Apr 2019 17:37:45 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2018-07-02; bh=yhCfl/dsZCpeyHFNxA3bv0f5LElE2bX0taQuTIsB/uk=; b=WlX0xHZB2A31SaXIF2spbCzB8KM8iXDHR7cFwFgQs92U/71T9SrzQ/av0+D3eO2Xgt00 H/4X17j85Kv7DS68kFzTfO8cf7M0aBPctEvOH04kReF/7KdczslNVrO7DWFQvgpE48K8 PG3UfTczU/CY0ZQuuslxMa56/5ue12RXmja3oVPl63a5Of2LFktgGqusoU0vCC8D90Ob bDL+fQzy6n5FssRfIaauBnoCRIkmzOPqeRuwe0/yI7Fh2H7nyHZOSVh2RCRYz0Lcfz4b 0Z55Pb4WiH8VVDqviGPOmNF2OX4p3BOxwFvWVCGdnsj+fCB8NMzq9r7O5kKCCRWAJ8Ns yw== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by aserp2130.oracle.com with ESMTP id 2rhwydpafe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 05 Apr 2019 17:37:44 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x35HZgSJ098019; Fri, 5 Apr 2019 17:35:44 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3020.oracle.com with ESMTP id 2rp369ga9b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 05 Apr 2019 17:35:43 +0000 Received: from abhmp0019.oracle.com (abhmp0019.oracle.com [141.146.116.25]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x35HZR1K013561; Fri, 5 Apr 2019 17:35:27 GMT Received: from [192.168.1.16] (/24.9.64.241) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 05 Apr 2019 10:35:26 -0700 Subject: Re: [RFC PATCH v9 12/13] xpfo, mm: Defer TLB flushes for non-current CPUs (x86 only) To: Andy Lutomirski , Dave Hansen Cc: Thomas Gleixner , Andy Lutomirski , Juerg Haefliger , Tycho Andersen , jsteckli@amazon.de, Andi Kleen , liran.alon@oracle.com, Kees Cook , Konrad Rzeszutek Wilk , deepa.srinivasan@oracle.com, chris hyser , Tyler Hicks , "Woodhouse, David" , Andrew Cooper , Jon Masters , Boris Ostrovsky , kanth.ghatraju@oracle.com, Joao Martins , Jim Mattson , pradeep.vincent@oracle.com, John Haxby , "Kirill A. Shutemov" , Christoph Hellwig , steven.sistare@oracle.com, Laura Abbott , Peter Zijlstra , Aaron Lu , Andrew Morton , alexander.h.duyck@linux.intel.com, Amir Goldstein , Andrey Konovalov , aneesh.kumar@linux.ibm.com, anthony.yznaga@oracle.com, Ard Biesheuvel , Arnd Bergmann , arunks@codeaurora.org, Ben Hutchings , Sebastian Andrzej Siewior , Borislav Petkov , brgl@bgdev.pl, Catalin Marinas , Jonathan Corbet , cpandya@codeaurora.org, Daniel Vetter , Dan Williams , Greg KH , Roman Gushchin , Johannes Weiner , "H. Peter Anvin" , Joonsoo Kim , James Morse , Jann Horn , Juergen Gross , Jiri Kosina , James Morris , Joe Perches , Souptick Joarder , Joerg Roedel , Keith Busch , Konstantin Khlebnikov , Logan Gunthorpe , marco.antonio.780@gmail.com, Mark Rutland , Mel Gorman , Michal Hocko , Michal Hocko , Mike Kravetz , Ingo Molnar , "Michael S. Tsirkin" , Marek Szyprowski , Nicholas Piggin , osalvador@suse.de, "Paul E. McKenney" , pavel.tatashin@microsoft.com, Randy Dunlap , richard.weiyang@gmail.com, Rik van Riel , David Rientjes , Robin Murphy , Steven Rostedt , Mike Rapoport , Sai Praneeth Prakhya , "Serge E. Hallyn" , Steve Capper , thymovanbeers@gmail.com, Vlastimil Babka , Will Deacon , Matthew Wilcox , yaojun8558363@gmail.com, Huang Ying , zhangshaokun@hisilicon.com, iommu@lists.linux-foundation.org, X86 ML , linux-arm-kernel , LKML , Linux-MM , LSM List , Khalid Aziz References: <4495dda4bfc4a06b3312cc4063915b306ecfaecb.1554248002.git.khalid.aziz@oracle.com> <91f1dbce-332e-25d1-15f6-0e9cfc8b797b@oracle.com> <26b00051-b03c-9fce-1446-52f0d6ed52f8@intel.com> <36b999d4-adf6-08a3-2897-d77b9cba20f8@intel.com> From: Khalid Aziz Organization: Oracle Corp Message-ID: <9a1dcf02-a737-33c2-fee4-f475069e731f@oracle.com> Date: Fri, 5 Apr 2019 11:35:22 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9218 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904050118 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9218 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904050118 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: On 4/5/19 10:27 AM, Andy Lutomirski wrote: > At the risk of asking stupid questions: we already have a mechanism for= this: highmem. Can we enable highmem on x86_64, maybe with some heurist= ics to make it work well? >=20 I proposed using highmem infrastructure for xpfo in my cover letter as well as in my earlier replies discussing redesigning xpfo_kmap/xpfo_kunmap. So that sounds like a reasonable question to me :) Looks like we might be getting to an agreement that highmem infrastructure is a good thing to use here. -- Khalid